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SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 AM CDT Thu Sep 26 2024 Valid 261630Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS COASTAL AREAS OF NORTHEAST FLORIDA...GEORGIA...SOUTH CAROLINA...AND FAR SOUTHERN NORTH CAROLINA... ...SUMMARY... Several tornadoes are expected today into tonight across the coastal Southeast in association with Hurricane Helene. The greatest threat is expected across parts of Florida into southeast Georgia, the Midlands and Low Country of South Carolina, and southern North Carolina. ...Florida/Georgia into the Carolinas... Hurricane Helene is currently centered about 200 miles southwest of SRQ. This system is characterized by a very broad/expansive wind field, with the VAD profiles at JAX and CLX showing 50 and 35 kt at 2 km, respectively. Stronger low-level winds are already in place across FL. Rotation has been noted in cells both off the central FL Panhandle south of TLH as well as from coastal GA into the SC Low Country. The general trend of rotation within the deeper, more cellular convection is expected to continue throughout the day into the evening across the entire region, with some chance for an increased frequency of rotating cells given the strengthening wind profiles. Best overlap between modest buoyancy and veering low-level wind profiles is still expected to occur from southeast GA northward into coastal SC and far southern NC (i.e. ILM vicinity). For much of this region, the higher dewpoints currently remain offshore, but additional advection inland is anticipated as the system moves northward. This additional low-level moisture should increase buoyancy slightly, which is expected to result in a relatively higher tornado threat. This relatively higher tornado risk is expected from 04Z to 18Z Friday, which bridges the Day 1 and Day 2 periods. As such, additional information regarding the tornado risk for this area can be found in the Day 2 Convective Outlook. ..Mosier/Lyons.. 09/26/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 AM CDT Thu Sep 26 2024 Valid 261630Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS COASTAL AREAS OF NORTHEAST FLORIDA...GEORGIA...SOUTH CAROLINA...AND FAR SOUTHERN NORTH CAROLINA... ...SUMMARY... Several tornadoes are expected today into tonight across the coastal Southeast in association with Hurricane Helene. The greatest threat is expected across parts of Florida into southeast Georgia, the Midlands and Low Country of South Carolina, and southern North Carolina. ...Florida/Georgia into the Carolinas... Hurricane Helene is currently centered about 200 miles southwest of SRQ. This system is characterized by a very broad/expansive wind field, with the VAD profiles at JAX and CLX showing 50 and 35 kt at 2 km, respectively. Stronger low-level winds are already in place across FL. Rotation has been noted in cells both off the central FL Panhandle south of TLH as well as from coastal GA into the SC Low Country. The general trend of rotation within the deeper, more cellular convection is expected to continue throughout the day into the evening across the entire region, with some chance for an increased frequency of rotating cells given the strengthening wind profiles. Best overlap between modest buoyancy and veering low-level wind profiles is still expected to occur from southeast GA northward into coastal SC and far southern NC (i.e. ILM vicinity). For much of this region, the higher dewpoints currently remain offshore, but additional advection inland is anticipated as the system moves northward. This additional low-level moisture should increase buoyancy slightly, which is expected to result in a relatively higher tornado threat. This relatively higher tornado risk is expected from 04Z to 18Z Friday, which bridges the Day 1 and Day 2 periods. As such, additional information regarding the tornado risk for this area can be found in the Day 2 Convective Outlook. ..Mosier/Lyons.. 09/26/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 AM CDT Thu Sep 26 2024 Valid 261630Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS COASTAL AREAS OF NORTHEAST FLORIDA...GEORGIA...SOUTH CAROLINA...AND FAR SOUTHERN NORTH CAROLINA... ...SUMMARY... Several tornadoes are expected today into tonight across the coastal Southeast in association with Hurricane Helene. The greatest threat is expected across parts of Florida into southeast Georgia, the Midlands and Low Country of South Carolina, and southern North Carolina. ...Florida/Georgia into the Carolinas... Hurricane Helene is currently centered about 200 miles southwest of SRQ. This system is characterized by a very broad/expansive wind field, with the VAD profiles at JAX and CLX showing 50 and 35 kt at 2 km, respectively. Stronger low-level winds are already in place across FL. Rotation has been noted in cells both off the central FL Panhandle south of TLH as well as from coastal GA into the SC Low Country. The general trend of rotation within the deeper, more cellular convection is expected to continue throughout the day into the evening across the entire region, with some chance for an increased frequency of rotating cells given the strengthening wind profiles. Best overlap between modest buoyancy and veering low-level wind profiles is still expected to occur from southeast GA northward into coastal SC and far southern NC (i.e. ILM vicinity). For much of this region, the higher dewpoints currently remain offshore, but additional advection inland is anticipated as the system moves northward. This additional low-level moisture should increase buoyancy slightly, which is expected to result in a relatively higher tornado threat. This relatively higher tornado risk is expected from 04Z to 18Z Friday, which bridges the Day 1 and Day 2 periods. As such, additional information regarding the tornado risk for this area can be found in the Day 2 Convective Outlook. ..Mosier/Lyons.. 09/26/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 AM CDT Thu Sep 26 2024 Valid 261630Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS COASTAL AREAS OF NORTHEAST FLORIDA...GEORGIA...SOUTH CAROLINA...AND FAR SOUTHERN NORTH CAROLINA... ...SUMMARY... Several tornadoes are expected today into tonight across the coastal Southeast in association with Hurricane Helene. The greatest threat is expected across parts of Florida into southeast Georgia, the Midlands and Low Country of South Carolina, and southern North Carolina. ...Florida/Georgia into the Carolinas... Hurricane Helene is currently centered about 200 miles southwest of SRQ. This system is characterized by a very broad/expansive wind field, with the VAD profiles at JAX and CLX showing 50 and 35 kt at 2 km, respectively. Stronger low-level winds are already in place across FL. Rotation has been noted in cells both off the central FL Panhandle south of TLH as well as from coastal GA into the SC Low Country. The general trend of rotation within the deeper, more cellular convection is expected to continue throughout the day into the evening across the entire region, with some chance for an increased frequency of rotating cells given the strengthening wind profiles. Best overlap between modest buoyancy and veering low-level wind profiles is still expected to occur from southeast GA northward into coastal SC and far southern NC (i.e. ILM vicinity). For much of this region, the higher dewpoints currently remain offshore, but additional advection inland is anticipated as the system moves northward. This additional low-level moisture should increase buoyancy slightly, which is expected to result in a relatively higher tornado threat. This relatively higher tornado risk is expected from 04Z to 18Z Friday, which bridges the Day 1 and Day 2 periods. As such, additional information regarding the tornado risk for this area can be found in the Day 2 Convective Outlook. ..Mosier/Lyons.. 