Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 619 PM EDT Mon Jun 29 2020 Valid 12Z Fri Jul 03 2020 - 12Z Tue Jul 07 2020 ...Guidance/Predictability Assessment... The WPC Alaskan medium range product suite for days 4-8 was primarily derived from a composite blend of reasonably well clustered solutions for most of the period from the 19 UTC National Blend of Models and the 12 UTC GFS/ECMWF/UKMET/Canadian, seemingly without need for diluting input from ensemble means. Model forecast spread is significantly reduced compared to the past few days and WPC continuity was good for this amplifying/blocky pattern with predictability rising into above normal territory. ...Overview and Weather/Hazard Highlights... A weakening Bering Sea system will work inland and force another front eastward across the North Slope and Interior Friday along with a chance to channel moisture and generate some unsettled and showery conditions with passage. Upstream, a deepened low will settle across the Bering Sea Friday-next Tuesday and present a protracted maritime wind/wave hazard in a developing flow blocky pattern. A lead weather focusing front will be slow to shift over the Aleutians toward western/southwest Alaska and the Alaskan Peninsula. The eastward motion will be inhibited by a warming mainland upper ridge building over the extended holiday weekend. The gradual westward shift of the summer ridge axis more into western and southwest Alaska into early next week leaves room for temperature moderating and unsettling upper trough digging from the Arctic and northwest Canada down through the eastern Interior and Southeast Panhandle. 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 Hazards: No significant hazards are expected over Alaska during this forecast period. 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