ZCZC MIATCDEP2 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION ANDRES DISCUSSION NUMBER 12 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL EP022009 800 AM PDT WED JUN 24 2009 THE CENTER OF ANDRES HAS BEEN EXTREMELY DIFFICULT TO FIND IN CONVENTIONAL SATELLITE IMAGERY. AN 0856 UTC AMSR-E MICROWAVE PASS WAS VERY HELPFUL IN LOCATING THE CENTER...HOWEVER A TRMM PASS ABOUT AN HOUR AND A HALF LATER SUGGESTED THAT THE CENTER WAS BECOMING ELONGATED AT THAT TIME. A MORE RECENT 1250 UTC QUIKSCAT PASS HAS PROVIDED MORE EVIDENCE THAT THE CENTER IS BECOMING ELONGATED AND LESS-DEFINED. THE HIGHEST BELIEVABLE WIND VECTOR FROM THE SCATTEROMETER WAS AROUND 30 KT...WHICH IS USED AS THE INITIAL INTENSITY ESTIMATE. ANDRES IS FORECAST TO CONTINUE WEAKENING...DUE TO NORTHEASTERLY SHEAR AND A MORE STABLE AIRMASS. SINCE THE CENTER OF THE CYCLONE IS BECOMING LESS DEFINED...DISSIPATION IS NOW EXPECTED LATER TODAY AND ANDRES SHOULD CONTINUE MOVING NORTHWESTWARD UNTIL THAT OCCURS. FORECAST POSITIONS AND MAX WINDS INITIAL 24/1500Z 20.3N 107.7W 30 KT 12HR VT 25/0000Z 21.0N 108.8W 25 KT...REMNANT LOW 24HR VT 25/1200Z...DISSIPATED $$ FORECASTER BROWN NNNN
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