09/26/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 AM CDT Thu Sep 26 2024 Valid 261630Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS COASTAL AREAS OF NORTHEAST FLORIDA...GEORGIA...SOUTH CAROLINA...AND FAR SOUTHERN NORTH CAROLINA... ...SUMMARY... Several tornadoes are expected today into tonight across the coastal Southeast in association with Hurricane Helene. The greatest threat is expected across parts of Florida into southeast Georgia, the Midlands and Low Country of South Carolina, and southern North Carolina. ...Florida/Georgia into the Carolinas... Hurricane Helene is currently centered about 200 miles southwest of SRQ. This system is characterized by a very broad/expansive wind field, with the VAD profiles at JAX and CLX showing 50 and 35 kt at 2 km, respectively. Stronger low-level winds are already in place across FL. Rotation has been noted in cells both off the central FL Panhandle south of TLH as well as from coastal GA into the SC Low Country. The general trend of rotation within the deeper, more cellular convection is expected to continue throughout the day into the evening across the entire region, with some chance for an increased frequency of rotating cells given the strengthening wind profiles. Best overlap between modest buoyancy and veering low-level wind profiles is still expected to occur from southeast GA northward into coastal SC and far southern NC (i.e. ILM vicinity). For much of this region, the higher dewpoints currently remain offshore, but additional advection inland is anticipated as the system moves northward. This additional low-level moisture should increase buoyancy slightly, which is expected to result in a relatively higher tornado threat. This relatively higher tornado risk is expected from 04Z to 18Z Friday, which bridges the Day 1 and Day 2 periods. As such, additional information regarding the tornado risk for this area can be found in the Day 2 Convective Outlook. ..Mosier/Lyons.. 09/26/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 AM CDT Thu Sep 26 2024 Valid 261630Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS COASTAL AREAS OF NORTHEAST FLORIDA...GEORGIA...SOUTH CAROLINA...AND FAR SOUTHERN NORTH CAROLINA... ...SUMMARY... Several tornadoes are expected today into tonight across the coastal Southeast in association with Hurricane Helene. The greatest threat is expected across parts of Florida into southeast Georgia, the Midlands and Low Country of South Carolina, and southern North Carolina. ...Florida/Georgia into the Carolinas... Hurricane Helene is currently centered about 200 miles southwest of SRQ. This system is characterized by a very broad/expansive wind field, with the VAD profiles at JAX and CLX showing 50 and 35 kt at 2 km, respectively. Stronger low-level winds are already in place across FL. Rotation has been noted in cells both off the central FL Panhandle south of TLH as well as from coastal GA into the SC Low Country. The general trend of rotation within the deeper, more cellular convection is expected to continue throughout the day into the evening across the entire region, with some chance for an increased frequency of rotating cells given the strengthening wind profiles. Best overlap between modest buoyancy and veering low-level wind profiles is still expected to occur from southeast GA northward into coastal SC and far southern NC (i.e. ILM vicinity). For much of this region, the higher dewpoints currently remain offshore, but additional advection inland is anticipated as the system moves northward. This additional low-level moisture should increase buoyancy slightly, which is expected to result in a relatively higher tornado threat. This relatively higher tornado risk is expected from 04Z to 18Z Friday, which bridges the Day 1 and Day 2 periods. As such, additional information regarding the tornado risk for this area can be found in the Day 2 Convective Outlook. ..Mosier/Lyons.. 09/26/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 AM CDT Thu Sep 26 2024 Valid 261630Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS COASTAL AREAS OF NORTHEAST FLORIDA...GEORGIA...SOUTH CAROLINA...AND FAR SOUTHERN NORTH CAROLINA... ...SUMMARY... Several tornadoes are expected today into tonight across the coastal Southeast in association with Hurricane Helene. The greatest threat is expected across parts of Florida into southeast Georgia, the Midlands and Low Country of South Carolina, and southern North Carolina. ...Florida/Georgia into the Carolinas... Hurricane Helene is currently centered about 200 miles southwest of SRQ. This system is characterized by a very broad/expansive wind field, with the VAD profiles at JAX and CLX showing 50 and 35 kt at 2 km, respectively. Stronger low-level winds are already in place across FL. Rotation has been noted in cells both off the central FL Panhandle south of TLH as well as from coastal GA into the SC Low Country. The general trend of rotation within the deeper, more cellular convection is expected to continue throughout the day into the evening across the entire region, with some chance for an increased frequency of rotating cells given the strengthening wind profiles. Best overlap between modest buoyancy and veering low-level wind profiles is still expected to occur from southeast GA northward into coastal SC and far southern NC (i.e. ILM vicinity). For much of this region, the higher dewpoints currently remain offshore, but additional advection inland is anticipated as the system moves northward. This additional low-level moisture should increase buoyancy slightly, which is expected to result in a relatively higher tornado threat. This relatively higher tornado risk is expected from 04Z to 18Z Friday, which bridges the Day 1 and Day 2 periods. As such, additional information regarding the tornado risk for this area can be found in the Day 2 Convective Outlook. ..Mosier/Lyons.. 09/26/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 AM CDT Thu Sep 26 2024 Valid 261630Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS COASTAL AREAS OF NORTHEAST FLORIDA...GEORGIA...SOUTH CAROLINA...AND FAR SOUTHERN NORTH CAROLINA... ...SUMMARY... Several tornadoes are expected today into tonight across the coastal Southeast in association with Hurricane Helene. The greatest threat is expected across parts of Florida into southeast Georgia, the Midlands and Low Country of South Carolina, and southern North Carolina. ...Florida/Georgia into the Carolinas... Hurricane Helene is currently centered about 200 miles southwest of SRQ. This system is characterized by a very broad/expansive wind field, with the VAD profiles at JAX and CLX showing 50 and 35 kt at 2 km, respectively. Stronger low-level winds are already in place across FL. Rotation has been noted in cells both off the central FL Panhandle south of TLH as well as from coastal GA into the SC Low Country. The general trend of rotation within the deeper, more cellular convection is expected to continue throughout the day into the evening across the entire region, with some chance for an increased frequency of rotating cells given the strengthening wind profiles. Best overlap between modest buoyancy and veering low-level wind profiles is still expected to occur from southeast GA northward into coastal SC and far southern NC (i.e. ILM vicinity). For much of this region, the higher dewpoints currently remain offshore, but additional advection inland is anticipated as the system moves northward. This additional low-level moisture should increase buoyancy slightly, which is expected to result in a relatively higher tornado threat. This relatively higher tornado risk is expected from 04Z to 18Z Friday, which bridges the Day 1 and Day 2 periods. As such, additional information regarding the tornado risk for this area can be found in the Day 2 Convective Outlook. ..Mosier/Lyons.. 09/26/2024 Read more

