662 
 WTNT43 KNHC 161455
 TCDAT3
 
 HURRICANE GONZALO DISCUSSION NUMBER  17
 NWS NATIONAL HURRICANE CENTER MIAMI FL       AL082014
 1100 AM AST THU OCT 16 2014
 
 A NOAA Hurricane Hunter aircraft investigating Gonzalo measured an
 SFMR surface wind of 135 kt, but this observation was not supported
 by the flight-level winds, which were only as high as 126 kt
 in the northeastern quadrant, or SFMR data in subsequent passes in
 that portion of the storm. The initial intensity is raised to 125 kt
 on this advisory based on a compromise between the flight-level and
 SFMR data, as well as satellite intensity estimates that range from
 T5.5/102 kt from SAB and T6.6/130 kt from the UW-CIMSS ADT.
 
 Fluctuations in intensity are likely during the next 12-24 hours
 while Gonzalo remains in a relatively light-shear environment and
 over warm sea surface temperatures.  Some weakening is anticipated
 on Friday once the vertical shear begins to increase, but Gonzalo is
 not forecast to reach sub-26C water until about 48 hours.
 Therefore, the hurricane is expected to maintain major
 hurricane strength through the next 36 hours or so while it passes
 Bermuda, with more rapid weakening forecast after 48 hours.  The
 official forecast is a little higher than the previous one during
 the first 48 hours to account for the updated initial intensity.
 This forecast is close to the SHIPS and LGEM guidance for the next
 24 hours and then close to the intensity consensus thereafter.
 Gonzalo is still forecast to be a post-tropical cyclone by day 3
 while it passes near Newfoundland, and at that point it
 should also be very close to taking on frontal characteristics.
 Gonzalo should dissipate by day 5 while it moves eastward over the
 north Atlantic.
 
 The initial motion is 005/6 kt.  Gonzalo is moving a little slower
 than was previously forecast, which is having some downstream
 effects on the track forecast.  There is very little cross-track
 spread among the model guidance, but nearly all of the track models
 are slower than the previous forecast.  Gonzalo is moving northward
 to the east of a deep-layer trough over the eastern United States,
 and the hurricane should begin to accelerate north-northeastward
 ahead of this trough from this point forward.  Since this
 acceleration is somewhat delayed, the updated NHC track forecast is
 a little slower than the previous one, and lies close to TVCA
 and a GFS-ECMWF blend.
 
 The post-tropical portion of the forecast has been coordinated with
 the NOAA Ocean Prediction Center.
 
 FORECAST POSITIONS AND MAX WINDS
 
 INIT  16/1500Z 26.1N  68.6W  125 KT 145 MPH
  12H  17/0000Z 27.5N  68.0W  125 KT 145 MPH
  24H  17/1200Z 29.9N  66.6W  115 KT 130 MPH
  36H  18/0000Z 32.6N  64.9W  105 KT 120 MPH
  48H  18/1200Z 36.5N  62.4W  100 KT 115 MPH
  72H  19/1200Z 46.5N  50.5W   70 KT  80 MPH...POST-TROPICAL
  96H  20/1200Z 52.0N  29.0W   40 KT  45 MPH...POST-TROP/EXTRATROP
 120H  21/1200Z...DISSIPATED
 
 $$
 Forecaster Berg