Aggregator

Issued at 2100 UTC MON AUG 14 2023 000 FOPZ12 KNHC 142035 PWSEP2 HURRICANE FERNANDA WIND SPEED PROBABILITIES NUMBER 9 NWS NATIONAL HURRICANE CENTER MIAMI FL EP072023 2100 UTC MON AUG 14 2023 AT 2100Z THE CENTER OF HURRICANE FERNANDA WAS LOCATED NEAR LATITUDE 15.9 NORTH...LONGITUDE 119.0 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 115 KTS...130 MPH...215 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) PACIFIC DAYLIGHT TIME (PDT)...SUBTRACT 7 HOURS FROM Z TIME HAWAIIAN STANDARD TIME (HST)...SUBTRACT 10 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 18Z 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 18Z MON 06Z TUE 18Z TUE 06Z WED 18Z WED 18Z THU 18Z FRI PERIODS TO TO TO TO TO TO TO 06Z TUE 18Z TUE 06Z WED 18Z WED 18Z THU 18Z FRI 18Z SAT FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT 15N 120W 34 10 2(12) X(12) X(12) X(12) X(12) X(12) 20N 120W 34 X 2( 2) 1( 3) X( 3) X( 3) X( 3) X( 3) 15N 125W 34 X 2( 2) 8(10) 3(13) X(13) X(13) X(13) 20N 125W 34 X 2( 2) 12(14) 5(19) 1(20) X(20) X(20) 15N 130W 34 X X( X) 1( 1) 3( 4) 5( 9) X( 9) X( 9) 20N 130W 34 X X( X) 1( 1) 7( 8) 14(22) X(22) X(22) 20N 130W 50 X X( X) X( X) X( X) 3( 3) X( 3) X( 3) 15N 135W 34 X X( X) X( X) X( X) 2( 2) 1( 3) X( 3) 20N 135W 34 X X( X) X( X) X( X) 5( 5) 5(10) X(10) 20N 140W 34 X X( X) X( X) X( X) X( X) 2( 2) 2( 4) $$ FORECASTER PASCH

Issued at 1100 AM HST Mon Aug 14 2023 000 WTPZ32 KNHC 142035 TCPEP2 BULLETIN Hurricane Fernanda Advisory Number 9 NWS National Hurricane Center Miami FL EP072023 1100 AM HST Mon Aug 14 2023 ...FERNANDA MAINTAINING CATEGORY 4 INTENSITY... SUMMARY OF 1100 AM HST...2100 UTC...INFORMATION ----------------------------------------------- LOCATION...15.9N 119.0W ABOUT 765 MI...1230 KM SW OF THE SOUTHERN TIP OF BAJA CALIFORNIA MAXIMUM SUSTAINED WINDS...130 MPH...215 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 7 MPH...11 KM/H MINIMUM CENTRAL PRESSURE...955 MB...28.20 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 1100 AM HST (2100 UTC), the center of Hurricane Fernanda was located near latitude 15.9 North, longitude 119.0 West. Fernanda is moving toward the west near 7 mph (11 km/h). A general west to west-northwest motion is expected to continue with some increase in forward speed over the next few days. Maximum sustained winds are near 130 mph (215 km/h) with higher gusts. Fernanda is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Although a little more strengthening is possible later today, a weakening trend is likely to begin late tonight or early Tuesday. Hurricane-force winds extend outward up to 25 miles (35 km) from the center and tropical-storm-force winds extend outward up to 80 miles (130 km). The estimated minimum central pressure is 955 mb (28.20 inches). HAZARDS AFFECTING LAND ---------------------- None NEXT ADVISORY ------------- Next complete advisory at 500 PM HST. $$ Forecaster Pasch

...FERNANDA MAINTAINING CATEGORY 4 INTENSITY... As of 11:00 AM HST Mon Aug 14 the center of Fernanda was located near 15.9, -119.0 with movement W at 7 mph. The minimum central pressure was 955 mb with maximum sustained winds of about 130 mph.

