ZCZC MIATCDEP4 ALL TTAA00 KNHC DDHHMM TROPICAL STORM NORMA DISCUSSION NUMBER 9 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 8 PM PDT SAT SEP 24 2005 EASTERLY SHEAR HAS CAUSED A DECREASE IN ORGANIZATION OF THE TROPICAL STORM THIS EVENING... WITH THE LOW LEVEL CENTER BECOMING EXPOSED TO THE EAST OF THE GENERALLY WEAKENING CONVECTION. THE INITIAL INTENSITY IS LOWERED TO 50 KT BASED ON A BLEND OF THE LATEST DVORAK T NUMBERS AND CURRENT INTENSITY ESTIMATES. THE SHIPS MODEL FORECASTS CONTINUED EASTERLY SHEAR AT ABOUT THE SAME MAGNITUDE AS IS CURRENTLY IMPACTING THE SYSTEM... THEREFORE LITTLE CHANGE IN STRENGTH IS INDICATED IN THE OFFICIAL FORECAST FOR THE NEXT 24 HOURS... FOLLOWED BY GRADUAL WEAKENING AS THE STORM BEGINS MOVING OVER COOLER WATERS AND UNDER CONTINUED MODERATE EASTERLY SHEAR. THE LOW LEVEL CENTER HAS BECOME ALMOST STATIONARY BUT SEEMS TO BE EDGING TOWARD THE NORTH AT ABOUT TWO KNOTS. THE CONVECTION TO THE WEST SHOULD SOON START DRAGGING THE LOW LEVEL CENTER ALONG...AND THE WEAK MID-LEVEL RIDGE TO ITS NORTH SHOULD INDUCE NORMA ALONG A GENERAL NORTHWESTWARD DIRECTION. A GRADUAL TURN TOWARD THE WEST AND EVENTUALLY WEST-SOUTHWEST IS FORECAST AS NORMA WEAKENS AND IS STEERED MORE BY THE LOW TO MID LEVEL FLOW OF A RIDGE EXPECTED TO DEVELOP TO ITS NORTHWEST. FORECASTER KNABB FORECAST POSITIONS AND MAX WINDS INITIAL 25/0300Z 16.8N 110.8W 50 KT 12HR VT 25/1200Z 17.4N 111.2W 50 KT 24HR VT 26/0000Z 18.3N 112.0W 50 KT 36HR VT 26/1200Z 19.2N 113.1W 45 KT 48HR VT 27/0000Z 20.2N 114.4W 45 KT 72HR VT 28/0000Z 20.5N 116.0W 35 KT 96HR VT 29/0000Z 20.0N 118.0W 30 KT 120HR VT 30/0000Z 19.5N 120.5W 20 KT...REMNANT LOW $$ NNNN
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Page last modified: Sunday, 25-Sep-2005 03:10:23 UTC