National Hurricane Center (NHC) Atlantic Map

Storm Surge Watch/Warning Map last updated Mon, 13 Sep 2021 14:37:31 GMT

5-Day Uncertainty Track last updated Mon, 13 Sep 2021 14:37:22 GMT


Wind Speed Probabilities last updated Mon, 13 Sep 2021 14:37:22 GMT

Issued at 1000 AM CDT Mon Sep 13 2021 000 WTNT44 KNHC 131436 TCDAT4 Tropical Storm Nicholas Discussion Number 6 NWS National Hurricane Center Miami FL AL142021 1000 AM CDT Mon Sep 13 2021 Doppler radar data from Brownsville and Corpus Christi, Texas, along with reconnaissance aircraft flight-level wind data, indicate that Nicholas' inner-core structure has undergone some radical changes since the previous advisory. The earlier near-eyewall pattern dissipated a few hours ago, and has been replaced with what appears to be an ongoing reformation of a new center abut 90 nmi north-northeast of the old center. The aircraft recently found a pressure of 1000 to 1002 mb with the dissipating original center, while Doppler radar velocity data show a pronounced mid- to upper-level circulation forming farther north as previously mentioned. The Air Force Reserve Hurricane Hunter aircraft is going to be concentrating its reconnoiter mission in Nicholas' northeastern quadrant to see if reformation of the low-level center is occurring beneath the mid-level circulation noted in radar data. The initial wind speed remains 50 kt based on recent aircraft 850-mb flight-level winds of 59 kt, which equates to about 47 kt equivalent surface winds. The initial motion is an uncertain 005/10 kt due to the erosion and ongoing reformation of the center. Despite the recent inner-core erosion, the latest NHC model guidance remains in fairly good agreement on Nicholas moving northward through a weakness in the subtropical ridge. The GFS model has been performing exceptionally well with predicting the recent erosion and more northward reformation of the Nicholas' center. The new NHC track forecast is similar to but slightly east or right of the previous advisory track, and lies along the eastern edge of the track consensus model envelope, which is to the left of the GFS track prediction. Although the inner-core convective pattern has been disrupted, recent trends in the radar data suggest that a new center should reform farther northeast into the convective cloud shield. The latest GFS- and ECMWF-based SHIPS shear analyses indicate that westerly shear of near 20 kt is allegedly affecting Nicholas. However, water vapor satellite imagery suggests that the upper-level shear vector is actually from a south-southwesterly direction, which is more along than across the cyclone's forward motion, thus reducing the magnitude and negative effects of the vertical wind shear. Therefore, strengthening is still expected until landfall as Nicholas continues to move over slightly warmer Gulf waters. It is possible that Nicholas could become a hurricane just before landfall, and that's the reason for the northeastward extension of the hurricane watch area. Nicholas should rapidly weaken after landfall due to increased frictional effects, strong southwesterly shear, and entrainment of mid-level dry air, resulting in degeneration into a tropical depression by late Tuesday and a remnant low on Wednesday. Otherwise, no significant changes were made to the previous advisory intensity forecast. Key Messages: 1. Heavy rainfall will impact portions of the Texas and Louisiana coasts through the middle of the week. Significant rainfall amounts are possible, potentially resulting in areas of life-threatening flash and urban flooding, especially in highly urbanized metropolitan areas. Minor to isolated moderate river flooding is also expected. 2. There is the danger of life-threatening storm surge inundation along the coast of Texas from Port Aransas to Sabine Pass. Residents in these areas should follow any advice given by local officials. 3. Nicholas is forecast to approach the middle Texas coast as a strong tropical storm by this evening, and could be near hurricane intensity at landfall. Tropical storm conditions are expected along portions of the middle Texas coast beginning this afternoon, with hurricane conditions possible from Port Aransas to San Luis Pass by late afternoon through tonight. 4. Tropical storm conditions are expected along portions of the coast of south Texas into the afternoon. FORECAST POSITIONS AND MAX WINDS INIT 13/1500Z 26.4N 96.8W 50 KT 60 MPH 12H 14/0000Z 27.5N 96.7W 60 KT 70 MPH 24H 14/1200Z 29.1N 96.3W 45 KT 50 MPH...INLAND 36H 15/0000Z 30.2N 95.4W 30 KT 35 MPH...INLAND 48H 15/1200Z 31.0N 94.0W 25 KT 30 MPH...INLAND 60H 16/0000Z 31.5N 92.5W 20 KT 25 MPH...INLAND 72H 16/1200Z 32.0N 91.1W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 17/1200Z...DISSIPATED $$ Forecaster Stewart

