174 
 WTNT45 KNHC 161454
 TCDAT5
 
 POST-TROPICAL CYCLONE IAN DISCUSSION NUMBER  17
 NWS NATIONAL HURRICANE CENTER MIAMI FL       AL102016
 1100 AM AST FRI SEP 16 2016
 
 Ian has transitioned into an extratropical low this morning.  Any of
 the remaining weak-to-moderate convection is the northern side of
 the circulation, with cold air wrapping into the center of the
 cyclone as it is overtaken by a cold front.  The initial intensity
 of 55 kt is based on ASCAT data.  Ian should move quickly
 northeastward and gradually weaken before a larger extratropical low
 absorbs it in about 2 days.  The track, intensity, and wind radii
 forecasts are based largely on guidance from the Ocean Prediction
 Center.
 
 
 FORECAST POSITIONS AND MAX WINDS
 
 INIT  16/1500Z 48.8N  36.2W   55 KT  65 MPH...POST-TROP/EXTRATROP
  12H  17/0000Z 54.0N  30.0W   50 KT  60 MPH...POST-TROP/EXTRATROP
  24H  17/1200Z 59.5N  22.5W   45 KT  50 MPH...POST-TROP/EXTRATROP
  36H  18/0000Z 64.5N  14.0W   45 KT  50 MPH...POST-TROP/EXTRATROP
  48H  18/1200Z...DISSIPATED
 
 $$
 Forecaster Blake