ZCZC MIATCDEP2 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION BLANCA DISCUSSION NUMBER 21 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 8 PM PDT SAT JUN 21 2003 BLANCA IS HANGING ON BY A THREAD. IT IS PRODUCING SOME DEEP CONVECTION ON THE SOUTH-SIDE OF THE EXPOSED LOW LEVEL CENTER BUT CONTINUES TO BATTLE THE STRONG UPPER-LEVEL EASTERLIES. BLANCA IS OVER 28C WATER AND THE SHIPS INTENSITY GUIDANCE CONTINUES TO CALL FOR BLANCA TO REGAIN STORM STATUS. HOWEVER...GLOBAL MODELS SUGGEST THAT THE SHEAR SHOULD PERSIST FOR AT LEAST SEVERAL MORE DAYS...AND SO THE OFFICIAL FORECAST CALLS FOR A GRADUAL DECAY. THE LOW-LEVEL STEERING FLOW AROUND BLANCA REMAINS WEAK AND THE SYSTEM HAS DRIFTED TOWARD THE EAST DURING THE PAST 6 HOURS. HOWEVER...THE INITIAL MOTION REMAINS STATIONARY AND LITTLE NET MOTION IS EXPECTED WHILE THE SYSTEM WINDS DOWN. FORECASTER JARVINEN FORECAST POSITIONS AND MAX WINDS INITIAL 22/0300Z 15.6N 105.7W 25 KT 12HR VT 22/1200Z 15.6N 105.7W 20 KT...DISSIPATING 24HR VT 23/0000Z 15.6N 105.7W 20 KT...REMNANT LOW 36HR VT 23/1200Z 15.6N 105.7W 20 KT...REMNANT LOW 48HR VT 24/0000Z...DISSIPATED NNNN
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