MD 2112 CONCERNING SEVERE POTENTIAL...TORNADO WATCH LIKELY FOR SOUTHERN GEORGIA...NORTHERN FLORIDA AND PORTIONS OF THE FLORIDA PANHANDLE
Mesoscale Discussion 2112 NWS Storm Prediction Center Norman OK 0912 AM CDT Thu Sep 26 2024 Areas affected...southern Georgia...northern Florida and portions of the Florida Panhandle Concerning...Severe potential...Tornado Watch likely Valid 261412Z - 261515Z Probability of Watch Issuance...95 percent SUMMARY...Tornado threat will continue to gradually increase in advance of Hurricane Helene, across southern Georgia/northern Florida and adjacent areas. Tornado Watch issuance will likely be needed in the next hour. DISCUSSION...Latest radar loop shows widespread rain, and embedded/small convective cores moving north-northwestward across the northeastern Gulf and adjacent portions of the Florida Panhandle. Small/offshore cells are exhibiting low-level rotation, moving northwestward toward Gulf and Franklin Counties, southwest of Tallahassee. With occasional rotation expected with convective elements within the broader convective bands north and northeast of Helene given increasingly favorable low-level shear, and thus a long-duration tornado risk, a Tornado Watch will likely be needed shortly. ..Goss/Mosier.. 09/26/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CHS...MLB...TBW...JAX...TAE...MOB... LAT...LON 30378651 31518524 31578030 29318011 29368384 29338581 30378651 Read more