Issued at 1500 UTC MON SEP 13 2021 000 FONT14 KNHC 131435 PWSAT4 TROPICAL STORM NICHOLAS WIND SPEED PROBABILITIES NUMBER 6 NWS NATIONAL HURRICANE CENTER MIAMI FL AL142021 1500 UTC MON SEP 13 2021 AT 1500Z THE CENTER OF TROPICAL STORM NICHOLAS WAS LOCATED NEAR LATITUDE 26.4 NORTH...LONGITUDE 96.8 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 50 KTS...60 MPH...95 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 12Z MON AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 12Z MON 00Z TUE 12Z TUE 00Z WED 12Z WED 12Z THU 12Z FRI PERIODS TO TO TO TO TO TO TO 00Z TUE 12Z TUE 00Z WED 12Z WED 12Z THU 12Z FRI 12Z SAT FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT JACKSON MS 34 X X( X) X( X) 1( 1) 2( 3) X( 3) X( 3) NEW ORLEANS LA 34 X X( X) 1( 1) X( 1) 2( 3) X( 3) X( 3) GFMX 280N 910W 34 1 2( 3) 1( 4) X( 4) 1( 5) X( 5) X( 5) BATON ROUGE LA 34 X 1( 1) 1( 2) 1( 3) 2( 5) X( 5) X( 5) MORGAN CITY LA 34 X 2( 2) 1( 3) 1( 4) 1( 5) X( 5) X( 5) ALEXANDRIA LA 34 X 3( 3) 1( 4) 3( 7) 3(10) X(10) X(10) LAFAYETTE LA 34 X 4( 4) X( 4) 2( 6) 2( 8) X( 8) X( 8) NEW IBERIA LA 34 X 4( 4) X( 4) 2( 6) 1( 7) X( 7) X( 7) GFMX 280N 930W 34 4 5( 9) 1(10) 1(11) 1(12) X(12) X(12) SHREVEPORT LA 34 X 2( 2) 1( 3) 1( 4) 2( 6) X( 6) X( 6) FORT POLK LA 34 X 5( 5) 2( 7) 5(12) 1(13) X(13) X(13) LAKE CHARLES 34 1 6( 7) 3(10) 3(13) 1(14) X(14) X(14) CAMERON LA 34 3 8(11) 4(15) 2(17) 1(18) X(18) X(18) JASPER TX 34 1 7( 8) 6(14) 3(17) 1(18) X(18) X(18) KOUNTZE TX 34 1 12(13) 9(22) 3(25) 1(26) X(26) X(26) PORT ARTHUR TX 34 1 12(13) 7(20) 3(23) 1(24) X(24) X(24) GALVESTON TX 34 14 30(44) 4(48) X(48) X(48) X(48) X(48) GALVESTON TX 50 X 3( 3) 3( 6) X( 6) X( 6) X( 6) X( 6) HOUSTON TX 34 2 42(44) 10(54) 1(55) X(55) X(55) X(55) HOUSTON TX 50 X 4( 4) 3( 7) X( 7) X( 7) X( 7) X( 7) AUSTIN TX 34 1 4( 5) 1( 6) X( 6) X( 6) X( 6) X( 6) SAN ANTONIO TX 34 1 3( 4) X( 4) 1( 5) X( 5) X( 5) X( 5) FREEPORT TX 34 13 54(67) 2(69) X(69) X(69) X(69) X(69) FREEPORT TX 50 X 7( 7) 1( 8) X( 8) X( 8) X( 8) X( 8) FREEPORT TX 64 X 1( 1) X( 1) X( 1) X( 1) X( 1) X( 1) GFMX 280N 950W 34 58 6(64) 1(65) X(65) X(65) X(65) X(65) GFMX 280N 950W 50 2 3( 5) X( 5) X( 5) X( 5) X( 5) X( 5) HIGH ISLAND TX 34 2 20(22) 8(30) 1(31) 1(32) X(32) X(32) MATAGORDA TX 34 61 26(87) 1(88) X(88) X(88) X(88) X(88) MATAGORDA TX 50 2 28(30) 1(31) X(31) X(31) X(31) X(31) MATAGORDA TX 64 X 3( 3) X( 3) X( 3) X( 3) X( 3) X( 3) PORT O CONNOR 34 75 15(90) X(90) X(90) X(90) X(90) X(90) PORT O CONNOR 50 12 36(48) 1(49) X(49) X(49) X(49) X(49) PORT O CONNOR 64 X 5( 5) X( 5) X( 5) X( 5) X( 5) X( 5) ROCKPORT TX 34 42 12(54) X(54) X(54) X(54) X(54) X(54) ROCKPORT TX 50 6 11(17) X(17) X(17) X(17) X(17) X(17) CORPUS CHRISTI 34 13 10(23) 1(24) X(24) X(24) X(24) X(24) CORPUS CHRISTI 50 1 5( 6) X( 6) X( 6) X( 6) X( 6) X( 6) GFMX 270N 960W 34 97 X(97) X(97) X(97) X(97) X(97) X(97) GFMX 270N 960W 50 14 1(15) X(15) X(15) X(15) X(15) X(15) MCALLEN TX 34 1 2( 3) X( 3) X( 3) X( 3) X( 3) X( 3) HARLINGEN TX 34 1 3( 4) X( 4) X( 4) X( 4) X( 4) X( 4) BROWNSVILLE TX 34 2 3( 5) X( 5) X( 5) X( 5) X( 5) X( 5) GFMX 250N 960W 34 99 X(99) X(99) X(99) X(99) X(99) X(99) $$ FORECASTER STEWART

