


Prognostic Meteorological Discussion
Issued by NWS
Issued by NWS
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252 FXAK02 KWNH 252331 PMDAK Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 731 PM EDT Fri Apr 25 2025 Valid 12Z Tue 29 Apr 2025 - 12Z Sat 03 May 2025 ...Overview... For much of next week, a mean upper low is forecast to waver near and over the Bering Sea, pinned in place by an Arctic ridge to the north and rounds of ridging over eastern Alaska and western Canada. Spokes of the trough may poke into western parts of the state at times. Meanwhile the storm track on the southern side of the upper low will lead to a cyclone approaching southeast AK and the AK Panhandle late next week, brining a heavy rain threat. ...Guidance/Predictability Assessment... Recent model guidance showed reasonable agreement. For the pressures, 500 hPa heights, and winds, a compromise of the 12z runs of the UKMET, GFS, and ECMWF were utilized with some weighting of the 12z NAEFS and 00z ECMWF ensemble means later on. The rest of the grids were more heavily weighted to the 19z NBM. ...Weather/Hazards Highlights... The pattern will be cloudy for much of the state, with the heaviest precipitation saved for south-central AK and the AK Panhandle late next week. Cooler than normal temperatures are likely for northern Alaska into the Yukon Flats through much of next week due to persistent flow around the southeast periphery of the Arctic ridge. Meanwhile warmer than average temperatures are expected for western Alaska and across much of the Interior early next week due to the persistent cloud cover. Anomalies will generally be warmer for morning lows relative to those for daytime highs. Southern coastal areas into Southeast Alaska should see near to above average lows and below average highs much of the period during rounds of wet weather. Roth/Tate Additional 3-7 Day Hazard Information can be found on the WPC medium range hazards outlook 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 $$