Issued at 2100 UTC MON AUG 14 2023 000 WTPZ22 KNHC 142034 TCMEP2 HURRICANE FERNANDA FORECAST/ADVISORY NUMBER 9 NWS NATIONAL HURRICANE CENTER MIAMI FL EP072023 2100 UTC MON AUG 14 2023 NOTICE... LAND-BASED TROPICAL CYCLONE WATCHES AND WARNINGS ARE NO LONGER INCLUDED IN THE TROPICAL CYCLONE FORECAST/ADVISORY...(TCM). CURRENT LAND-BASED COASTAL WATCHES AND WARNINGS CAN BE FOUND IN THE MOST RECENTLY ISSUED TROPICAL CYCLONE PUBLIC ADVISORY...(TCP). HURRICANE CENTER LOCATED NEAR 15.9N 119.0W AT 14/2100Z POSITION ACCURATE WITHIN 15 NM PRESENT MOVEMENT TOWARD THE WEST OR 280 DEGREES AT 6 KT ESTIMATED MINIMUM CENTRAL PRESSURE 955 MB EYE DIAMETER 10 NM MAX SUSTAINED WINDS 115 KT WITH GUSTS TO 140 KT. 64 KT....... 20NE 15SE 10SW 20NW. 50 KT....... 40NE 30SE 20SW 40NW. 34 KT....... 70NE 50SE 50SW 70NW. 12 FT SEAS..150NE 90SE 90SW 120NW. 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 15.9N 119.0W AT 14/2100Z AT 14/1800Z CENTER WAS LOCATED NEAR 15.8N 118.7W FORECAST VALID 15/0600Z 16.5N 120.3W MAX WIND 120 KT...GUSTS 145 KT. 64 KT... 25NE 15SE 15SW 25NW. 50 KT... 40NE 30SE 30SW 40NW. 34 KT... 70NE 50SE 50SW 70NW. FORECAST VALID 15/1800Z 17.2N 122.4W MAX WIND 105 KT...GUSTS 130 KT. 64 KT... 25NE 15SE 15SW 25NW. 50 KT... 40NE 30SE 30SW 40NW. 34 KT... 70NE 50SE 50SW 70NW. FORECAST VALID 16/0600Z 17.5N 124.8W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 20NE 10SE 10SW 20NW. 50 KT... 40NE 30SE 20SW 40NW. 34 KT... 70NE 50SE 50SW 70NW. FORECAST VALID 16/1800Z 17.7N 127.5W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 20NE 10SE 10SW 20NW. 50 KT... 40NE 20SE 20SW 40NW. 34 KT... 60NE 40SE 40SW 60NW. FORECAST VALID 17/0600Z 17.9N 130.2W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 30NE 20SE 20SW 30NW. 34 KT... 50NE 30SE 30SW 50NW. FORECAST VALID 17/1800Z 18.0N 133.0W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 40NE 30SE 30SW 40NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 125 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 18/1800Z 18.0N 139.0W...POST-TROP/REMNT LOW MAX WIND 30 KT...GUSTS 40 KT. OUTLOOK VALID 19/1800Z 18.0N 145.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 15.9N 119.0W NEXT ADVISORY AT 15/0300Z $$ FORECASTER PASCH

