THE UPPER-LEVEL ENVIRONMENT IS EXPECTED TO BECOME MORE CONDUCIVE FOR STRENGTHENING DURING THE NEXT COUPLE OF DAYS AS ISAAC MOVES OVER THE WARM WATERS OF THE FLORIDA STRAITS AND EASTERN GULF. STEADY STRENGTHENING IS EXPECTED AND ISAAC IS EXPECTED TO BE AT OR NEAR HURRICANE STRENGTH WHEN THE CENTER REACHES THE FLORIDA KEYS. ADDITIONAL STRENGTHENING IS LIKELY WHILE THE CYCLONE MOVES OVER THE EASTERN GULF OF MEXICO. THE NEW INTENSITY FORECAST IS A LITTLE HIGHER THAN THE PREVIOUS ADVISORY AND IS BETWEEN THE SHIPS/LGEM GUIDANCE AND THE MORE AGGRESSIVE HWRF MODEL.
IT IS IMPORTANT NOT TO FOCUS ON THE EXACT FORECAST TRACK SINCE SIGNIFICANT HAZARDS EXTEND WELL AWAY FROM THE CENTER. SINCE LARGE UNCERTAINTIES REMAIN IN THE EXTENDED PORTION OF THE FORECAST...IT IS TOO EARLY TO DETERMINE EXACTLY WHERE AND WHEN ISAAC WILL MAKE LANDFALL ALONG THE GULF COAST.
FORECAST POSITIONS AND MAX WINDS
INIT 26/0300Z 22.1N 77.2W 50 KT 60 MPH
12H 26/1200Z 23.4N 79.4W 55 KT 65 MPH
24H 27/0000Z 24.6N 81.8W 65 KT 75 MPH...NEAR FLORIDA KEYS
36H 27/1200Z 25.8N 83.7W 75 KT 85 MPH
48H 28/0000Z 27.2N 85.2W 85 KT 100 MPH
72H 29/0000Z 29.5N 86.5W 90 KT 105 MPH
96H 30/0000Z 31.5N 86.5W 50 KT 60 MPH...INLAND
120H 31/0000Z 34.0N 86.0W 25 KT 30 MPH...INLAND
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