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| #1192554 (Received by flhurricane at: 1:39 AM 07.Aug.2024) TCPAT4 BULLETIN Tropical Storm Debby Intermediate Advisory Number 19A NWS National Hurricane Center Miami FL AL042024 200 AM EDT Wed Aug 07 2024 ...DEBBY A LITTLE STRONGER... ...MAJOR FLOOD THREAT CONTINUES FOR PORTIONS OF THE CAROLINAS... SUMMARY OF 200 AM EDT...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...31.8N 79.8W ABOUT 70 MI...110 KM S OF CHARLESTON SOUTH CAROLINA ABOUT 75 MI...120 KM ESE OF SAVANNAH GEORGIA MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H PRESENT MOVEMENT...ESE OR 105 DEGREES AT 5 MPH...7 KM/H MINIMUM CENTRAL PRESSURE...996 MB...29.42 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Watch is in effect for... * North of South Santee River, South Carolina to Cape Fear, North Carolina A Tropical Storm Warning is in effect for... * North of the Savannah River to Surf City, North Carolina A Tropical Storm Watch is in effect for... * North of Surf City, North Carolina to Beaufort Inlet, North Carolina 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 Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. Interests elsewhere along the southeastern coast of the United States should monitor the progress of this system. Additional watches or warnings may be required on Wednesday. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 200 AM EDT (0600 UTC), the center of Tropical Storm Debby was located near latitude 31.8 North, longitude 79.8 West. Debby is moving toward the east-southeast near 5 mph (7 km/h). A slow motion toward the east and then north is expected today through Thursday night. On the forecast track, the center of Debby is expected to slowly move away from the coast of Georgia and South Carolina tonight, continue to drift offshore through early Thursday, and then move inland over South Carolina on Thursday. Satellite-derived wind data indicate that maximum sustained winds have increased to near 45 mph (75 km/h) with higher gusts. Some additional strengthening is forecast while the center of Debby remains offshore. Weakening is expected Thursday night and Friday after landfall. Tropical-storm-force winds extend outward up to 175 miles (280 km) mainly to the southeast and south of the center. The estimated minimum central pressure is 996 mb (29.42 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Debby can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC. WIND: Tropical storm conditions are expected to continue along the coast of South Carolina within the tropical storm warning area through Thursday night. Tropical storm conditions are expected within the tropical storm warning area and possible within the tropical storm watch area in North Carolina beginning today and continuing through Thursday night. STORM SURGE: The combination of storm surge and 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... South Santee River, SC to Cape Fear, NC...2-4 ft 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. RAINFALL: Debby is expected to produce potentially historic storm total rainfall of 10 to 20 inches, with maximum amounts of 25 inches, bringing areas of catastrophic flooding across portions of eastern South Carolina and southeast North Carolina through Friday. From central South Carolina to the Upstate of South Carolina, northward into Southwest Virginia, portions of the Mid-Atlantic States, western and northern New York State into Northern New England, 3 to 6 inches with local amounts to 8 inches, are expected through Saturday. This rainfall will likely result in areas of considerable flash and urban flooding, with river flooding possible. An additional scattered 1 to 3 inches of rainfall is possible across southeast Georgia through this morning, which may aggravate any ongoing flooding conditions across that vicinity. For a complete depiction of forecast rainfall and flash flooding associated with Debby, 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: A few tornadoes are possible over portions of coastal South Carolina and North Carolina through this morning. SURF: Large swells will continue to affect the Southeast U.S. coast through the end of the week. These conditions 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 500 AM EDT. $$ Forecaster Berg |
