Alaska Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
402 PM EDT Fri Aug 17 2018

Valid 12Z Tue Aug 21 2018 - 12Z Sat Aug 25 2018

Models show better than average agreement on the synoptic pattern
evolution affecting Alaska through the end of next week.  An
occluded cyclone rapidly approaching the south coast of Alaska
Tuesday will weaken rapidly as it moves across the inland high
terrain on Wednesday.  This will be followed by the next cyclone
moving eastward across the Bering Sea and making landfall across
southwest Alaska toward the end of next week.  A general model
consensus should yield a good starting point for finer
adjustments.  Therefore, the WPC Alaskan grid package was derived
using 55% 00Z ECMWF mixing in with the 12Z GFS and 06Z GEFS.  This
blend was then progressively weighted toward the 00Z EC mean and
06Z GEFS mean consensus for the longer range time frame.

Kong


WPC medium range Alaskan products including 500mb, surface
fronts/pressures progs and sensible weather grids can be found at:

http://www.wpc.ncep.noaa.gov/alaska/ak_5dayfcst500_wbg.gif
http://www.wpc.ncep.noaa.gov/alaska/akmedr.shtml
http://www.wpc.ncep.noaa.gov/alaska/ak_5km_gridsbody.html