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0232 PM CDT Mon Aug 14 2023 Valid 142000Z - 151200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE TENNESSEE VALLEY INTO THE MID-ATLANTIC... ...SUMMARY... Strong/locally severe thunderstorms are expected through this evening across portions of the Midwest, Kentucky and Tennessee, and extending eastward to the Mid-Atlantic Region. ...20z Update... The Marginal (level 1 of 5) risk has been expanded northwest across parts of eastern IA along the occluded surface front. While instability remains modest across this area, low-level vorticity is maximized along the boundary and beneath the cold core upper trough/low. 3 km MLCAPE is around 100-125 J/kg, though 0-1 km SRH is expected to remain modest. A couple of funnel clouds and/or a brief tornado will be possible the remainder of the afternoon with this activity. Some gusty winds or small hail also could accompany stronger cores. Reference MCD 1994 for more short term details. The Slight risk (level 2 of 5) as been removed from portions of northern KY into southern OH and southwest PA. Earlier day convection and persistent cloud cover has precluded much destabilization this afternoon. While some airmass recovery will continue into the evening in low-level warm advection ahead of the synoptic cold front, overall conditions appear only marginally favorable for isolated strong storms. Otherwise, modest adjustments have been made to the Marginal (level 1 of 5) risk across western KY/TN and northeast OH/western PA based on latest observed data and model forecast guidance. ..Leitman.. 08/14/2023 .PREV DISCUSSION... /ISSUED 1101 AM CDT Mon Aug 14 2023/ ...TN Valley into Mid-Atlantic... Morning water vapor loop shows an upper low moving from IA into northern IL, with a relatively strong mid/upper level jet max rotating into the lower OH and TN Valleys. Widespread remnant clouds from overnight storms cover much of the OH/TN Valleys into the central Appalachians, which is limiting heating/destabilization. Despite rather strong westerly flow aloft and ample low-level moisture, muted heating will keep any severe risk rather low/localized through mid-afternoon. Some intensification of this activity may occur as it spreads east of the mountains into parts of PA/VA/NC, where strong heating is occurring. But this scenario is also relatively low confidence. Later this afternoon and evening, slow clearing/heating will eventually likely result in a pocket of rather strong CAPE from parts of middle/east TN into southeast KY. This area is probably the highest confidence in at least widely scattered strong to severe storms as the cold front approaches. Forecast soundings show sufficient deep-layer shear for a few bowing structures capable of damaging wind gusts. Time-of-day would be a negative, but there is some risk of storms maintaining some intensity as they move into the mountains of WV/western VA/western NC tonight. ...PA/NJ after dark... Most 12z CAM solutions continue to indicate that low-level winds will intensify after dark over parts of eastern PA as a shortwave trough rotates into the area. Favorable low-level shear profiles suggest some risk of rotating cells and tornado or two, although weak lapse rates and time-of-day will be unfavorable for robust updrafts. ...Northern IL... An occluded surface front extends northwestward from central IN into northern IL. Persistent clouds are limited heating in this area, but a zone of low-level convergence/vorticity will be present through the afternoon. A few rotating storms cannot be ruled out by mid/late afternoon, with a non-zero risk of a tornado or hail. Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0217 PM CDT Mon Aug 14 2023 Valid 151200Z - 161200Z Minor modifications were made to the dry thunder area in the Northwest based on updated guidance. An area of dry conditions also appears probable in parts of central/eastern Texas behind the cold front. Winds however, will remain rather light at 10-15 mph which should mitigate some fire spread potential within the very dry fuels. ..Wendt.. 08/14/2023 .PREV DISCUSSION... /ISSUED 0156 AM CDT Mon Aug 14 2023/ ...Synopsis... Across the western US, mid-level ridging is forecast to intensify as a weak upper low moves offshore across western CA. Predominantly weak mid-level flow should keep winds light over much of the western US. Monsoon moisture drawn northward with the upper low may support showers and thunderstorms into parts of northern CA and southern OR. ...Northwest... As the upper low continues to move offshore, easterly mid-level flow will overspread northern CA and southern OR late D1/Mon into early D2/Tues. Showers, and a few thunderstorms, are possible through the early morning hours, and again with additional storms possible in the afternoon and evening. Storm coverage remains very uncertain with hi-res model guidance varying widely in the possible solutions. With weak elevated buoyancy and broad synoptic ascent from the passing low, isolated storms do appear possible. The dry low levels would also favor drier storms with the potential for lightning ignitions. Given the dry and receptive fuels, and at least some risk for lightning, an IsoDryT area has been added despite some uncertainty on storm coverage. ...Northern Rockies... A slight increase in mid-level flow from an approaching Alberta low will help bolster downslope surface winds over parts of northern MT late D2/Tues. Downslope gusts of 15-20 mph are possible, along with relatively low RH below 35%. The temporal overlap of dry and windy conditions will be limited by the arrival of the strongest winds overnight. However, a few hours of locally elevated conditions are possible given dry fuels. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

Fish, plants and other wildlife were threatened as water sources run low. Barton Springs Pool, for example, is home to the Barton Springs salamander and the Austin blind salamander. Austin American-Statesman (Texas), Aug 14, 2023

000
ABPZ20 KNHC 141737
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 AM PDT Mon Aug 14 2023

For the eastern North Pacific...east of 140 degrees west longitude:

Active Systems:
The National Hurricane Center is issuing advisories on Hurricane
Fernanda, located several hundred miles southwest of the southern
tip of the Baja California peninsula.

