Area Forecast Discussion
Issued by NWS Spokane, WA

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000 FXUS66 KOTX 032220 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 220 PM PST Wed Mar 3 2021 .SYNOPSIS...
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A dry, warming trend is expected through the work week peaking on Friday with near record high temperatures possible in the Lewiston-Clarkston Valley and across southeast Washington up into the Spokane area on Friday. By the weekend, temperatures will cool back to seasonal normals along with an increasing threat for showers and breezy conditions. Temperatures and snow levels will drop further heading into next week with the possibility for snow showers returning down in the valleys.
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&& .DISCUSSION...
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Tonight through Friday: An upper trough off the coast will continue to provide southwest flow aloft through the period as the trough amplifies. This will result in a warming trend over Eastern Washington and north Idaho as 850mb temperatures continue to warm, reaching 5-8C on Friday. This will translate to highs in the upper 50s to low 60s over the Columbia Basin into the Spokane/Coeur d`Alene area, Silver Valley, and south into the palouse. The warmest spot will likely be the LC Valley with highs in the mid to upper 60s. Spokane, Pullman, and Lewiston are currently forecast to reach near record highs for March 5th. Over Central WA the warming aloft will be offset by increasing clouds as the front approaches. And there will even be a chance of rain and mountain snow Thursday night and Friday along the East Slopes of the Cascades, with a small threat around the Okanogan Valley and Highlands. JW Friday Night through Sunday: The back end of the ridge continues to shift eastward as a trough pushes it`s way into the Pacific coast. As the trough shoves inland, there will be southwesterly flow of moisture bringing precipitation to the Cascades. The cold front and incoming system will keep the precipitation mostly to the Cascades Friday night. Moving into early Saturday, the coverage will expand bring a chance for much of the Inland NW. Snow will be confined to the higher terrain and low lands will get light rain. By mid-day, the precipitation should clear out, leaving a dry wrap up to the weekend. Winds will be breezy, especially in the Blues, Palouse, and Basin, with gusts reaching up to 15-20KTs on Saturday. They will calm moving into Sunday as the cold front exits the region. As we move into the weekend, a cooling trend will begin dropping temperatures closer to seasonal normals each day. Weekend highs will be in the upper 40s to mid-50s. Lows near freezing in the low 30s for most. Monday through Wednesday: Models are showing a low building off the British Columbia coast. As the low moves southward, the trough drops into western US. Small shortwaves will bring more precipitation off and on. The cooling trend will continue into next week with temperatures much cooler than this week and back near-to-just below normal. This will bring the chance for both rain and snow, depending on the elevation and time of day. With dropping snow levels, the time of precipitation will be the determining factor of snow vs. rain. Models are varying in the timing and impact, so there is low confidence, but the snow will be light, if any. If any falls in the low lands, warming afternoon temperatures will melt it quickly as the day progresses. JS
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&& .AVIATION...
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00Z TAFS: VFR conditions expected with passing mid to high level clouds through the period. Winds will remain below 10 kts for most areas, except on the palouse including KPUW where a slightly enhanced easterly pressure gradient may bring 10-15 kt sustained winds at times. JW
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&& .PRELIMINARY POINT TEMPS/POPS...
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Spokane 31 56 36 60 37 48 / 0 0 0 0 20 20 Coeur d`Alene 28 54 33 60 35 46 / 0 0 0 0 10 30 Pullman 35 55 36 61 36 46 / 0 0 0 0 0 20 Lewiston 35 63 37 66 41 51 / 0 0 0 0 0 20 Colville 29 54 33 55 35 48 / 0 0 0 20 20 20 Sandpoint 30 51 32 53 36 45 / 0 0 0 10 10 40 Kellogg 33 53 36 57 36 43 / 0 0 0 0 0 40 Moses Lake 30 59 38 60 38 56 / 0 0 0 0 10 10 Wenatchee 33 54 38 53 36 51 / 0 0 10 10 20 10 Omak 30 53 38 52 37 51 / 0 0 0 20 20 10
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&& .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. && $$

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