Issued at 1000 AM CDT Mon Sep 13 2021 000 WTNT34 KNHC 131435 TCPAT4 BULLETIN Tropical Storm Nicholas Advisory Number 6 NWS National Hurricane Center Miami FL AL142021 1000 AM CDT Mon Sep 13 2021 ...NICHOLAS MOVING ERRATICALLY NORTHWARD JUST OFFSHORE THE SOUTHERN COAST OF TEXAS... ...FLASH FLOODING, DANGEROUS STORM SURGE, AND GUSTY WINDS EXPECTED ALONG PORTIONS OF THE SOUTHERN AND MIDDLE TEXAS COASTS TODAY... SUMMARY OF 1000 AM CDT...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...26.4N 96.8W ABOUT 45 MI...70 KM NE OF MOUTH OF THE RIO GRANDE ABOUT 140 MI...225 KM S OF PORT OCONNOR TEXAS MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...N OR 5 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...1002 MB...29.59 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Storm Surge Warning has been extended from San Luis Pass to Sabine Pass including Galveston Bay. The Hurricane Watch has been extended northeastward to San Luis Pass, Texas. The Tropical Storm Warning has been extended eastward to Sabine Pass. The Storm Surge Watch from the Mouth of the Rio Grande to Baffin Bay has been discontinued. The government of Mexico has discontinued the Tropical Storm Warning from Barra el Mezquital to the U.S./Mexico border. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Port Aransas Texas to Sabine Pass * Galveston Bay, Aransas Bay, San Antonio Bay, and Matagorda Bay A Hurricane Watch is in effect for... * Port Aransas to San Luis Pass Texas A Tropical Storm Warning is in effect for... * Mouth of the Rio Grande to Sabine Pass A Storm Surge Watch is in effect for... * Baffin Bay to Port Aransas Texas * Sabine Pass to Rutherford Beach Louisiana * Corpus Christi Bay A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 36 hours in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. This is a life-threatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area. A Storm Surge Watch means there is a possibility of life-threatening inundation, from rising water moving inland from the coastline, in the indicated locations during the next 48 hours. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. A Hurricane Watch means that hurricane conditions are possible within the watch area. Interests elsewhere in southwestern Louisiana should monitor the progress of Nicholas. For storm information specific to your area in the United States, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. For storm information specific to your area outside of the United States, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 1000 AM CDT (1500 UTC), the center of Tropical Storm Nicholas was located by NOAA Doppler weather radars and an Air Force Reserve reconnaissance aircraft near latitude 26.4 North, longitude 96.8 West. Nicholas is moving toward the north near 12 mph (19 km/h) and this general motion is expected to continue today, followed by a turn toward the north-northeast on Tuesday. On the forecast track, the center of Nicholas will pass near or just offshore of the coast of south Texas this morning and move onshore along the coast of south or central Texas late this afternoon or this evening. Data from the reconnaissance aircraft indicate that maximum sustained winds remain near 60 mph (95 km/h) with higher gusts. Strengthening is forecast today, and Nicholas could reach the northwest Gulf coast as a hurricane. Weakening is anticipated on Tuesday and Wednesday while Nicholas moves over land. Tropical-storm-force winds extend outward up to 115 miles (185 km) from the center. NOAA buoy 42020 located southeast of Corpus Christi, Texas, recently reported a sustained wind of 40 mph (65 km/h). The minimum central pressure recently measured by the aircraft is 1002 mb (29.59 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Nicholas can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC and on the web at hurricanes.gov/graphics_at4.shtml?key_messages RAINFALL: Nicholas is expected to produce storm total rainfall of 8 to 16 inches, with isolated maximum amounts of 20 inches, across portions of the middle and upper Texas coastal areas through the middle of the week. Life-threatening, flash and urban flooding impacts are possible, especially across portions of the upper Texas Gulf Coast near Lake Jackson and Freeport, TX Across the rest of southeast Texas into southwest Louisiana rainfall of 5 to 10 inches is expected. This rainfall may produce areas of considerable flash and urban flooding, especially in highly urbanized metropolitan areas. Additionally, there is the potential for isolated minor to moderate river flooding. STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide... Port O'Connor to San Luis Pass TX including Matagorda Bay...3-5 ft San Luis Pass, TX to Rutherford Beach, LA including Galveston Bay...2-4 ft Baffin Bay to Port O'Connor, TX...2-4 ft Corpus Christi Bay, Aransas Bay and San Antonio Bay...2-4 ft Mouth of the Rio Grande to Baffin Bay...1-3 ft Rutherford Beach, LA to Intracoastal City, LA...1-3 ft Sabine Lake and Calcasieu Lake...1-3 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and dangerous waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. WIND: Tropical storm conditions are expected within the warning area in southern Texas through the next few hours. These conditions will spread northward within the warning area through tonight, making outside preparations difficult or dangerous. Hurricane conditions are possible in the Hurricane Watch area as early as this afternoon or this evening. TORNADOES: A couple of tornadoes are possible this afternoon and tonight across the middle and upper Texas coast. SURF: Swells generated by Nicholas will continue affecting portions of the northwest Gulf coast through Tuesday. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next intermediate advisory at 100 PM CDT. Next complete advisory at 400 PM CDT. $$ Forecaster Stewart

...NICHOLAS MOVING ERRATICALLY NORTHWARD JUST OFFSHORE THE SOUTHERN COAST OF TEXAS... ...FLASH FLOODING, DANGEROUS STORM SURGE, AND GUSTY WINDS EXPECTED ALONG PORTIONS OF THE SOUTHERN AND MIDDLE TEXAS COASTS TODAY... As of 10:00 AM CDT Mon Sep 13 the center of Nicholas was located near 26.4, -96.8 with movement N at 12 mph. The minimum central pressure was 1002 mb with maximum sustained winds of about 60 mph.