Off the Coast of Southern Mexico:
A broad area of low pressure associated with a tropical wave is
producing widespread showers and thunderstorms off the southern
coasts of Mexico, Guatemala, and El Salvador. Environmental
conditions appear conducive for development, and a tropical
depression is expected to form within the next few days, while the
system moves west-northwestward, roughly parallel to the coast of
southern and southwestern Mexico.
* Formation chance through 48 hours...medium...60 percent.
* Formation chance through 7 days...high...90 percent.

South of the Bay of Campeche:
Another area of low pressure could form south of the Gulf of
Tehuantepec over the weekend. Some gradual development of the
system is possible thereafter while it moves generally westward.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...20 percent.

$$
Forecaster D. Zelinsky

Drought has lowered water levels at swimming holes in Central Texas. Jacob’s Well in Hays County has closed due to low flow. Barton Springs Pool in Austin has a 10-day average water flow of 15 cubic feet per second, which is far below the average flow of 68 cfs. The pool remains open, but could close if the water flow slows. Blue Hole in Wimberly has been less affected by the drought as alternate entrances from the aquifer have allowed water to continue to flow, but the swimming hole was only roughly 65% filled. Many wells draw water from area aquifers, leaving less for springs that feed the swimming areas. Austin American-Statesman (Texas), Aug 14, 2023

WW 0643 Status Updates
STATUS FOR WATCH 0643 HAS NOT BEEN ISSUED YET Read more

WW 643 SEVERE TSTM KS 132205Z - 140400Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 643 NWS Storm Prediction Center Norman OK 505 PM CDT Sun Aug 13 2023 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Central into southeast Kansas * Effective this Sunday afternoon and evening from 505 PM until 1100 PM CDT. * Primary threats include... Scattered damaging wind gusts to 70 mph likely Scattered large hail events to 1.5 inches in diameter likely SUMMARY...Scattered supercell development is expected this afternoon and storms will spread east-southeastward through late evening with an attendant threat for large hail up to 1.5 inches in diameter. Some clustering of storms is also expected, which will favor the potential for severe outflow gusts of 60-70 mph. The severe thunderstorm watch area is approximately along and 65 statute miles north and south of a line from 55 miles northwest of Medicine Lodge KS to 20 miles north northeast of Chanute KS. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 640...WW 641...WW 642... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 29025. ...Thompson Read more

MD 1985 CONCERNING SEVERE THUNDERSTORM WATCH 641... FOR PORTIONS OF NORTHERN AND CENTRAL AL...INTO SOUTHERN TN AND NORTHWEST GA
Mesoscale Discussion 1985 NWS Storm Prediction Center Norman OK 0449 PM CDT Sun Aug 13 2023 Areas affected...portions of northern and central AL...into southern TN and northwest GA Concerning...Severe Thunderstorm Watch 641... Valid 132149Z - 132245Z The severe weather threat for Severe Thunderstorm Watch 641 continues. SUMMARY...The risk for damaging gusts should continue across WW641 this afternoon. Storms may continue farther south and east where a new weather watch is possible, but uncertain. DISCUSSION...As of 2135 UTC, regional radar analysis showed a linear cluster of storms ongoing across portions of the TN Valley. Over the last couple of hours, several reports of damaging gusts have been received with gusty outflow winds from these storms. The environment ahead of these storms remains strongly unstable, with 3000+ J/kg of MLCAPE, but only weak vertical shear. So far storms have been semi-organized along a propagating cold pool. Weak shear balance and the favorable buoyancy should allow for strong updrafts and damaging gust potential to continue across north-central AL and portions of southern TN over the next couple of hours. Farther south, uncertainty on the severe risk is higher as additional storms have resulted in some overturning of the air mass west of Atlanta into central AL. Outflow temperatures have dropped into the upper 70s F, which may limit the potential for stronger updrafts as the cluster moves south/southeast later this evening. If storms are able to retain strength as they move into the cooler air, as suggested by several HRRR runs, damaging gusts would be possible into parts of central AL and western GA. Convective trends will be monitored but it is unclear if a new weather watch is needed farther south. ..Lyons/Thompson.. 08/13/2023 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MEG... LAT...LON 35428635 36058538 36028466 35718457 35338456 34988457 34598462 34098474 33598494 33408505 33258532 33198566 33258614 33328649 33458710 33658756 33798782 33958811 34158819 34448816 34708786 34958738 35208676 35428635 Read more

