Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 601 PM EDT Sun Jun 28 2020 Valid 12Z Thu Jul 02 2020 - 12Z Mon Jul 06 2020 ...Guidance/Predictability Assessment... The WPC Alaskan medium range product suite for day 4/Thursday was primarily derived from a blend of reasonably well clustered solutions from the 12 UTC GFS/ECMWF/Canadian. Opted after collaboration with Alaskan offices to switch to an ensemble mean forecast plan days 5-8 in a period of rapidly growing system forecast spread/uncertainty. The 00 UTC ECMWF ensemble mean overall provided system developments more in line with a compromise of the varied models than the 12 UTC GEFS mean, but continuity is not stellar in either case. ...Overview and Weather/Hazard Highlights... A weakening system will be in the process of ejecting over the North slope and eastern Interior Thursday. Upstream, a Bering Sea system will also work inland to western/northwest AK Thursday and produce some organized rains. The weakening system will work inland and force another front eastward across the North Slope and Interior Friday, again with a chance to channel moisture and generate unsettled and showery conditions with passage. Meanwhile, a deeper low will lift slowly across the Bering Sea Friday-next Monday and present a maritime wind/wave hazard. A lead weather focusing front will be slow to shift over the Aleutians toward western/southwest AK and the AKpen, with eastward motion inhibited by a warming mainland upper ridge building over the extended holiday weekend. 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