Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 521 PM EST Sat Feb 13 2021 Valid 12Z Wed Feb 17 2021 - 12Z Sun Feb 21 2021 ...Weather/Hazards Highlights and Guidance/Uncertainty Assessment... Midweek upper troughing over the North Slope is expected to dig increasingly down into western Alaska later next week/weekend. This will support frontal cooling and unsettled conditions through this period to include some daily enhanced snow threats. This pattern offers average to above average predictability. To the south, there is also a good guidance signal that an amplified upper trough and deepened surface systems will work across the Gulf of Alaska Wed-Fri and act to weaken lead upper ridging. Expect flow will focus moderate to heavy precipitation mainly into southern and southeastern Alaska, especially over favored terrain. Upstream, increasingly progressive flow will subsequently feed across the Aleutians and Pacific to the Gulf by next weekend in a transitional pattern with gradually decreasing predictability for a series of systems with modest local focus. The WPC Alaskan medium range product suite was primarily derived from a composite blend of reasonably well clustered mid-larger scale guidance the 12 UTC GFS/ECMWF, GEFS/ECENS means and the 19 UTC National Blend of Models. Schichtel 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