Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 431 PM EST Fri Nov 27 2020 Valid 12Z Tue Dec 01 2020 - 12Z Sat Dec 05 2020 ...A pair of North Pacific storms are expected to move into Alaska Tuesday and Thursday with another large system moving southwest of the state late next week... A strong blocking ridge across Saskatchewan will force the flow across eastern and central Alaska to be southerly through the period, with low pressure areas impacting the state Tuesday (where guidance is agreeable) and Thursday (where timing issues are noted in the guidance). A significant storm is expected to move well to the southwest of the state late next week. This trio of cyclones is expected to keep seas across the northeast Pacific unsettled through the period with wet and windy conditions predominately for southeast sections of the state. The pressures, 500 hPa heights, and wind grids were deterministic based (12z Canadian, 12z UKMET, 12z GFS, and 12z ECMWF) from late Monday into Tuesday before increasing weights of the 12z NAEFS mean and 00z ECMWF ensemble mean were used thereafter. The remainder of the grids made greater use of the ensemble means. Much of the North Slope as well as the eastern two-thirds of the mainland should see above to well above normal temperatures through the period within the southerly flow regime with highest anomalies likely to be for lows (20F or more above normal in some cases). The Panhandle will tend to be above normal as well except for some below normal areas that are most likely early in the week. Expect the best potential for below normal temperatures over the west/southwest part of the mainland and through the Peninsula/Aleutians, in an area of persistent mid-level troughing. Roth 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: - Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Mon-Fri, Nov 30-Dec 4. - High winds across portions of mainland Alaska and the Aleutians, Mon, Nov 30. - High winds across portions of the Alaska Panhandle and mainland Alaska, Mon-Tue, Nov 30-Dec 1. 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