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Hurricane Irma Public Advisory Number 46A
2017-09-10 19:57:42| National Hurricane Center (Atlantic)
Issued at 200 PM EDT Sun Sep 10 2017 000 WTNT31 KNHC 101757 TCPAT1 BULLETIN Hurricane Irma Intermediate Advisory Number 46A NWS National Hurricane Center Miami FL AL112017 200 PM EDT Sun Sep 10 2017 ...IRMA CONTINUES TO BATTER SOUTH FLORIDA... ...STRONGEST WINDS EXPECTED IN MARCO ISLAND/NAPLES AREA WITHIN THE NEXT COUPLE OF HOURS... SUMMARY OF 200 PM EDT...1800 UTC...INFORMATION ---------------------------------------------- LOCATION...25.6N 81.8W ABOUT 35 MI...55 KM S OF NAPLES FLORIDA ABOUT 70 MI...115 KM S OF FT. MYERS FLORIDA MAXIMUM SUSTAINED WINDS...120 MPH...195 KM/H PRESENT MOVEMENT...N OR 350 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...936 MB...27.64 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Cuba has discontinued the Hurricane Warning for the Cuban provinces of Matanzas and La Habana. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * South Santee River southward to Jupiter Inlet * North Miami Beach southward around the Florida peninsula to the Ochlockonee River * Florida Keys * Tampa Bay A Hurricane Warning is in effect for... * Fernandina Beach southward around the Florida peninsula to Indian Pass * Florida Keys * Lake Okeechobee * Florida Bay A Hurricane Watch is in effect for... * North of Fernandina Beach to Edisto Beach A Tropical Storm Warning is in effect for... * West of Indian Pass to the Okaloosa/Walton County Line * North of Fernandina Beach to South Santee River * Bimini and Grand Bahama A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 36 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. Interests elsewhere in the southeastern United States should monitor the progress of Irma. 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. For storm information specific to your area outside the United States, please monitor products issued by your national meteorological service. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 200 PM EDT (1800 UTC), the center of Hurricane Irma was located near latitude 25.6 North, longitude 81.8 West. Irma is moving toward the north near 12 mph (19 km/h), and a north-northwestward motion with a further increase in forward speed is expected later today, with that motion continuing through Monday. On the forecast track, the center of Irma should move near or over the southwest and west coast of the Florida Peninsula later today through tonight. Irma should then move inland over northern Florida and southwestern Georgia Monday afternoon. Maximum sustained winds are near 120 mph (195 km/h) with higher gusts. Irma is a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale. While weakening is forecast, Irma is expected to remain a powerful hurricane while it moves near or along the west coast of Florida. Hurricane-force winds extend outward up to 80 miles (130 km) from the center and tropical-storm-force winds extend outward up to 220 miles (350 km). A 62 mph (100 km/h) sustained wind and 99 mph (158 km/h) gust was recently reported at the Federal Aviation Administration station at Miami International Airport. An 81 mph (130 km/h) wind gust was recently reported at the Miami Weather Forecast Office/National Hurricane Center. The minimum central pressure reported by an Air Force Hurricane Hunter aircraft is 936 mb (27.64 inches). HAZARDS AFFECTING LAND ---------------------- 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 is expected to reach the following HEIGHTS ABOVE GROUND if the peak surge occurs at the time of high tide... Cape Sable to Captiva...10 to 15 ft Captiva to Ana Maria Island...6 to 10 ft Card Sound Bridge through Cape Sable, including the Florida Keys... 5 to 10 ft Ana Maria Island to Clearwater Beach, including Tampa Bay... 5 to 8 ft North Miami Beach to Card Sound Bridge, including Biscayne Bay... 3 to 5 ft South Santee River to Fernandina Beach...4 to 6 ft Clearwater Beach to Ochlockonee River...4 to 6 ft Fernandina Beach to Jupiter Inlet...2 to 4 ft North of North Miami Beach to Jupiter Inlet...1 to 2 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and destructive 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. The combination of a life-threatening storm surge and large breaking waves will raise water levels ABOVE NORMAL TIDE LEVELS by the following amounts within the hurricane warning area near and to the north of the center of Irma. Near the coast, the surge will be accompanied by large and destructive waves. WIND: Hurricane conditions are continuing across portions of the Florida Keys and southern Florida. Winds affecting the upper floors of high-rise buildings will be significantly stronger than those near ground level. Tropical storm and hurricane conditions are expected to spread northward across the remainder of the warning areas through Monday. Tropical storm conditions are expected to continue in portions of the warning area in the Northwestern Bahamas today. RAINFALL: Irma is expected to produce the following rain accumulations through Wednesday: Western Cuba...Additional 1 to 3 inches, isolated 5 inches. Western Bahamas...Additional 2 to 4 inches, isolated 6 inches. The Florida Keys...15 to 20 inches, isolated 25 inches. Western Florida peninsula...10 to 15 inches, isolated 20 inches. Eastern Florida peninsula and southeast Georgia...8 to 12 inches, isolated 16 inches. The rest of Georgia, the eastern Florida Panhandle, southern and western South Carolina, and western North Carolina...3 to 8 inches, isolated 12 inches. Eastern Alabama and southern Tennessee...2 to 5 inches. In all areas this rainfall may cause life-threatening flash floods and, in some areas, mudslides. TORNADOES: Tornadoes are possible through tonight, mainly across southern, central, and eastern portions of the Florida Peninsula. THE EYE: Do not venture outside when the calm eye of the hurricane passes over, as dangerous winds will return very quickly when the eye moves away. SURF: Swells generated by Irma are affecting the southeast coast of the United States. 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 500 PM EDT. $$ Forecaster Pasch
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