Issued at 1500 UTC MON SEP 13 2021 000 WTNT24 KNHC 131435 TCMAT4 TROPICAL STORM NICHOLAS FORECAST/ADVISORY NUMBER 6 NWS NATIONAL HURRICANE CENTER MIAMI FL AL142021 1500 UTC MON SEP 13 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE STORM SURGE WARNING HAS BEEN EXTENDED FROM SAN LUIS PASS TO SABINE PASS...INCLUDING GALVESTON BAY. THE HURRICANE WATCH HAS BEEN EXTENDED NORTHEASTWARD TO SAN LUIS PASS TEXAS. THE TROPICAL STORM WARNING HAS BEEN EXTENDED EASTWARD TO SABINE PASS. THE STORM SURGE WATCH FROM THE MOUTH OF THE RIO GRANDE TO BAFFIN BAY HAS BEEN DISCONTINUED. THE GOVERNMENT OF MEXICO HAS DISCONTINUED THE TROPICAL STORM WARNING FROM BARRA EL MEZQUITAL TO THE U.S./MEXICO BORDER. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A STORM SURGE WARNING IS IN EFFECT FOR... * PORT ARANSAS TEXAS TO SABINE PASS * GALVESTON BAY...ARANSAS BAY...SAN ANTONIO BAY...AND MATAGORDA BAY A HURRICANE WATCH IS IN EFFECT FOR... * PORT ARANSAS TO SAN LUIS PASS TEXAS A TROPICAL STORM WARNING IS IN EFFECT FOR... * MOUTH OF THE RIO GRANDE TO SABINE PASS A STORM SURGE WATCH IS IN EFFECT FOR... * BAFFIN BAY TO PORT ARANSAS TEXAS * SABINE PASS TO RUTHERFORD BEACH LOUISIANA * CORPUS CHRISTI BAY A STORM SURGE WARNING MEANS THERE IS A DANGER OF LIFE-THREATENING INUNDATION...FROM RISING WATER MOVING INLAND FROM THE COASTLINE...DURING THE NEXT 36 HOURS IN THE INDICATED LOCATIONS. FOR A DEPICTION OF AREAS AT RISK...PLEASE SEE THE NATIONAL WEATHER SERVICE STORM SURGE WATCH/WARNING GRAPHIC...AVAILABLE AT HURRICANES.GOV. THIS IS A LIFE-THREATENING SITUATION. PERSONS LOCATED WITHIN THESE AREAS SHOULD TAKE ALL NECESSARY ACTIONS TO PROTECT LIFE AND PROPERTY FROM RISING WATER AND THE POTENTIAL FOR OTHER DANGEROUS CONDITIONS. PROMPTLY FOLLOW EVACUATION AND OTHER INSTRUCTIONS FROM LOCAL OFFICIALS. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA. A STORM SURGE WATCH MEANS THERE IS A POSSIBILITY OF LIFE-THREATENING INUNDATION...FROM RISING WATER MOVING INLAND FROM THE COASTLINE...IN THE INDICATED LOCATIONS DURING THE NEXT 48 HOURS. FOR A DEPICTION OF AREAS AT RISK...PLEASE SEE THE NATIONAL WEATHER SERVICE STORM SURGE WATCH/WARNING GRAPHIC...AVAILABLE AT HURRICANES.GOV. A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA. INTERESTS ELSEWHERE IN SOUTHWESTERN LOUISIANA SHOULD MONITOR THE PROGRESS OF NICHOLAS. TROPICAL STORM CENTER LOCATED NEAR 26.4N 96.8W AT 13/1500Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH OR 5 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1002 MB MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT. 50 KT....... 30NE 0SE 0SW 0NW. 34 KT.......100NE 80SE 0SW 0NW. 12 FT SEAS.. 60NE 30SE 0SW 0NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 26.4N 96.8W AT 13/1500Z AT 13/1200Z CENTER WAS LOCATED NEAR 25.4N 96.9W FORECAST VALID 14/0000Z 27.5N 96.7W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 50NE 20SE 0SW 0NW. 34 KT...120NE 100SE 30SW 30NW. FORECAST VALID 14/1200Z 29.1N 96.3W...INLAND MAX WIND 45 KT...GUSTS 55 KT. 34 KT...100NE 100SE 20SW 20NW. FORECAST VALID 15/0000Z 30.2N 95.4W...INLAND MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 15/1200Z 31.0N 94.0W...INLAND MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 16/0000Z 31.5N 92.5W...INLAND MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 16/1200Z 32.0N 91.1W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 17/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 26.4N 96.8W INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 13/1800Z NEXT ADVISORY AT 13/2100Z $$ FORECASTER STEWART

000
ABNT20 KNHC 131119
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Mon Sep 13 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on Tropical
Storm Nicholas, located over the western Gulf of Mexico.

