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| #537726 (Received by flhurricane at: 8:03 PM 27.Aug.2012) TCPAT4 BULLETIN TROPICAL STORM ISAAC INTERMEDIATE ADVISORY NUMBER 27A NWS NATIONAL HURRICANE CENTER MIAMI FL AL092012 700 PM CDT MON AUG 27 2012 ...ISAAC EXPECTED TO BE A HURRICANE SOON...SIGNIFICANT STORM SURGE AND FLOOD THREAT FROM RAINFALL EXPECTED ALONG THE NORTHERN GULF COAST... SUMMARY OF 700 PM CDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...26.7N 86.5W ABOUT 230 MI...370 KM SE OF THE MOUTH OF THE MISSISSIPPI RIVER ABOUT 295 MI...470 KM SSE OF MOBILE ALABAMA MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...NW OR 305 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...981 MB...28.97 INCHES WATCHES 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 ALABAMA-FLORIDA BORDER... INCLUDING METROPOLITAN NEW ORLEANS...LAKE PONTCHARTRAIN...AND LAKE MAUREPAS A HURRICANE WATCH IS IN EFFECT FOR... * INTRACOASTAL CITY TO MORGAN CITY LOUISIANA A TROPICAL STORM WARNING IS IN EFFECT FOR... * FROM THE ALABAMA-FLORIDA BORDER TO THE AUCILLA RIVER * INTRACOASTAL CITY TO MORGAN CITY LOUISIANA A TROPICAL STORM WATCH IS IN EFFECT FOR... * EAST OF SABINE PASS TO WEST OF INTRACOASTAL CITY LOUISIANA 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 HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS. A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS. 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 48-HOUR OUTLOOK ------------------------------ AT 700 PM CDT...0000 UTC...THE CENTER OF TROPICAL STORM ISAAC WAS LOCATED BY AN AIR FORCE RESERVE RECONNAISSANCE AIRCRAFT NEAR LATITUDE 26.7 NORTH...LONGITUDE 86.5 WEST. ISAAC IS MOVING TOWARD THE NORTHWEST NEAR 10 MPH...17 KM/H...AND THIS GENERAL MOTION WITH A SLIGHT DECREASE IS FORWARD SPEED IS EXPECTED DURING THE NEXT DAY OR SO. ON THE FORECAST TRACK...THE CENTER OF ISAAC WILL MOVE OVER THE CENTRAL GULF OF MEXICO TONIGHT AND APPROACH THE COAST OF SOUTHEASTERN LOUISIANA AND MISSISSIPPI TUESDAY AFTERNOON OR TUESDAY NIGHT. MAXIMUM SUSTAINED WINDS ARE NEAR 70 MPH...110 KM/H...WITH HIGHER GUSTS. STRENGTHENING IS FORECAST...AND ISAAC IS EXPECTED TO BECOME A HURRICANE TONIGHT OR EARLY TUESDAY...AND CONTINUE TO STRENGTHEN UNTIL LANDFALL OCCURS ALONG THE NORTHERN GULF COAST. TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 205 MILES...335 KM FROM THE CENTER. THE ESTIMATED MINIMUM CENTRAL PRESSURE BASED ON REPORTS FROM AIR FORCE RESERVE AND NOAA RECONNAISSANCE AIRCRAFT IS 981 MB...28.97 INCHES. HAZARDS AFFECTING LAND ---------------------- STORM SURGE...THE COMBINATION OF A STORM SURGE AND THE TIDE WILL CAUSE NORMALLY DRY AREAS NEAR THE COAST TO BE FLOODED BY RISING WATERS. THE WATER COULD REACH THE FOLLOWING DEPTHS ABOVE GROUND IF THE PEAK SURGE OCCURS AT THE TIME OF HIGH TIDE... * SOUTHEAST LOUISIANA AND MISSISSIPPI...6 TO 12 FT * ALABAMA...6 TO 9 FT * SOUTH-CENTRAL LOUISIANA...3 TO 6 FT * FLORIDA PANHANDLE...3 TO 6 FT * FLORIDA WEST COAST INCLUDING APALACHEE BAY...1 TO 3 FT THE DEEPEST WATER WILL OCCUR ALONG THE IMMEDIATE COAST IN AREAS OF ONSHORE FLOW. 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 WEATHER SERVICE OFFICE. NEAR THE COAST...THE SURGE WILL BE ACCOMPANIED BY LARGE AND DANGEROUS WAVES. WIND...TROPICAL STORM CONDITIONS ARE EXPECTED TO SPREAD NORTHWARD INTO THE FLORIDA BIG BEND AREA AND THE FLORIDA PANHANDLE IN THE TROPICAL STORM WARNING AREA TONIGHT AND TUESDAY. TROPICAL STORM CONDITIONS ARE EXPECTED TO REACH THE NORTHERN GULF COAST IN THE HURRICANE WARNING AREA TONIGHT...WITH HURRICANE CONDITIONS EXPECTED BY TUESDAY AFTERNOON. RAINFALL...ISAAC IS EXPECTED TO PRODUCE ADDITIONAL RAIN ACCUMULATIONS OF 1 TO 3 INCHES OVER THE EASTERN FLORIDA PENINSULA...WITH ISOLATED STORM MAXIMUM TOTALS OF 15 TO 20 INCHES POSSIBLE. TOTAL RAINFALL AMOUNTS OF 6 TO 12 INCHES...WITH MAXIMUM AMOUNTS OF 18 INCHES...ARE POSSIBLE IN SOUTHEASTERN LOUISIANA... SOUTHERN MISSISSIPPI...SOUTHERN ALABAMA AND THE EXTREME WESTERN FLORIDA PANHANDLE. TORNADOES...ISOLATED TORNADOES ARE POSSIBLE ACROSS WEST-CENTRAL AND NORTHWESTERN FLORIDA THROUGH TONIGHT...AND ALONG THE NORTHERN GULF COAST LATE TONIGHT AND TUESDAY. SURF...DANGEROUS SURF AND RIP CURRENT CONDITIONS WILL CONTINUE TO AFFECT THE FLORIDA COASTLINE AND THE FLORIDA KEYS DURING THE NEXT DAY OR SO...AND BEGIN TO AFFECT PORTIONS OF THE NORTHERN GULF COAST TONIGHT. NEXT ADVISORY ------------- NEXT COMPLETE ADVISORY...1000 PM CDT. $$ FORECASTER BROWN/BLAKE |