MD 2111 CONCERNING TORNADO WATCH 683... FOR SOUTHERN AND CENTRAL FLORIDA PENINSULA
Mesoscale Discussion 2111 NWS Storm Prediction Center Norman OK 0807 AM CDT Thu Sep 26 2024 Areas affected...Southern and Central Florida Peninsula Concerning...Tornado Watch 683... Valid 261307Z - 261500Z The severe weather threat for Tornado Watch 683 continues. SUMMARY...A tornado threat will continue across the Florida Peninsula this morning, persisting into the early afternoon. DISCUSSION...Hurricane Helene is currently located in the eastern Gulf of Mexico. Several rainbands, with embedded thunderstorms, are located across the eastern Gulf of Mexico extending across the Florida Peninsula. The latest RAP has a pocket of moderate instability across the southern and central Florida Peninsula, with MLCAPE estimated in the 1000 to 2000 J/kg range. This is consistent with the Miami, Florida 12Z sounding, which also has 0-6 km shear in the 30 to 35 knot range, and 0-3 km storm-relative helicity around 300 m2/s2. This environment will continue to be favorable for tornadoes with semi-discrete supercells embedded in the outer rainbands of Hurricane Helene. The tornado threat should continue this morning and into the early afternoon as Hurricane Helene moves northward across the eastern Gulf of Mexico. ..Broyles.. 09/26/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...MFL...MLB...KEY...TBW... LAT...LON 27828021 28368038 28628057 28808105 28838160 28648211 28138236 27308239 26288209 25578157 25188105 25128074 25248039 25598009 26467994 27828021 Read more