A tropical wave has emerged off the west coast of Africa near
the coasts of Guinea and Sierra Leone. Environmental conditions
are forecast to be conducive for gradual development of this
disturbance, and a tropical depression is likely to form by late
this week while the system moves westward at 10 to 15 mph across
the eastern tropical Atlantic Ocean.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 5 days...high...80 percent.

An area of low pressure is forecast to form by midweek a couple of
hundred miles north of the southeastern or central Bahamas as a
tropical wave interacts with an upper-level trough. Some gradual
development of this system is possible thereafter, and a tropical
depression could form later this week while the system moves
north-northwestward or northward across the western Atlantic.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...medium...50 percent.

&&
Public Advisories on Tropical Storm Nicholas are issued under
WMO header WTNT34 KNHC and under AWIPS header MIATCPAT4.
Forecast/Advisories on Tropical Storm Nicholas are issued under
WMO header WTNT24 KNHC and under AWIPS header MIATCMAT4.

$$
Forecaster Stewart

Potential Storm Surge Flooding Map last updated Mon, 13 Sep 2021 09:56:45 GMT

5-Day Uncertainty Track last updated Fri, 10 Sep 2021 14:50:03 GMT


Wind Speed Probabilities last updated Fri, 10 Sep 2021 15:22:52 GMT

Issued at 1100 AM AST Fri Sep 10 2021 000 WTNT42 KNHC 101448 TCDAT2 Hurricane Larry Discussion Number 40 NWS National Hurricane Center Miami FL AL122021 1100 AM AST Fri Sep 10 2021 Larry remains a well organized hurricane at a high latitude, and it is quickly approaching southeastern Newfoundland. Satellite images show a fairly tight inner core and large curved bands surrounding that feature. However, there are some notable dry slots between the core and bands that have developed during the past several hours. The latest Dvorak numbers have nudged downward, with the CI values ranging between 65 kt and 72 kt. Based on these estimates, and a very recent ASCAT pass that showed peak winds near 65 kt, the initial intensity is set at 70 kt for this advisory. The cyclone remains quite large, with hurricane-force winds and tropical-storm-force winds estimated to extend outward up to 80 and 210 n mi from the center, respectively. The hurricane is in the process of turning to the right, with the latest initial motion estimated to be a fairly quick 015/25 kt. An even faster north-northeast to northeast motion is expected during the next day or two as the hurricane moves in the fast flow between a mid- to upper-level trough over the northeastern U.S./eastern Canada and a mid-level ridge over the central Atlantic. This motion should take Larry across southeastern Newfoundland tonight. Larry is then expected to merge with a large extratropical low over the Labrador Sea on Sunday. The NHC track forecast is similar to the previous one and near the middle of the guidance envelope. Although Larry will be moving over cooler waters north of the Gulf Stream Current later today, the hurricane will likely hold its strength or weaken just a little before landfall. After landfall, the models show the inner core dissipating, and the combination of land interaction, cooler waters, and an increase in shear should cause weakening and lead to extratropical transition by early Saturday. The NHC intensity forecast is close to the GFS model, which often performs well for hurricanes that transition to extratropical cyclones. Key Messages: 1. Larry is forecast to move over portions of southeastern Newfoundland tonight as it undergoes transition to a hurricane-force post-tropical cyclone. Hurricane conditions, a dangerous storm surge, and heavy rainfall are expected in portions of southeastern Newfoundland where a Hurricane Warning in effect. 2. Large swells generated by Larry will continue to affect the Bahamas, Bermuda, and the east coast of the United States and Atlantic Canada through Saturday night. These swells will cause life-threatening surf and rip current conditions, and beachgoers and other interests along these coasts are urged to follow the guidance of lifeguards and local officials. FORECAST POSITIONS AND MAX WINDS INIT 10/1500Z 40.0N 60.5W 70 KT 80 MPH 12H 11/0000Z 45.1N 56.4W 70 KT 80 MPH 24H 11/1200Z 52.0N 49.4W 60 KT 70 MPH...POST-TROP/EXTRATROP 36H 12/0000Z 57.5N 44.0W 60 KT 70 MPH...POST-TROP/EXTRATROP 48H 12/1200Z 61.1N 38.7W 55 KT 65 MPH...POST-TROP/EXTRATROP 60H 13/0000Z...DISSIPATED $$ Forecaster Cangialosi

