000 WTNT31 KNHC 010100 TCPAT1 BULLETIN HURRICANE ALEX INTERMEDIATE ADVISORY NUMBER 21B NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL012010 800 PM CDT WED JUN 30 2010 ...ALEX ABOUT TO MAKE LANDFALL IN NORTHEASTERN MEXICO... SUMMARY OF 800 PM CDT...0100 UTC...INFORMATION ---------------------------------------------- LOCATION...24.3N 97.5W ABOUT 40 MI...65 KM NNE OF LA PESCA MEXICO ABOUT 110 MI...180 KM S OF BROWNSVILLE TEXAS MAXIMUM SUSTAINED WINDS...100 MPH...155 KM/HR PRESENT MOVEMENT...W OR 270 DEGREES AT 10 MPH...17 KM/HR MINIMUM CENTRAL PRESSURE...948 MB...27.99 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A HURRICANE WARNING IS IN EFFECT FOR... * THE COAST OF TEXAS SOUTH OF BAFFIN BAY TO THE MOUTH OF THE RIO GRANDE * THE COAST OF MEXICO FROM THE MOUTH OF THE RIO GRANDE TO LA CRUZ A TROPICAL STORM WARNING IN IN EFFECT FOR... * THE COAST OF TEXAS FROM BAFFIN BAY TO PORT OCONNOR * THE COAST OF MEXICO SOUTH OF LA CRUZ TO CABO ROJO THE HURRICANE WARNING FOR THE TEXAS COAST WILL LIKELY BE CHANGED TO A TROPICAL STORM WARNING LATER THIS EVENING. 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 UNITED STATES...PLEASE MONITOR PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ AT 800 PM CDT...0100 UTC...THE EYE OF HURRICANE ALEX WAS LOCATED BY A RECONNAISSANCE AIRCRAFT AND NATIONAL WEATHER SERVICE RADAR FROM BROWNSVILLE NEAR LATITUDE 24.3 NORTH...LONGITUDE 97.5 WEST OR ABOUT 15 MILES...25 KM...EAST OF THE COAST OF NORTHEASTERN MEXICO. ALEX IS MOVING TOWARD THE WEST NEAR 10 MPH...17 KM/HR. THIS GENERAL MOTION IS EXPECTED TO CONTINUE UNTIL LANDFALL IN NORTHEASTERN MEXICO IN A COUPLE OF HOURS. ON THE FORECAST TRACK...ALEX WILL BE MOVING OVER NORTHEASTERN MEXICO ON THURSDAY. MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 100 MPH...155 KM/HR...WITH HIGHER GUSTS. ALEX IS A CATEGORY TWO HURRICANE ON THE SAFFIR-SIMPSON HURRICANE WIND SCALE. LITTLE CHANGE IN STRENGTH IS LIKELY PRIOR TO LANDFALL. WEAKENING IS LIKELY AFTER THE CENTER CROSSES THE COASTLINE...AND ALEX IS EXPECTED TO DISSIPATE OVER MEXICO WITHIN 1 TO 2 DAYS. ALEX IS A LARGE TROPICAL CYCLONE AND HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 70 MILES...110 KM...FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 205 MILES...335 KM PRIMARILY TO THE NORTHEAST OF THE CENTER. LATEST MINIMUM CENTRAL PRESSURE REPORTED BY AN AIR FORCE HURRICANE HUNTER AIRCRAFT WAS 948 MB...27.99 INCHES. HAZARDS AFFECTING LAND ---------------------- RAINFALL...ALEX IS EXPECTED TO PRODUCE TOTAL RAINFALL ACCUMULATIONS OF 6 TO 12 INCHES OVER PORTIONS OF NORTHEASTERN MEXICO AND SOUTHERN TEXAS...WITH ISOLATED MAXIMUM AMOUNTS OF 20 INCHES. THESE RAINS COULD CAUSE LIFE-THREATENING FLASH FLOODS AND MUD SLIDES... ESPECIALLY OVER MOUNTAINOUS TERRAIN. WIND...HURRICANE-FORCE WINDS HAVE REACHED THE COAST WITHIN THE HURRICANE WARNING AREA OVER NORTHEASTERN MEXICO. STORM SURGE...A DANGEROUS STORM TIDE WILL RAISE WATER LEVELS BY AS MUCH AS 4 TO 6 FEET ABOVE GROUND LEVEL ALONG THE IMMEDIATE COAST TO THE NORTH OF WHERE THE CENTER MAKES LANDFALL. THE WATER COULD PENETRATE INLAND AS FAR AS SEVERAL MILES FROM THE SHORE WITH DEPTH GENERALLY DECREASING AS THE STORM TIDE MOVES INLAND. NEAR THE COAST...THE SURGE WILL BE ACCOMPANIED BY LARGE AND DESTRUCTIVE WAVES. TORNADOES...ISOLATED TORNADOES ARE POSSIBLE OVER PORTIONS OF EXTREME SOUTHERN TEXAS OVERNIGHT. NEXT ADVISORY ------------- NEXT COMPLETE ADVISORY...1000 PM CDT. $$ FORECASTER PASCH/BERG