Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 656 PM EST Wed Jan 27 2021 Valid 12Z Sun Jan 31 2021 - 12Z Thu Feb 04 2021 ...Overview and Guidance/Uncertainty Assessment... An upper level ridge that will initially be in place across western Alaska and the eastern Bering Sea on Sunday will gradually progress eastward and be over the Gulf of Alaska region by Tuesday/Wednesday. By the end of the forecast period, a rather pronounced upper level trough becomes established over the western Aleutians with some lead shortwave energy lifting northeastward ahead of it. The WPC Alaskan medium range product suite was derived from reasonably well clustered guidance from the 12 UTC GFS and ECMWF models for Sunday through Tuesday, along with the 19 UTC National Blend of Models and some of the ensemble means. For next Wednesday and Thursday, there was a gradual increase in using the GEFS/ECMWF ensemble means due to increasing deterministic model spread. ...Weather/Hazards Highlights... The next storm approaching from the western Aleutians early next week is expected to produce moderate precipitation and gusty winds across the Aleutians through Tuesday, and then likely reaching the southern mainland by the middle of next week. It appears that the moisture plume will be progressive enough to keep things from getting too heavy or persistent. For the Interior region, most of the forecast period should be dry and cold with perhaps a few light snow showers. Hamrick Hazards: No significant hazards are expected over Alaska during this forecast period. Additional 3-7 Day Hazard information can be found on the WPC medium range hazards chart at: https://www.wpc.ncep.noaa.gov/threats/threats.php WPC medium range Alaskan products including 500mb, surface fronts/pressures progs and sensible weather grids can also be found at: https://www.wpc.ncep.noaa.gov/alaska/ak_5dayfcst500_wbg.gif https://www.wpc.ncep.noaa.gov/alaska/akmedr.shtml https://www.wpc.ncep.noaa.gov/alaska/ak_5km_gridsbody.html