Issued at 1500 UTC FRI SEP 10 2021 287 FONT12 KNHC 101447 PWSAT2 HURRICANE LARRY WIND SPEED PROBABILITIES NUMBER 40 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 1500 UTC FRI SEP 10 2021 AT 1500Z THE CENTER OF HURRICANE LARRY WAS LOCATED NEAR LATITUDE 40.0 NORTH...LONGITUDE 60.5 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 70 KTS...80 MPH...130 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 12Z FRI AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 12Z FRI 00Z SAT 12Z SAT 00Z SUN 12Z SUN 12Z MON 12Z TUE PERIODS TO TO TO TO TO TO TO 00Z SAT 12Z SAT 00Z SUN 12Z SUN 12Z MON 12Z TUE 12Z WED FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT HIBERNIA OILFD 34 X 36(36) X(36) X(36) X(36) X(36) X(36) CAPE RACE NFLD 34 58 37(95) X(95) X(95) X(95) X(95) X(95) CAPE RACE NFLD 50 1 85(86) X(86) X(86) X(86) X(86) X(86) CAPE RACE NFLD 64 X 26(26) X(26) X(26) X(26) X(26) X(26) ILE ST PIERRE 34 83 15(98) X(98) X(98) X(98) X(98) X(98) ILE ST PIERRE 50 21 53(74) X(74) X(74) X(74) X(74) X(74) ILE ST PIERRE 64 3 17(20) X(20) X(20) X(20) X(20) X(20) BURGEO NFLD 34 32 19(51) X(51) X(51) X(51) X(51) X(51) PTX BASQUES 34 8 6(14) X(14) X(14) X(14) X(14) X(14) EDDY POINT NS 34 3 X( 3) X( 3) X( 3) X( 3) X( 3) X( 3) SYDNEY NS 34 18 2(20) X(20) X(20) X(20) X(20) X(20) SABLE ISLAND 34 78 X(78) X(78) X(78) X(78) X(78) X(78) SABLE ISLAND 50 4 X( 4) X( 4) X( 4) X( 4) X( 4) X( 4) HALIFAX NS 34 3 X( 3) X( 3) X( 3) X( 3) X( 3) X( 3) $$ FORECASTER CANGIALOSI

Issued at 1500 UTC FRI SEP 10 2021 000 WTNT22 KNHC 101447 TCMAT2 HURRICANE LARRY FORECAST/ADVISORY NUMBER 40 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 1500 UTC FRI SEP 10 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A HURRICANE WARNING IS IN EFFECT FOR... * SOUTHEASTERN NEWFOUNDLAND FROM ARNOLD'S COVE TO JONES HARBOUR A TROPICAL STORM WARNING IS IN EFFECT FOR... * SOUTHEASTERN NEWFOUNDLAND FROM FRANCOIS TO WEST OF ARNOLD'S COVE * SOUTHEASTERN NEWFOUNDLAND FROM NORTH OF JONES HARBOR TO FOGO ISLAND A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA...IN THIS CASE WITHIN THE NEXT 24 HOURS. PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO COMPLETION. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA...IN THIS CASE WITHIN THE NEXT 12 HOURS. INTERESTS ELSEWHERE IN SOUTHEASTERN NEWFOUNDLAND SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. HURRICANE CENTER LOCATED NEAR 40.0N 60.5W AT 10/1500Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR 15 DEGREES AT 25 KT ESTIMATED MINIMUM CENTRAL PRESSURE 971 MB MAX SUSTAINED WINDS 70 KT WITH GUSTS TO 85 KT. 64 KT....... 80NE 60SE 50SW 50NW. 50 KT.......120NE 120SE 90SW 90NW. 34 KT.......210NE 210SE 180SW 140NW. 12 FT SEAS..300NE 350SE 280SW 340NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 40.0N 60.5W AT 10/1500Z AT 10/1200Z CENTER WAS LOCATED NEAR 39.0N 61.0W FORECAST VALID 11/0000Z 45.1N 56.4W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 80NE 80SE 50SW 40NW. 50 KT...120NE 140SE 100SW 70NW. 34 KT...210NE 230SE 210SW 120NW. FORECAST VALID 11/1200Z 52.0N 49.4W...POST-TROP/EXTRATROP MAX WIND 60 KT...GUSTS 75 KT. 50 KT...120NE 140SE 100SW 70NW. 34 KT...210NE 250SE 240SW 120NW. FORECAST VALID 12/0000Z 57.5N 44.0W...POST-TROP/EXTRATROP MAX WIND 60 KT...GUSTS 75 KT. 50 KT...120NE 140SE 100SW 60NW. 34 KT...300NE 330SE 330SW 150NW. FORECAST VALID 12/1200Z 61.1N 38.7W...POST-TROP/EXTRATROP MAX WIND 55 KT...GUSTS 65 KT. 50 KT...200NE 200SE 120SW 0NW. 34 KT...420NE 420SE 480SW 180NW. FORECAST VALID 13/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 40.0N 60.5W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 10/1800Z NEXT ADVISORY AT 10/2100Z $$ FORECASTER CANGIALOSI