WW 0685 Status Updates
STATUS FOR WATCH 0685 HAS NOT BEEN ISSUED YET Read more

WW 0685 Status Updates
STATUS FOR WATCH 0685 HAS NOT BEEN ISSUED YET Read more

WW 0685 Status Updates
STATUS FOR WATCH 0685 HAS NOT BEEN ISSUED YET Read more

WW 0685 Status Updates
STATUS FOR WATCH 0685 HAS NOT BEEN ISSUED YET Read more

5-Day Uncertainty Track last updated Thu, 26 Sep 2024 14:40:36 GMT


Wind Speed Probabilities last updated Thu, 26 Sep 2024 15:36:10 GMT

Issued at 900 AM CST Thu Sep 26 2024 000 WTPZ45 KNHC 261439 TCDEP5 Hurricane John Discussion Number 15 NWS National Hurricane Center Miami FL EP102024 900 AM CST Thu Sep 26 2024 John continues to depict a small inner core, with earlier microwave images depicting a small eye feature. Since that microwave pass, the eye feature has become more prevalent on infrared imagery. The UW-CIMSS objective intensity guidance ranges from 65 to 75 kt. The subjective satellite estimates from TAFB and SAB are both 65 kt, respectively. Using a blend of the intensity estimates and the continued improved satellite depiction, the intensity is set at 65 kt for this advisory. The hurricane is estimated to be moving northwestward at 310/5 kt. The official forecast is shifted slightly to the right in the near term, which follows recent satellite trends and lies near the latest HCCA consensus aid. On the forecast track, the center of John is forecast to approach and move along the coast of southwestern Mexico or just inland later today. However, some of the global model fields do linger the system offshore near the coast a little longer, particularly the ECMWF global model. In the long term, a turn back to the west-northwest is anticipated as the system weakens and is steered by the ridge over northern Mexico. The overall environment remains favorable for John to continue to strengthen until landfall with very warm sea surface temperatures, low wind shear, abundant moisture throughout all levels of the atmosphere. The latest NHC intensity forecast continues to call for strengthening up until landfall and shows a peak intensity of 75 kt, which is slightly lower than previous intensity peak due to the latest forecast showing the system moving inland a little faster than the previous forecast. John has very large rain shield and flooding impacts will extend well outside where the system makes landfall. It cannot be emphasized enough that catastrophic life-threatening flash flooding and mudslides are expected to continue through the end of the week for portions of the Mexican States of Guerrero, Oaxaca and Michoacan. KEY MESSAGES: 1. Hurricane John will bring additional very heavy rainfall to coastal portions of southwest Mexico through Friday. The additional rainfall totals will be falling across areas that have received very heavy rainfall amounts over the past few days. This heavy rainfall will likely cause significant and catastrophic life-threatening flash flooding and mudslides to the Mexican States of Guerrero and Michoacán. 2. John is forecast to continue strengthening up until landfall, and a Hurricane Warning is in effect along the coastline of southwestern Mexico, where tropical storm conditions are imminent. Tropical Storm Warnings are also in effect for portions of the area and tropical storm are ongoing. FORECAST POSITIONS AND MAX WINDS INIT 26/1500Z 17.5N 102.7W 65 KT 75 MPH 12H 27/0000Z 18.0N 102.9W 75 KT 85 MPH...NEAR COAST 24H 27/1200Z 18.6N 103.4W 45 KT 50 MPH...INLAND 36H 28/0000Z 19.2N 104.2W 30 KT 35 MPH...INLAND 48H 28/1200Z 19.8N 105.4W 30 KT 35 MPH...POST-TROP/REMNT LOW 60H 29/0000Z 20.5N 107.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 29/1200Z...DISSIPATED $$ Forecaster Kelly

