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Tropical Storm Helene Public Advisory Number 16A
2024-09-27 13:52:55| National Hurricane Center (Atlantic)
Issued at 800 AM EDT Fri Sep 27 2024 000 WTNT34 KNHC 271152 TCPAT4 BULLETIN Tropical Storm Helene Intermediate Advisory Number 16A NWS National Hurricane Center Miami FL AL092024 800 AM EDT Fri Sep 27 2024 ...HELENE PRODUCING DAMAGING GUSTY WINDS AND LIFE-THREATENING FLOODING OVER PORTIONS OF THE SOUTHEAST AND SOUTHERN APPALACHIANS... ...FLASH FLOOD EMERGENCY IN EFFECT FOR METROPOLITAN ATLANTA... SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...34.2N 83.0W ABOUT 35 MI...60 KM SSW OF CLEMSON SOUTH CAROLINA ABOUT 80 MI...130 KM ENE OF ATLANTA GEORGIA MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...N OR 360 DEGREES AT 30 MPH...48 KM/H MINIMUM CENTRAL PRESSURE...972 MB...28.70 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Tropical Storm Warning along the Florida Gulf Coast from the mouth of the Suwannee River to Indian Pass has been discontinued. The Tropical Storm Warning along the east coast of Florida and extreme southeastern Georgia from the Flagler/Volusia County Line to Altamaha Sound has been discontinued. The Storm Surge Warning for the Florida coast has been discontinued south of the Middle of Longboat Key. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Indian Pass to Middle of Longboat Key, Florida * Tampa Bay A Tropical Storm Warning is in effect for... * Altamaha Sound northward to Little River Inlet A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline. 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. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area. 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. DISCUSSION AND OUTLOOK ---------------------- At 800 AM EDT (1200 UTC), the center of Tropical Storm Helene was located near latitude 34.2 North, longitude 83.0 West. Helene is moving toward the north near 30 mph (48 km/h). Helene is expected to turn northwestward and slow down over the Tennessee Valley later today and Saturday. Maximum sustained winds have decreased to near 60 mph (95 km/h) with higher gusts. Continued weakening is expected, and Helene is expected to become a post-tropical low this afternoon or tonight. However, damaging wind gusts will penetrate far inland across the southeastern United States, including over the higher terrain of the southern Appalachians. Tropical-storm-force winds extend outward up to 275 miles (445 km) mainly to the east of the center. An observation in Brasstown Bald, Georgia recently reported a wind gust of 72 mph (116 km/h). An observation in Dewees Island, South Carolina, recently reported a sustained wind of 46 mph (74 km/h) and a gust of 62 mph (100 km/h). The minimum central pressure based on surface observations is 972 mb (28.70 inches). HAZARDS AFFECTING LAND ---------------------- Key Messages for Helene can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC and on the web at hurricanes.gov/text/MIATCDAT4.shtml STORM SURGE: The combination of a life-threatening 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... Aucilla River, FL to Chassahowitzka, FL...5-10 ft Indian Pass, FL to Aucilla River, FL...3-6 ft Chassahowitzka, FL to Anclote River, FL...3-5 ft The deepest water will occur along the immediate coast near and to the east of the landfall location, 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. For a complete depiction of areas at risk of storm surge inundation, please see the National Weather Service Peak Storm Surge Graphic, available at hurricanes.gov/graphics_at4.shtml?peakSurge. WIND: Tropical storm conditions are occurring along much of the Georgia and South Carolina coasts, and these conditions will continue for the next several hours. Strong, damaging winds, especially in gusts, will also continue as far inland as the higher terrain of the southern Appalachians. RAINFALL: Over portions of the Southeastern U.S. into the Southern Appalachians, Helene is expected to produce total rain accumulations of 6 to 12 inches, with isolated totals around 20 inches. This rainfall will likely result in catastrophic and potentially life-threatening flash and urban flooding, along with significant and record river flooding. Numerous significant landslides are expected in steep terrain across the southern Appalachians. For a complete depiction of forecast rainfall associated with Hurricane Helene, please see the National Weather Service Storm Total Rainfall Graphic, available at hurricanes.gov/graphics_at4.shtml?rainqpf and the Flash Flood Risk graphic at hurricanes.gov/graphics_at4.shtml?ero. For a list of rainfall observations (and wind reports) associated this storm, see the companion storm summary at WBCSCCNS4 with the WMO header ACUS44 KWBC or at the following link: www.wpc.ncep.noaa.gov/discussions/nfdscc4.html. TORNADOES: Tornadoes are possible this morning over parts of eastern Georgia, and through this afternoon over the Carolinas and southern Virginia. SURF: Swells generated by Helene will affect the coasts of Georgia and the Carolinas during the next day or so. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1100 AM EDT. $$ Forecaster Cangialosi/Harrigan
Category:Transportation and Logistics
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Atlantic Tropical Weather Outlook
2024-09-27 13:46:24| National Hurricane Center (Atlantic)
000 ABNT20 KNHC 271146 TWOAT Tropical Weather Outlook NWS National Hurricane Center Miami FL 800 AM EDT Fri Sep 27 2024 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: Active Systems: The National Hurricane Center is issuing advisories on Tropical Storm Helene, located inland over northeast Georgia and on recently upgraded Hurricane Isaac, located over the central Subtropical Atlantic Ocean. Central Tropical Atlantic (AL98): Showers and thunderstorms associated with an area of low pressure located midway in between the Cabo Verde Islands and the Lesser Antilles continues to become better organized. This disturbance is already producing gale-force winds. Environmental conditions are conducive for further development and a tropical depression or storm could form today while the system moves generally westward to west-northwestward at 10 to 15 mph. The system is then forecast to slow down and turn north-northwestward by this weekend. Additional information on this system, including gale warnings, can be found in High Seas Forecasts issued by the National Weather Service. * Formation chance through 48 hours...high...90 percent. * Formation chance through 7 days...high...90 percent. Western Caribbean: An area of low pressure could form over the western Caribbean Sea by the middle of next week. Environmental conditions are expected to be conducive for slow development thereafter while the system moves generally northwestward, potentially entering the Gulf of Mexico by the end of next week. * Formation chance through 48 hours...low...near 0 percent. * Formation chance through 7 days...low...30 percent. Eastern Tropical Atlantic: An area of low pressure could form over the eastern tropical Atlantic by the early to middle part of next week. Environmental conditions are expected to be conducive for slow development thereafter while the system moves generally northwestward at 10 to 15 mph. * Formation chance through 48 hours...low...near 0 percent. * Formation chance through 7 days...low...20 percent. && High Seas Forecasts issued by the National Weather Service can be found under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and online at ocean.weather.gov/shtml/NFDHSFAT1.php $$ Forecaster Kelly/Rosado
Category: Transportation and Logistics
Eastern North Pacific Tropical Weather Outlook
2024-09-27 13:44:54| National Hurricane Center (East Pacific)
000 ABPZ20 KNHC 271144 TWOEP Tropical Weather Outlook NWS National Hurricane Center Miami FL 500 AM PDT Fri Sep 27 2024 For the eastern North Pacific...east of 140 degrees west longitude: Active Systems: The National Hurricane Center is issuing advisories on Tropical Storm John, located very near the coast of southwestern Mexico. Tropical cyclone formation is not expected during the next 7 days. $$ Forecaster Cangialosi
Category: Transportation and Logistics