Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 637 PM EDT Tue Jun 09 2020 Valid 12Z Sat Jun 13 2020 - 12Z Wed Jun 17 2020 ...Overview and Weather Highlights/Threats... During the period /Sat-Wed/ across the region, a relatively progressive flow pattern is expected with a pair of storm systems to track across the North Pacific and Gulf of Alaska, while aloft, ridging builds and extends westward over the central to northern mainland. In between, relatively weak flow aloft will promote the development of isolated to scattered showers and thunderstorms, favoring the terrain areas and Brooks Ranges through this weekend. The Aleutians will see a couple potential rounds of precipitation and gusty winds, the first at the start of the period as one low pressure system passes across/near the island chain, and another by next Mon-Tue with the potential of a deeper/stronger system. For temperatures, above normal readings are expected through much of the period. Temperatures across the Interior may begin to warm further by early next week as upper ridging begins to expand across mainland Alaska. ...Guidance/Predictability Assessment... Initially, a higher component of the 12Z ECMWF and 12Z GFS was incorporated for Days 4-5 (Sat-Sun) with a quick transition to a heavily weighted ECENS and GEFS mean blend for Day 6-8. Forecast confidence is average to slightly above average with relatively good agreement in the later periods compared to recent runs. Taylor 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: - Much above normal temperatures across portions of mainland Alaska, Fri-Sun, Jun 12-Jun 14. 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