325 
 WTPZ45 KNHC 152039
 TCDEP5
 TROPICAL STORM ISELLE DISCUSSION NUMBER  10
 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   EP102008
 200 PM PDT FRI AUG 15 2008
  
 ISELLE'S CONVECTIVE PATTERN HAS CONTINUED TO DETERIORATE TODAY DUE
 TO MODERATE TO STRONG EASTERLY UPPER-LEVEL SHEAR. HOWEVER...A
 15/1316Z QUIKSCAT OVERPASS INDICATED SOME CREDIBLE 35- TO 40-KT
 SURFACE WINDS IN THE SOUTHERN SEMICIRCLE. THEREFORE...THE INITIAL
 INTENSITY IS BEING MAINTAINED AT 35 KT SINCE THERE IS STILL SOME
 CONVECTION PRESENT IN THE SOUTHWESTERN QUADRANT. THE 34-KT WIND
 RADII HAVE ALSO BEEN LIMITED TO ONLY THE SOUTHWESTERN QUADRANT
 BASED ON THE QUIKSCAT WIND DATA AND CURRENT CONVECTIVE PATTERN.
  
 VISIBLE SATELLITE IMAGERY SUGGESTS THAT THE MOSTLY-EXPOSED LOW-LEVEL
 CIRCULATION HAS BEEN NEARLY STATIONARY FOR THE PAST 12 HOURS OR SO.
 HOWEVER...ALL NHC MODEL GUIDANCE INDICATES THAT A SLOW
 WEST-NORTHWEST OR WESTWARD MOTION IS EXPECTED TO RESUME DURING THE
 NEXT 12 HOURS AND CONTINUE THROUGHOUT THE FORECAST PERIOD. THE
 OFFICIAL FORECAST IS SIMILAR TO THE PREVIOUS FORECAST TRACK AND A
 LITTLE SOUTH OF THE NHC MODEL CONSENSUS.
  
 ALTHOUGH THE UPPER-LEVEL FLOW REMAINS DIFLUENT...20- TO 30-KT WINDS
 OVERSPREADING THE CYCLONE HAS CREATED MODERATE TO STRONG VERTICAL
 WIND SHEAR CONDITIONS. ALL AVAILABLE GUIDANCE SUGGESTS THAT THESE
 UNFAVORABLE UPPER-LEVEL WINDS WILL SLOWLY INCREASE THROUGHOUT THE
 FORECAST PERIOD...WHICH SHOULD INDUCE GRADUAL WEAKENING DURING THE
 NEXT 12 TO 24 HOURS.
 
  
 FORECAST POSITIONS AND MAX WINDS
  
 INITIAL      15/2100Z 17.6N 111.2W    35 KT
  12HR VT     16/0600Z 17.8N 111.8W    35 KT
  24HR VT     16/1800Z 18.0N 112.4W    30 KT
  36HR VT     17/0600Z 18.1N 113.2W    30 KT
  48HR VT     17/1800Z 18.3N 114.1W    25 KT...REMNANT LOW
  72HR VT     18/1800Z 18.5N 116.0W    20 KT...REMNANT LOW
  96HR VT     19/1800Z 18.5N 118.0W    20 KT...REMNANT LOW
 120HR VT     20/1800Z 18.5N 119.5W    20 KT...REMNANT LOW
  
 $$
 FORECASTER STEWART/BEVEN