Issued at 500 AM EDT Fri Sep 27 2024
467 WTNT34 KNHC 270853 TCPAT4 BULLETIN Tropical Storm Helene Advisory Number 16 NWS National Hurricane Center Miami FL AL092024 500 AM EDT Fri Sep 27 2024 ...HELENE WEAKENS TO A TROPICAL STORM AS IT MOVES FARTHER INLAND OVER GEORGIA... ...LIFE-THREATENING STORM SURGE, WINDS, AND HEAVY RAINS CONTINUE... SUMMARY OF 500 AM EDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...32.8N 83.0W ABOUT 40 MI...65 KM E OF MACON GEORGIA ABOUT 100 MI...165 KM SE OF ATLANTA GEORGIA MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...N OR 360 DEGREES AT 30 MPH...48 KM/H MINIMUM CENTRAL PRESSURE...968 MB...28.59 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: All Hurricane and Tropical Storm warnings have been discontinued along the Florida east coast south of the Flagler/Volusia county line, and along the Florida west coast south of the mouth of the Suwannee River. The Hurricane Warning for the Florida coast from the mouth of the Suwannee Rover to Mexico Beach has been changed to a Tropical Storm Warning. The Tropical Storm Warning has been discontinued for the Florida Gulf coast west of Indian Pass. The Storm Surge Warning for the Florida coast has been discontinued west of Indian Pass and south of Bonita Beach. The Hurricane Watch for the Florida West coast has been discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Indian Pass to Bonita Beach * Tampa Bay A Tropical Storm Warning is in effect for... * The mouth of the Suwannee River to Indian Pass * The Flagler/Volusia county line 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. 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. 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 500 AM EDT (0900 UTC), the center of Tropical Storm Helene was located near latitude 32.8 North, longitude 83.0 West. Helene is moving toward the north near 30 mph (48 km/h). A turn toward the north is expected this morning, taking the center over central and northeastern Georgia. After that, Helene is expected to turn northwestward and slow down over the Tennessee Valley later today and Saturday. Maximum sustained winds have decreased to near 70 mph (110 km/h) with higher gusts. Continued weakening is expected, and Helene is expected to become a post-tropical low this afternoon or tonight. However, the fast forward speed will allow strong, damaging winds, especially in gusts, to penetrate well 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. The Marine Corp Air Station at Beaufort, South Carolina, recently reported a wind gust of 75 mph (120 km/h). The minimum central pressure based on surface observations is 968 mb (28.59 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 Chassahowitzka, FL to Anclote River, FL...4-7 ft Indian Pass, FL to Aucilla River, FL...3-6 ft Anclote River, FL to Englewood, FL...3-5 ft Tampa Bay...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 from northern Florida through eastern Georgia into southern South Carolina, and these conditions will continue spreading northward across the tropical storm warning areas in the Southeastern U.S. through today. Strong, damaging winds, especially in gusts, will likely penetrate 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 much of Florida and the coasts of Georgia and the Carolinas during the next couple of days. 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 800 AM EDT. Next complete advisory at 1100 AM EDT. $$ Forecaster Beven
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