WW 0642 Status Updates
STATUS FOR WATCH 0642 HAS NOT BEEN ISSUED YET Read more

WW 642 SEVERE TSTM OK TX 132145Z - 140400Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 642 NWS Storm Prediction Center Norman OK 445 PM CDT Sun Aug 13 2023 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western and northern Oklahoma and the eastern Oklahoma Panhandle The eastern Texas Panhandle * Effective this Sunday afternoon and evening from 445 PM until 1100 PM CDT. * Primary threats include... Scattered damaging wind gusts to 70 mph likely Scattered large hail events to 1.5 inches in diameter possible SUMMARY...Clusters of storms will continue to form in the Texas Panhandle and spread into western and northern Oklahoma through late evening. The storm environment favors occasional severe outflow winds of 60-70 mph and isolated large hail of 1-1.5 inches in diameter. The severe thunderstorm watch area is approximately along and 85 statute miles east and west of a line from 20 miles northeast of Alva OK to 70 miles west southwest of Clinton OK. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 640...WW 641... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 26025. ...Thompson Read more

WW 0641 Status Updates
STATUS REPORT ON WW 641 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NE UOX TO 25 N HSV TO 25 ESE BWG. ..WEINMAN..08/13/23 ATTN...WFO...HUN...MEG...OHX... STATUS REPORT FOR WS 641 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS ALC033-049-059-071-077-079-083-089-095-103-132240- AL . ALABAMA COUNTIES INCLUDED ARE COLBERT DEKALB FRANKLIN JACKSON LAUDERDALE LAWRENCE LIMESTONE MADISON MARSHALL MORGAN MSC117-141-132240- MS . MISSISSIPPI COUNTIES INCLUDED ARE PRENTISS TISHOMINGO TNC003-015-031-041-051-061-103-111-127-149-159-165-169-177-189- 132240- TN . TENNESSEE COUNTIES INCLUDED ARE Read more

WW 641 SEVERE TSTM AL MS TN 131835Z - 140100Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 641 NWS Storm Prediction Center Norman OK 135 PM CDT Sun Aug 13 2023 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northern Alabama Northeast Mississippi Middle Tennessee * Effective this Sunday afternoon and evening from 135 PM until 800 PM CDT. * Primary threats include... Scattered damaging wind gusts to 60 mph possible SUMMARY...Storms are expected to continue to intensify across the region with a linear cluster evolving, with damaging winds as the primary severe hazard. The severe thunderstorm watch area is approximately along and 80 statute miles north and south of a line from 60 miles northwest of Muscle Shoals AL to 60 miles southeast of Nashville TN. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU1). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 640... AVIATION...A few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 50 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 28025. ...Guyer Read more

