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Hurricane Sally Public Advisory Number 21
2020-09-16 10:54:24| National Hurricane Center (Atlantic)
Issued at 400 AM CDT Wed Sep 16 2020 000 WTNT34 KNHC 160854 TCPAT4 BULLETIN Hurricane Sally Advisory Number 21 NWS National Hurricane Center Miami FL AL192020 400 AM CDT Wed Sep 16 2020 ...SALLY'S NORTHERN EYEWALL WITH HURRICANE CONDITIONS MOVING ACROSS THE GULF COAST FROM PENSACOLA BEACH FLORIDA WESTWARD TO DAUPHIN ISLAND ALABAMA... ...CATASTROPHIC AND LIFE-THREATENING FLOODING LIKELY ALONG PORTIONS OF THE NORTHERN GULF COAST... SUMMARY OF 400 AM CDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...30.1N 87.7W ABOUT 50 MI...75 KM SSE OF MOBILE ALABAMA ABOUT 40 MI...65 KM SW OF PENSACOLA FLORIDA MAXIMUM SUSTAINED WINDS...105 MPH...165 KM/H PRESENT MOVEMENT...NNE OR 20 DEGREES AT 3 MPH...6 KM/H MINIMUM CENTRAL PRESSURE...965 MB...28.50 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Hurricane Warning has been replaced with a Tropical Storm Warning from the Mississippi/Alabama border westward to the Mouth of the Pearl River. The Tropical Storm Warning west of the Mouth of the Pearl River has been discontinued. The Storm Surge Warning has been discontinued from the Mississippi/Alabama border to Fort Morgan, including portions of Mobile Bay. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Fort Morgan Alabama to the Walton/Bay County Line Florida A Hurricane Warning is in effect for... * Mississippi/Alabama border to the Okaloosa/Walton County line Florida A Tropical Storm Warning is in effect for... * East of the Okaloosa/Walton County line Florida to Indian Pass Florida * Mississippi/Alabama border to the Mouth of the Pearl River A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 12 hours in the indicated locations. 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 Hurricane Warning means that hurricane conditions are occurring somewhere within the warning area. Preparations to protect life and property should have been completed. A Tropical Storm Warning means that tropical storm conditions are occurring within the warning area. 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 400 AM CDT (0900 UTC), the center of the eye of Hurricane Sally was located an Air Force Reserve Hurricane Hunter aircraft and NOAA Doppler weather radars near latitude 30.1 North, longitude 87.7 West. Sally is moving toward the north-northeast near 3 mph (6 km/h). A north-northeastward to northeastward motion at a slightly faster forward speed is expected later today and tonight, followed by a faster northeastward motion on Thursday. On the forecast track, the center of Sally will approach the northern Gulf Coast this morning, and make landfall in the hurricane warning area later today. Sally is then expected to move inland across southeastern Alabama tonight. Recent data from An Air Force Reserve reconnaissance aircraft and the Mobile Alabama Doppler weather radar indicate that maximum sustained winds are near 105 mph (165 km/h) with higher gusts. Some slight increase in strength is possible before the center of Sally's eye makes landfall later this morning. Rapid weakening is expected after landfall occurs. Hurricane-force winds extend outward up to 40 miles (65 km) from the center and tropical-storm-force winds extend outward up to 125 miles (205 km). A sustained wind of 98 mph (157 km/h) and a gust to 116 mph (187 km/h) were recently measured by an elevated NOS CO-OP observing station in Fort Morgan, Alabama. A University of Florida weather tower located at Gulf Shores, Alabama, reported a sustained wind speed of 75 mph (121 km/h) and a gust to 93 mph (150 km/h). NOAA buoy 42012, located about 50 miles southeast of Mobile, Alabama, recently reported a sustained wind of 71 mph (115 km/h) and a pressure of 970.9 mb inside the eastern portion of Sally's eye. The estimated minimum central pressure based on the buoy data is 965 mb (28.50 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Sally can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml RAINFALL: Through this afternoon, Sally will produce additional rainfall totals of 8 to 12 inches with localized higher amounts possible along and just inland of the central Gulf Coast from west of Tallahassee, Florida to Mobile Bay, Alabama. Storm totals of 10 to 20 inches to isolated amounts of 35 inches is expected. Historic and catastrophic flooding is unfolding. In addition, this rainfall will lead to widespread moderate to major river flooding. Sally is forecast to turn northeastward after making landfall today and move across the Southeast through Friday, producing the following rainfall totals: Southern and central Alabama to central Georgia: 4 to 8 inches, with isolated maximum amounts of 12 inches. Significant flash and urban flooding is likely, as well as widespread minor to moderate flooding on some rivers. Western South Carolina into western and central North Carolina: 4 to 6 inches, with isolated maximum amounts of 9 inches. Widespread flash and urban flooding is possible, as well as minor to moderate river flooding. Southeast Virginia: 2 to 5 inches, with isolated maximum amounts of 7 inches. Scattered flash and urban flooding is possible, as well as scattered minor river flooding. STORM SURGE: The combination of a dangerous 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... Dauphin Island AL to Okaloosa/Walton County FL Line...4-7 ft Pensacola Bay and Choctawhatchee Bay FL...4-7 ft Mobile Bay...2-4 ft Okaloosa/Walton County Line to Walton/Bay County line FL...2-4 ft MS/AL Border to Dauphin Island AL...2-4 ft Walton/Bay County line to Chassahowitzka FL including Saint Andrew Bay...1-3 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and damaging 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. WIND: Hurricane conditions are spreading onshore within the hurricane warning area in Florida and Alabama. Tropical storm conditions will continue in portions of the warning areas through tonight. TORNADOES: A few tornadoes may occur today and tonight across portions of the Florida Panhandle, southern Alabama, and southwestern Georgia. SURF: Swells from Sally will continue to affect the coast from the Florida Big Bend westward to southeastern Louisiana 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 700 AM CDT. Next complete advisory at 1000 AM CDT. $$ Forecaster Stewart
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