Issued at 1500 UTC THU SEP 26 2024 000 FOPZ15 KNHC 261439 PWSEP5 HURRICANE JOHN WIND SPEED PROBABILITIES NUMBER 15 NWS NATIONAL HURRICANE CENTER MIAMI FL EP102024 1500 UTC THU SEP 26 2024 AT 1500Z THE CENTER OF HURRICANE JOHN WAS LOCATED NEAR LATITUDE 17.5 NORTH...LONGITUDE 102.7 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 65 KTS...75 MPH...120 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 12Z THU 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 THU 00Z FRI 12Z FRI 00Z SAT 12Z SAT 12Z SUN 12Z MON PERIODS TO TO TO TO TO TO TO 00Z FRI 12Z FRI 00Z SAT 12Z SAT 12Z SUN 12Z MON 12Z TUE FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT ISLAS MARIAS 34 X 1( 1) X( 1) 1( 2) 1( 3) X( 3) X( 3) SAN BLAS 34 X 1( 1) 1( 2) X( 2) 1( 3) X( 3) X( 3) BARRA NAVIDAD 34 X 2( 2) 4( 6) 1( 7) X( 7) X( 7) X( 7) MANZANILLO 34 3 19(22) 7(29) 1(30) X(30) X(30) X(30) MANZANILLO 50 X 1( 1) 3( 4) X( 4) X( 4) X( 4) X( 4) L CARDENAS 34 96 1(97) X(97) X(97) X(97) X(97) X(97) L CARDENAS 50 8 1( 9) X( 9) X( 9) X( 9) X( 9) X( 9) L CARDENAS 64 2 X( 2) X( 2) X( 2) X( 2) X( 2) X( 2) ZIHUATANEJO 34 59 1(60) 1(61) X(61) X(61) X(61) X(61) $$ FORECASTER KELLY

Issued at 900 AM CST Thu Sep 26 2024 000 WTPZ35 KNHC 261439 TCPEP5 BULLETIN Hurricane John Advisory Number 15 NWS National Hurricane Center Miami FL EP102024 900 AM CST Thu Sep 26 2024 ...HURRICANE JOHN IS PRODUCING CATASTROPHIC LIFE-THREATENING FLASH FLOODING AND MUDSLIDES OVER PORTIONS OF SOUTHERN MEXICO... SUMMARY OF 900 AM CST...1500 UTC...INFORMATION ---------------------------------------------- LOCATION...17.5N 102.7W ABOUT 50 MI...75 KM SW OF LAZARO CARDENAS MEXICO ABOUT 75 MI...120 KM W OF ZIHUATANEJO MEXICO MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H PRESENT MOVEMENT...NW OR 325 DEGREES AT 5 MPH...7 KM/H MINIMUM CENTRAL PRESSURE...979 MB...28.91 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Mexico has issued a Hurricane Watch from west of Punta San Telmo to Manzanillo. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Tecpan de Galeana to Punta San Telmo A Hurricane Watch is in effect for... * West of Punta San Telmo to Manzanillo A Tropical Storm Warning is in effect for... * Punta Maldonado to east of Tecpan de Galeana * West of Punta San Telmo to Manzanillo A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area, in this case within 12 to 18 hours. Preparations to protect life and property should be rushed to completion. A Hurricane Watch means that hurricane conditions are possible within the watch area, in this case within 24 hours. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within 12 hours. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 900 AM CST (1500 UTC), the center of Hurricane John was located near latitude 17.5 North, longitude 102.7 West. John is moving toward the northwest near 5 mph (7 km/h), and this motion should continue through the remainder of today. On the forecast track, the center of John is forecast to approach and move along the coast of southwestern Mexico or just inland on later today. Maximum sustained winds are near 75 mph (120 km/h) with higher gusts. Additional strengthening is expected until the center moves along the coast or inland later today, which should cause John to quickly weaken to a depression Friday Hurricane-force winds extend outward up to 10 miles (20 km) from the center and tropical-storm-force winds extend outward up to 140 miles (220 km). The estimated minimum central pressure is 979 mb (28.91 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Through Friday, Hurricane John is expected to produce additional rainfall amounts of 10 to 20 inches across portions of the Mexican States of Guerrero and Michoacán. Additional rainfall o 2 to 4 inches with locally up to 6 inches expected across the Mexican States of Colima and western Oaxaca. For a complete depiction of forecast rainfall associated with John, please see the National Weather Service Storm Total Rainfall Graphic, available at hurricanes.gov/graphics_ep5.shtml?rainqpf STORM SURGE: A dangerous storm surge is expected to produce coastal flooding near and to the east of where the center makes landfall. Near the coast, the surge will be accompanied by large and destructive waves. WIND: Hurricane conditions are expected along the coast within the hurricane warning area by tonight or early Friday. Winds are expected to first reach tropical storm strength later within a few hours. Wind speeds atop and on the windward sides of hills and mountains are often up to 30 percent stronger than the near-surface winds indicated in this advisory, and in some elevated locations could be even greater. Tropical storm conditions are currently occurring over portions of the coast within the tropical storm warning area, and should continue through today. SURF: Swells associated with John are forecast to continue to affect the coast of southern and southwestern Mexico through the week, with the potential for dangerous surf and rip currents. Please see local statements for more information. NEXT ADVISORY ------------- Next intermediate advisory at 1200 PM CST. Next complete advisory at 300 PM CST. $$ Forecaster Kelly