Issued at 1100 AM AST Fri Sep 10 2021 000 WTNT32 KNHC 101447 TCPAT2 BULLETIN Hurricane Larry Advisory Number 40 NWS National Hurricane Center Miami FL AL122021 1100 AM AST Fri Sep 10 2021 ...LARRY MOVING QUICKLY TOWARD SOUTHEASTERN NEWFOUNDLAND... ...EXPECTED TO BRING HURRICANE-FORCE WINDS, A DANGEROUS STORM SURGE, AND HEAVY RAINFALL TO THAT AREA TONIGHT... SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...40.0N 60.5W ABOUT 595 MI...955 KM SW OF CAPE RACE NEWFOUNDLAND MAXIMUM SUSTAINED WINDS...80 MPH...130 KM/H PRESENT MOVEMENT...NNE OR 15 DEGREES AT 29 MPH...46 KM/H MINIMUM CENTRAL PRESSURE...971 MB...28.68 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Southeastern Newfoundland from Arnold's Cove to Jones Harbour A Tropical Storm Warning is in effect for... * Southeastern Newfoundland from Francois to west of Arnold's Cove * Southeastern Newfoundland from north of Jones Harbor to Fogo Island A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area, in this case within the next 24 hours. Preparations to protect life and property should be rushed to completion. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within the next 12 hours. Interests elsewhere in southeastern Newfoundland should monitor the progress of this system. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 1100 AM AST (1500 UTC), the center of Hurricane Larry was located near latitude 40.0 North, longitude 60.5 West. Larry is moving quickly toward the north-northeast near 29 mph (46 km/h). An even faster north-northeast to northeast motion is expected during the next day or two. On the forecast track, the center of Larry will pass well southeast of Nova Scotia today, and move over southeastern Newfoundland tonight. Maximum sustained winds are near 80 mph (130 km/h) with higher gusts. Little change in strength is expected before landfall in Newfoundland. After landfall, Larry should weaken and become an extratropical cyclone on Saturday before it merges with another low over the Labrador Sea on Sunday. Larry is a large tropical cyclone. Hurricane-force winds extend outward up to 90 miles (150 km) from the center and tropical-storm-force winds extend outward up to 240 miles (390 km). The estimated minimum central pressure is 971 mb (28.68 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Larry can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT2, WMO header WTNT42 KNHC and on the web at hurricanes.gov/graphics_at2.shtml?key_messages WIND: Hurricane conditions are expected within the hurricane warning area in southeastern Newfoundland tonight, with tropical storm conditions expected to begin this afternoon or evening. Tropical storm conditions are expected to begin in the tropical storm warning area in southeastern Newfoundland later today. STORM SURGE: A dangerous storm surge is expected to produce coastal flooding within the warning areas in southeastern Newfoundland. SURF: Swells generated by Larry will continue to affect the Bahamas today. Significant swells from Larry will continue affecting Bermuda, the east coast of the United States, and Atlantic Canada through Saturday night. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. RAINFALL: Heavy rains from Larry will move quickly across eastern Newfoundland tonight, producing 1 to 2 inches of rain. NEXT ADVISORY ------------- Next intermediate advisory at 200 PM AST. Next complete advisory at 500 PM AST. $$ Forecaster Cangialosi

...LARRY MOVING QUICKLY TOWARD SOUTHEASTERN NEWFOUNDLAND... ...EXPECTED TO BRING HURRICANE-FORCE WINDS, A DANGEROUS STORM SURGE, AND HEAVY RAINFALL TO THAT AREA TONIGHT... As of 11:00 AM AST Fri Sep 10 the center of Larry was located near 40.0, -60.5 with movement NNE at 29 mph. The minimum central pressure was 971 mb with maximum sustained winds of about 80 mph.

000
ABNT20 KNHC 101116
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Fri Sep 10 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on Hurricane
Larry, located over the western Atlantic several hundred miles
southwest of Newfoundland, Canada.

The northern portion of a tropical wave is producing disorganized
showers and thunderstorms over Honduras, the western Caribbean Sea,
and portions of the Yucatan peninsula. This system is forecast to
move into the Bay of Campeche and merge with a pre-existing surface
trough located over the southwestern Gulf of Mexico by this weekend.
Environmental conditions are expected to be conducive to support
gradual development, and a tropical depression is likely to form
Sunday or Monday before the system moves onshore along the western
Gulf of Mexico coast. Regardless of development, this disturbance
is expected to produce heavy rains across portions of Central
America through Saturday.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 5 days...high...70 percent.

A strong tropical wave is expected to emerge off of the west coast
of Africa by tonight. Environmental conditions are forecast to be
conducive for gradual development thereafter, and a tropical
depression is likely to form late this weekend or early next week as
the system moves west-northwestward over the far eastern Atlantic
near the Cabo Verde Islands. Interests in the Cabo Verde Islands
should monitor the progress of this system.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 5 days...high...70 percent.

$$
Forecaster Cangialosi

743
ABNT20 KNHC 011143
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Wed Sep 1 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on Tropical
Depression Kate, located over the central Atlantic and on recently
upgraded Tropical Storm Larry, located over the far eastern tropical
Atlantic several hundred miles southwest of the Cabo Verde Islands.

The Weather Prediction Center is issuing Public Advisories on
Tropical Depression Ida, located over the central Appalachian
mountains in West Virginia.

An area of low pressure continues to produce disorganized shower
activity over the southwestern Caribbean Sea. Some slow development
of this system remains possible over the next couple of days if it
remains over open water while moving west-northwestward or
northwestward at 5 to 10 mph near the coast of Central America.
Thereafter, the system will have another opportunity for gradual
development in the southwestern Gulf of Mexico. Regardless of
development, heavy rains are possible across portions of Central
America and the Yucatan Peninsula later this week into the weekend.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 5 days...low...30 percent.

