75
      Monday
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      Tuesday
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      Wednesday
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      4pm Update on Hurricane Isaac

      BULLETINHURRICANE ISAAC ADVISORY NUMBER 31NWS NATIONAL HURRICANE CENTER MIAMI FL AL092012400 PM CDT TUE AUG 28 2012...ISAAC GETTING BETTER ORGANIZED AS IT NEARS SOUTHEASTERNLOUISIANA...FLOODING FROM STORM SURGE AND RAINFALL EXPECTED...SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION----------------------------------------------LOCATION...28.7N 89.2WABOUT 30 MI...45 KM SSW OF THE MOUTH OF THE MISSISSIPPI RIVERABOUT 105 MI...170 KM SSE OF NEW ORLEANS LOUISIANAMAXIMUM SUSTAINED WINDS...80 MPH...130 KM/HPRESENT MOVEMENT...NW OR 310 DEGREES AT 8 MPH...13 KM/HMINIMUM CENTRAL PRESSURE...975 MB...28.79 INCHESWATCHES AND WARNINGS--------------------CHANGES WITH THIS ADVISORY...NONE.SUMMARY OF WATCHES AND WARNINGS IN EFFECT...A HURRICANE WARNING IS IN EFFECT FOR...* EAST OF MORGAN CITY LOUISIANA TO THE MISSISSIPPI-ALABAMA BORDER...INCLUDING METROPOLITAN NEW ORLEANS...LAKE PONTCHARTRAIN...AND LAKEMAUREPASA HURRICANE WATCH IS IN EFFECT FOR...* INTRACOASTAL CITY TO MORGAN CITY LOUISIANAA TROPICAL STORM WARNING IS IN EFFECT FOR...* THE MISSISSIPPI-ALABAMA BORDER TO DESTIN FLORIDA* MORGAN CITY TO CAMERON LOUISIANAA TROPICAL STORM WATCH IS IN EFFECT FOR...* EAST OF HIGH ISLAND TEXAS TO JUST WEST OF CAMERON LOUISIANAA HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTEDSOMEWHERE WITHIN THE WARNING AREA. PREPARATIONS TO PROTECT LIFE ANDPROPERTY SHOULD BE RUSHED TO COMPLETION.A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLEWITHIN THE WATCH AREA.A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS AREEXPECTED SOMEWHERE WITHIN THE WARNING AREA.A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS AREPOSSIBLE WITHIN THE WATCH AREA.FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITORPRODUCTS ISSUED BY YOUR LOCAL NATIONAL WEATHER SERVICE FORECASTOFFICE.DISCUSSION AND 48-HOUR OUTLOOK------------------------------AT 400 PM CDT...2100 UTC...THE CENTER OF HURRICANE ISAAC WAS LOCATEDBY NOAA DOPPLER RADARS NEAR LATITUDE 28.7 NORTH...LONGITUDE 89.2WEST. ISAAC IS MOVING TOWARD THE NORTHWEST NEAR 8 MPH...13 KM/H. ANORTHWESTWARD MOTION AT A SLIGHTLY SLOWER SPEED IS EXPECTED OVERTHE NEXT DAY OR TWO. ON THE FORECAST TRACK...THE CENTER OFHURRICANE ISAAC SHOULD REACH THE COASTLINE OF SOUTHEASTERNLOUISIANA THIS EVENING.MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 80 MPH...130 KM/H...WITH HIGHER GUSTS. ISAAC IS A CATEGORY ONE HURRICANE ON THE SAFFIR-SIMPSON HURRICANE WIND SCALE. SOME SLIGHT STRENGTHENING IS POSSIBLEBEFORE ISAAC MAKES LANDFALL. GRADUAL WEAKENING IS EXPECTED AFTERLANDFALL OCCURS.HURRICANE-FORCE WINDS EXTEND OUTWARD UP TO 60 MILES...95 KM...MAINLYTO THE NORTHEAST AND EAST OF THE CENTER. TROPICAL-STORM-FORCEWINDS EXTEND OUTWARD UP TO 185 MILES...295 KM. TROPICAL STORMCONDITIONS ARE OCCURRING ALONG THE COASTAL AREAS OF SOUTHEASTERNLOUISIANA...MISSISSIPPI...AND ALABAMA. NOAA BUOY 42040...LOCATEDEAST OF THE MOUTH OF THE MISSISSIPPI RIVER...RECENTLY MEASUREDSUSTAINED WINDS OF 63 MPH...100 KM/H...AND A GUST TO 83 MPH...135 KM/H.THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 975 MB...28.79 INCHES.HAZARDS AFFECTING LAND----------------------STORM SURGE...THE COMBINATION OF A STORM SURGE AND THE TIDE WILLCAUSE NORMALLY DRY AREAS NEAR THE COAST TO BE FLOODED BY RISINGWATERS. THE WATER COULD REACH THE FOLLOWING DEPTHS ABOVE GROUND IFTHE PEAK SURGE OCCURS AT THE TIME OF HIGH TIDE...* MISSISSIPPI AND SOUTHEASTERN LOUISIANA...6 TO 12 FT* ALABAMA...4 TO 8 FT* SOUTH-CENTRAL LOUISIANA...3 TO 6 FT* FLORIDA PANHANDLE...3 TO 6 FT* APALACHEE BAY...2 TO 4 FT* REMAINDER OF FLORIDA WEST COAST...1 TO 3 FTTHE DEEPEST WATER WILL OCCUR ALONG THE IMMEDIATE COAST IN AREAS OFONSHORE WINDS. SURGE-RELATED FLOODING DEPENDS ON THE RELATIVETIMING OF THE SURGE AND THE TIDAL CYCLE...AND CAN VARY GREATLY OVERSHORT DISTANCES. FOR INFORMATION SPECIFIC TO YOUR AREA...PLEASESEE PRODUCTS ISSUED BY YOUR LOCAL WEATHER SERVICE OFFICE. NEAR THECOAST...THE SURGE WILL BE ACCOMPANIED BY LARGE AND DANGEROUS WAVES.WIND...TROPICAL STORM CONDITIONS WILL CONTINUE TO SPREAD ACROSS THEWARNING AREA THIS EVENING...AND HURRICANE CONDITIONS SHOULD SPREADONSHORE ACROSS SOUTHEASTERN LOUISIANA DURING THE NEXT FEW HOURS.WINDS AFFECTING THE UPPER FLOORS OF HIGH-RISE BUILDINGS WILL BESIGNIFICANTLY STRONGER THAN THOSE NEAR GROUND LEVEL. AT ABOUT THE30TH STORY...WINDS WOULD LIKELY BE ONE SAFFIR-SIMPSON CATEGORYSTRONGER THAN AT THE SURFACE.RAINFALL...ISAAC IS EXPECTED TO PRODUCE TOTAL RAINFALL AMOUNTS OF7 TO 14 INCHES...WITH POSSIBLE ISOLATED MAXIMUM AMOUNTS OF 20INCHES...OVER MUCH OF LOUISIANA...SOUTHERN MISSISSIPPI...SOUTHERNALABAMA...AND THE EXTREME WESTERN FLORIDA PANHANDLE. THESE RAINSCOULD RESULT IN SIGNIFICANT LOWLAND FLOODING.TORNADOES...TORNADOES ARE POSSIBLE ALONG THE NORTHERN GULF COASTTHROUGH TONIGHT.SURF...DANGEROUS SURF AND RIP CURRENT CONDITIONS WILL CONTINUE TOAFFECT THE WEST COAST OF FLORIDA AND PORTIONS OF THE NORTHERN GULFCOAST FOR THE NEXT DAY OR SO.
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