...HURRICANE JOHN IS PRODUCING CATASTROPHIC LIFE-THREATENING FLASH FLOODING AND MUDSLIDES OVER PORTIONS OF SOUTHERN MEXICO... As of 9:00 AM CST Thu Sep 26 the center of John was located near 17.5, -102.7 with movement NW at 5 mph. The minimum central pressure was 979 mb with maximum sustained winds of about 75 mph.

Issued at 1500 UTC THU SEP 26 2024 000 WTPZ25 KNHC 261438 TCMEP5 HURRICANE JOHN FORECAST/ADVISORY NUMBER 15 NWS NATIONAL HURRICANE CENTER MIAMI FL EP102024 1500 UTC THU SEP 26 2024 HURRICANE CENTER LOCATED NEAR 17.5N 102.7W AT 26/1500Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 325 DEGREES AT 4 KT ESTIMATED MINIMUM CENTRAL PRESSURE 979 MB MAX SUSTAINED WINDS 65 KT WITH GUSTS TO 80 KT. 64 KT....... 10NE 10SE 0SW 0NW. 50 KT....... 15NE 15SE 15SW 15NW. 34 KT....... 40NE 120SE 60SW 50NW. 12 FT SEAS.. 30NE 360SE 300SW 90NW. 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 17.5N 102.7W AT 26/1500Z AT 26/1200Z CENTER WAS LOCATED NEAR 17.4N 102.6W FORECAST VALID 27/0000Z 18.0N 102.9W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 10NE 0SE 0SW 0NW. 50 KT... 20NE 15SE 15SW 10NW. 34 KT... 40NE 120SE 60SW 50NW. FORECAST VALID 27/1200Z 18.6N 103.4W...INLAND MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 10NE 80SE 40SW 20NW. FORECAST VALID 28/0000Z 19.2N 104.2W...INLAND MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 28/1200Z 19.8N 105.4W...POST-TROP/REMNT LOW MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 29/0000Z 20.5N 107.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 29/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 17.5N 102.7W INTERMEDIATE PUBLIC ADVISORY...WTNT35 KNHC/MIATCPEP5...AT 26/1800Z NEXT ADVISORY AT 26/2100Z $$ FORECASTER KELLY