WW 0640 Status Updates
STATUS REPORT ON WW 640 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..WEINMAN..08/13/23 ATTN...WFO...GYX...CAR... STATUS REPORT FOR WS 640 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MEC001-003-005-007-009-011-013-015-017-019-021-023-025-027-031- 132240- ME . MAINE COUNTIES INCLUDED ARE ANDROSCOGGIN AROOSTOOK CUMBERLAND FRANKLIN HANCOCK KENNEBEC KNOX LINCOLN OXFORD PENOBSCOT PISCATAQUIS SAGADAHOC SOMERSET WALDO YORK NHC001-003-015-017-132240- NH . NEW HAMPSHIRE COUNTIES INCLUDED ARE BELKNAP CARROLL ROCKINGHAM STRAFFORD THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 640 SEVERE TSTM ME NH 131750Z - 140100Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 640 NWS Storm Prediction Center Norman OK 150 PM EDT Sun Aug 13 2023 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Maine Eastern New Hampshire * Effective this Sunday afternoon and evening from 150 PM until 900 PM EDT. * Primary threats include... Scattered damaging wind gusts to 65 mph possible Scattered large hail events to 1.5 inches in diameter possible SUMMARY...Scattered thunderstorms are forecast to intensify this afternoon with the stronger storms being capable of large hail and damaging gusts. This activity will gradually move from west to east across the watch area through the afternoon into the early evening. The severe thunderstorm watch area is approximately along and 70 statute miles east and west of a line from 30 miles northwest of Caribou ME to 10 miles southeast of Portsmouth NH. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU0). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 55 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 26025. ...Smith Read more

SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0352 PM CDT Sun Aug 13 2023 Valid 151200Z - 211200Z The extended period forecast remains challenging with upper low/Rex block pattern in the eastern Pacific. Model guidance continues to vary with the progression/evolution of this feature in the near term. This variance increases with time. At the surface, a cold front will move through the Southern Plains early in the week. Other cold fronts will make progress into the Plains mid/late week. ...Northwest... Thunderstorm chances will increases into southern Oregon starting on Tuesday. Another push of mid-level moisture will begin on Thursday and renew thunderstorm potential. Activity will move northward each day into the weekend and early next week. There is some uncertainty as to when thunderstorm activity will begin to decrease. The GFS is more bullish on moving a shortwave trough across the Canadian border and pushing moisture out of the region at least temporarily. PWAT values will be a bit on the marginal side for dry thunderstorms in addition to storm motions being relatively slow between the upper low and the stronger mid-level winds to the north. As storms move northward, though, some drier storms would be possible along the leading edge of the moisture. Given all the complicating factors, confidence in placing dry thunderstorm highlights is low. Potential for locally dry and windy conditions is evident within the Cascade gaps/Columbia Gorge as temperatures increase into the Columbia Basin. The signal for more broadly critical fire weather is currently on Thursday when mid-level winds will be stronger and a surface low will deepen to the northeast. This could continue on Friday afternoon as well, but model differences in the upper/low-level patterns decrease confidence. ...Northern California... Thunderstorm activity is possible each afternoon from Tuesday into potentially the weekend. Storm motions will initially be slow and PWAT values will be somewhat high. Lighting outside of storm cores would remain a concern. The upper low is forecast to remain off the central California coast into the weekend and even intensify. As this occurs, drier air may get pulled northward. Thunderstorm potential will gradually decrease south to north with time. A few drier storms may occur later in the week, but with storm potential every afternoon in the same areas, fuels may be affected by that time. ...Montana... With an upper-level trough moving through the northern Plains on Tuesday/Wednesday, some dry and windy conditions are possible for parts of Montana. Some downslope enhancement is possible in the lee of the Rockies on Tuesday. Spatial extent of the fire weather threat appears very limited given the modest surface gradient and upper-level winds. Greater potential for critical fire weather is evident on Thursday as mid-level winds will be somewhat stronger across the terrain and a deeper surface low is expected to the north. Some potential could also exist into Friday, but the evolution of the upper-level/surface pattern is a bit too uncertain for highlights. ...Texas... Cooler, but relatively dry, northerly winds will be present behind the cold front perhaps into Tuesday/Wednesday of next week. There is low-end potential for a pocket of dry and windy conditions to develop in parts of East Texas on the western flank of an upper trough on Tuesday. Heat will return by late week. With a surface trough remaining in the region into the weekend, some concerns for elevated fire weather may develop in portions of western/central Texas. Furthermore, isolated thunderstorms are possible during the afternoons with the intense heat and may pose some concern for lightning ignitions given the dry fuels. ..Wendt.. 08/13/2023 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

5-Day Uncertainty Track last updated Sun, 13 Aug 2023 20:39:07 GMT


Wind Speed Probabilities last updated Sun, 13 Aug 2023 21:22:55 GMT