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| #1192090 (Received by flhurricane at: 10:57 PM 04.Aug.2024) TCPAT4 BULLETIN Hurricane Debby Advisory Number 11 NWS National Hurricane Center Miami FL AL042024 1100 PM EDT Sun Aug 04 2024 ...DEBBY BECOMES A HURRICANE AS IT APPROACHES THE NORTHEASTERN GULF COAST... ...WILL BRING A MAJOR FLOOD THREAT TO THE SOUTHEASTERN UNITED STATES THIS WEEK... SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...28.6N 84.0W ABOUT 65 MI...105 KM WSW OF CEDAR KEY FLORIDA ABOUT 100 MI...160 KM WNW OF TAMPA FLORIDA MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H PRESENT MOVEMENT...N OR 360 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...985 MB...29.09 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: A Hurricane Warning has been issued for the Florida Gulf coast from Suwannee River to Yankeetown. The Tropical Storm Watch along the coast of South Carolina from the Savannah River to South Santee River has been changed to a Tropical Storm Warning. The Tropical Storm Warning south of Boca Grande has been discontinued. The Storm Surge Watch south of Englewood has been discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Florida coast from the middle of Longboat Key northward to Indian Pass including Tampa Bay * Georgia and South Carolina coast from the Mouth of the St. Mary's River to South Santee River South Carolina A Storm Surge Watch is in effect for... * Florida coast from Englewood northward to the middle of Longboat Key, including Charlotte Harbor A Hurricane Warning is in effect for... * Florida coast from the Yankeetown to Indian Pass A Tropical Storm Warning is in effect for... * Florida coast south of Yankeetown to Boca Grande * Florida coast from west of Indian Pass to Mexico Beach * Ponte Vedre Beach to South Santee River South Carolina A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. Preparations to protect life and property should be rushed to completion. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Hurricane Watch means that hurricane conditions are possible within the watch area. 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 Storm Surge Watch means there is a possibility 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. Interests elsewhere along the southeastern coast of the United States should monitor the progress of this system. Additional watches and warnings will likely be required tonight or Monday. 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 1100 PM EDT (0300 UTC), the center of Hurricane Debby was located near latitude 28.6 North, longitude 84.0 West. Debby is moving toward the north near 12 mph (19 km/h). A gradual decrease in forward speed with a turn toward the northeast and east is expected on Monday and Tuesday. On the forecast track, the center will move across the northeastern Gulf of Mexico tonight and reach the Florida Big Bend coast Monday morning. Debby is then expected to move slowly across northern Florida and southern Georgia Monday and Tuesday, and be near the Georgia coast by Tuesday night. Data from Air Force and NOAA reconnaissance aircraft indicate that maximum sustained winds have increased to near 75 mph (120 km/h) with higher gusts. Additional strengthening is likely before Debby reaches the Florida Big Bend coast on Monday. Weakening is expected on Monday and Tuesday after Debby moves inland. Hurricane-force winds extend outward up to 45 miles (75 km) from the center and tropical-storm-force winds extend outward up to 140 miles (220 km). The minimum central pressure estimated from reconnaissance aircraft data is 985 mb (29.09 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: Hurricane conditions are expected in the hurricane warning area by early Monday, with tropical storm conditions beginning overnight. Tropical storm conditions will continue to spread northward over the tropical storm warning area along the Florida Gulf coast through tonight, and begin along portions of the tropical storm warning area along the Atlantic coast by late Monday. Tropical storm conditions are expected along the coast of South Carolina within the tropical storm warning area late Monday 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... Yankeetown, FL to Ochlockonee River, FL...6-10 ft Chassahowitzka, FL to Yankeetown, FL...4-6 ft Ochlockonee River, FL to Indian Pass, FL...4-6 ft Middle of Longboat Key, FL to Chassahowitzka, FL...3-5 ft Tampa Bay...3-5 ft Mouth of the St. Mary's River to South Santee River, SC...2-4 ft Middle of Longboat Key, FL to Englewood, FL...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: Tropical Storm Debby is expected to produce rainfall totals of 6 to 12 inches, with maximum amounts of 18 inches, across portions of central and northern Florida and southeastern North Carolina through Friday morning. This rainfall will likely result in areas of considerable flash and urban flooding, with significant river flooding expected. Across portions of southeast Georgia and South Carolina, 10 to 20 inches of rainfall, with local amounts to 30 inches, are expected through Friday morning. This potentially historic rainfall will likely result in areas of catastrophic flooding. For a complete depiction of forecast rainfall and flash flooding associated with Tropical Storm 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 central and northern Florida and southern Georgia tonight and Monday. The threat will spread northeastward into coastal Georgia and parts of South Carolina on Monday. SURF: Swells generated by Debby are expected to affect much of the Gulf coast of Florida through Monday. Swells will begin to affect the Southeast U.S. coast on Monday and continue through the middle 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 intermediate advisory at 200 AM EDT. Next complete advisory at 500 AM EDT. $$ Forecaster Brown |