&&
Public advisories issued by the Weather Prediction Center on
Tropical Depression Ida can be found under AWIPS header TCPAT4, WMO
header WTNT34 KWNH, and on the web at http://www.wpc.ncep.noaa.gov

Public Advisories on Tropical Storm Larry are issued under
WMO header WTNT32 KNHC and under AWIPS header MIATCPAT2.
Forecast/Advisories on Tropical Storm Larry are issued under
WMO header WTNT22 KNHC and under AWIPS header MIATCMAT2.

$$
Forecaster Papin

5-Day Uncertainty Track last updated Wed, 01 Sep 2021 09:00:20 GMT


Wind Speed Probabilities last updated Wed, 01 Sep 2021 09:34:36 GMT

Issued at 800 AM CVT Wed Sep 01 2021 000 WTNT42 KNHC 010858 TCDAT2 Tropical Storm Larry Discussion Number 3 NWS National Hurricane Center Miami FL AL122021 800 AM CVT Wed Sep 01 2021 Deep convection with cloud tops colder than -80C have increased over and to the west of the low-level center since the previous advisory. Subjective satellite intensity estimates at 0600 UTC from TAFB and SAB were T2.5/35 kt and T3.0/45 kt, while the most recent objective intensity estimates from UW-CIMSS are T2.8/41 kt from ADT and 37 kt from SATCON. An average of these intensity estimates support increasing the advisory intensity to 40 kt, making the cyclone Tropical Storm Larry. In addition, 0300 UTC and 0700 UTC observations from ship VRNF3, which recently passed through the center of Larry, reported a pressure of 1006.8 mb and winds near 25 kt. These data were the basis for the estimated central pressure of 1003 mb, a pressure value that also supports an intensity of 40 kt. Larry has turned more westward over the past several hours, and the new motion estimate is 280/17 kt. Larry is expected to move around the southern and southwestern periphery of the sprawling Bermuda-Azores ridge for the next 5 days, resulting in a general west motion for the next 36 hours or so, followed by a turn toward the west-northwest on Friday, and a northwestward motion over the weekend and continuing into early next week. There has been a pronounced westward shift in the track guidance for this cycle, with the greatest shift coming from the GFS model. Over the past 36 hours, the GFS has shifted its track westward by more than 500 nmi, and even the latest shift still keeps the GFS model the easternmost track forecast in the guidance suite. In contrast, the ECMWF and UKMET models, which lie along the westernmost portion of the guidance envelope, have been fairly stable. Owing to the westward shift in the overall guidance envelope, and considering the GFS solution as an outlier model, the new NHC forecast track has also been shifted westward, and lies between the NOAA-HCCA corrected-consensus model to the south, and the tightly packed TVCA simple-consensus model and FSSE corrected-consensus model to the north. Given the poor handling of the ridge to the north of Larry by the GFS, subsequent NHC forecast tracks may have to be shifted farther west. Given the improved inner-core wind field based on earlier ASCAT wind data and reports from ship VRNF3, along with warm sea-surface temperatures of 28 deg C and light easterly to southeasterly vertical shear of around 5 kt, steady strengthening is expected for the next 24 hours or so. By 36 hours when Larry is expected to be a hurricane and have a well-established and tighter inner-core wind field and possibly an eye, rapid intensification is forecast, with Larry becoming a major hurricane by 72 hour. This in large part due to the massive equatorward upper-level outflow pattern that all of the global and regional models are forecasting, which is the same type of outflow pattern that recently occurred with Hurricane Ida. The new official intensity forecast is above the previous advisory forecast by about 10 kt at all forecast times, and conservatively follows an average of the Decay-SHIPS, COAMPS-TC, FSSE, and ECMWF models. This intensity forecast is near the upper end of the guidance envelope and is above the other consensus intensity models. FORECAST POSITIONS AND MAX WINDS INIT 01/0900Z 12.3N 24.8W 40 KT 45 MPH 12H 01/1800Z 12.5N 27.5W 50 KT 60 MPH 24H 02/0600Z 12.6N 30.6W 60 KT 70 MPH 36H 02/1800Z 13.1N 33.7W 70 KT 80 MPH 48H 03/0600Z 13.6N 36.8W 85 KT 100 MPH 60H 03/1800Z 14.4N 39.7W 95 KT 110 MPH 72H 04/0600Z 15.5N 42.0W 100 KT 115 MPH 96H 05/0600Z 18.2N 46.9W 105 KT 120 MPH 120H 06/0600Z 21.3N 50.6W 105 KT 120 MPH $$ Forecaster Stewart

Issued at 0900 UTC WED SEP 01 2021 000 FONT12 KNHC 010842 PWSAT2 TROPICAL STORM LARRY WIND SPEED PROBABILITIES NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL122021 0900 UTC WED SEP 01 2021 AT 0900Z THE CENTER OF TROPICAL STORM LARRY WAS LOCATED NEAR LATITUDE 12.3 NORTH...LONGITUDE 24.8 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 40 KTS...45 MPH...75 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 06Z WED AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 06Z WED 18Z WED 06Z THU 18Z THU 06Z FRI 06Z SAT 06Z SUN PERIODS TO TO TO TO TO TO TO 18Z WED 06Z THU 18Z THU 06Z FRI 06Z SAT 06Z SUN 06Z MON FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER STEWART