785 FXUS66 KOTX 140545 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 945 PM PST Tue Dec 13 2022 .SYNOPSIS... A cold and drier pattern will set up this week. Freezing fog will persist for a couple more days. A round of light snow for Eastern Washington and the Idaho Panhandle will impact the Wednesday morning commute. Colder temperatures will end the week with highs in the teens and lows around zero. && .DISCUSSION... Evening update: Tonight and tomorrow: Light snow showers in the ID Panhandle/NE WA have been preconditioning the atmosphere for a light snow event tonight into tomorrow afternoon. The shortwave over Vancouver Island quickly moving SE should help bring a better chance of snow. As models depict it now, the chance for snow develops overnight over the northern mountains and expand south toward 12-18Z, largely comes across the east third of WA and ID, with much smaller chances toward the lee of the Cascades. Chances then shift toward southeast WA and the central/southern ID Pahandle after 18Z (10am) and dissipate into Wednesday evening. Snow amounts generally look light. Spokane/Cda area will see lower amounts due to the downsloping northerly flow (half an inch to an inch). The Palouse will see 1-2 inches of snow as northerly flow has a gentle upslope effect in the area. Sandpoint/Bonners Ferry area will get 1-2 inches. Eastern Panhandle and Camas Prairie area look to get 1-4 inches given the northerly flow. Impacts include slick roads and poor visibility. /Butler && .AVIATION... 06Z TAFS: Main aviation concern tonight into Wednesday will be LIFR/IFR conditions and chances for light winter precipitation in the form of light snow. Vicinity snow showers have been included for KGEG, KSFF, KCOE, and KPUW given current radar trends from 06Z to 12Z. There is a 10-20% chance for the aforementioned sites to experience light freezing drizzle from 06Z to 12Z before transitioning to all snow. A light glaze of ice may occur with the quick moving showers. Greatest risk for snow will be around KSZT, KCOE, KGEG, KSFF, KPUW, and KLWS from 12Z Wednesday to 00Z Thursday. LIFR probabilities for the aforementioned sites (except KLWS) and KMWH stand around 50-80% from 06Z Wednesday to 00Z Thursday then increase to 60-90% chance after 00Z Thursday. KLWS is one exception where there is a 50-60% chance of MVFR stratus after the snow ends. KEAT has a 90-100% chance of staying at VFR conditions through 06Z Thursday. /Butler && .PRELIMINARY POINT TEMPS/POPS... Spokane 21 27 15 24 9 21 / 10 50 0 0 0 10 Coeur d'Alene 23 28 18 27 14 23 / 10 50 0 0 0 10 Pullman 24 27 19 26 13 22 / 10 50 10 0 10 0 Lewiston 29 31 24 30 20 26 / 10 20 10 0 0 0 Colville 16 28 8 25 4 21 / 20 40 0 0 0 0 Sandpoint 23 27 20 27 15 22 / 20 50 0 0 0 10 Kellogg 26 29 19 28 15 23 / 20 40 10 0 0 10 Moses Lake 17 26 12 24 9 21 / 10 10 0 0 0 0 Wenatchee 21 27 17 25 14 22 / 0 10 0 0 0 0 Omak 18 26 14 25 12 21 / 20 20 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. && $$