ZCZC MIATCDAT4 ALL TTAA00 KNHC DDHHMM TROPICAL STORM NICHOLAS DISCUSSION NUMBER 28 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 11 AM EDT MON OCT 20 2003 THE CENTER OF NICHOLAS IS NOW CLEARLY EXPOSED TO THE WEST OF DIMINISHING CONVECTION. ALTHOUGH DVORAK-BASED INTENSITY ESTIMATES ARE 45-55 KT...AN 8Z QUIKSCAT PASS INDICATES THAT THE WINDS ARE MORE LIKELY IN THE 35-40 KT RANGE. VERTICAL SHEAR IS EXPECTED TO GRADUALLY INCREASE OVER THE NEXT FEW DAYS AND SO CONTINUED WEAKENING IS FORECAST UNTIL THE SYSTEM DISSIPATES OR BECOMES ABSORBED INTO A FRONTAL ZONE. WITH THE DECREASE IN CONVECTION...THE LOW-LEVEL CENTER HAS NOW BEGUN TO MOVE WITH THE LOW-LEVEL FLOW. THE INITIAL MOTION IS NOW 290/4. MODEL GUIDANCE IS IN REASONABLE AGREEMENT ON A SLOW NORTHWESTERLY TRACK AROUND THE PERIPHERY OF A LOW- TO MID-LEVEL HIGH OVER THE SUBTROPICAL ATLANTIC...WITH A GRADUAL TURN TO THE NORTH IN ADVANCE OF THE NEXT MAJOR TROUGH FORECAST TO MOVE OFF NORTH AMERICA INTO THE ATLANTIC IN ABOUT 48-60 HOURS. THE OFFICIAL FORECAST IS CLOSE TO THE PREVIOUS ADVISORY AND IS IN BETWEEN THE GFS AND GFDL SOLUTIONS. HOWEVER...IF THE DEEP CONVECTION DOES NOT REDEVELOP... NICHOLAS COULD TAKE A TRACK TO THE WEST OF THE OFFICIAL FORECAST...AS SUGGESTED BY THE SHALLOW BAM. FORECASTER FRANKLIN FORECAST POSITIONS AND MAX WINDS INITIAL 20/1500Z 18.0N 48.5W 40 KT 12HR VT 21/0000Z 18.3N 49.1W 35 KT 24HR VT 21/1200Z 18.9N 50.0W 30 KT 36HR VT 22/0000Z 19.6N 50.9W 25 KT...DISSIPATING 48HR VT 22/1200Z 20.5N 52.0W 25 KT...REMNANT LOW 72HR VT 23/1200Z 23.0N 53.0W 25 KT...REMNANT LOW 96HR VT 24/1200Z 26.0N 53.5W 25 KT...REMNANT LOW 120HR VT 25/1200Z...DISSIPATED NNNN
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Page last modified: Monday, 07-Feb-2005 16:50:00 UTC