290 FXUS66 KPDT 041000 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 259 AM PDT Sat Nov 4 2017 .SHORT TERM...Today through Sunday Night...An upper level trough remains over the Pacific Northwest this morning. A disturbance that moved through the area yesterday has moved to the east and the flow aloft has shifted to the northwest. A few snow showers linger over the Blue Mountains but otherwise the area is in a lull before the next system moves through the area starting late this afternoon. Today should be dry in the lower elevations with increasing clouds through the day. A chance of mainly light snow showers will continue this morning in the Cascades and eastern mountains. By the afternoon, a warm front will begin to cross the Cascades and will bring additional snow showers to the Washington Cascades, the Yakima and Kittitas valleys and the Simcoe Highlands tonight. Already have a Winter Weather Advisory for snow for the East Slopes of the Washington Cascades and the Yakima and Kittitas Valleys for tonight and Sunday and have added the Simcoe Highlands. Snow levels in the advisory area will be starting out at 1500-2000 feet in the evening but will lower to the surface overnight and Sunday. The rest of the area will see precipitation increasing after midnight as the cold front crosses the Cascades overnight. Through Sunday afternoon, anticipate the Yakima and Kittitas Valleys getting 2-4 inches of snow, the Simcoe Highlands 4-6 inches and the East Slopes of the Washington Cascades 4-8 inches, which will impact travel through highway passes. See product PDXWSWPDT for additional information. Away from the advisory area, snow levels will begin at 2500-3500 feet and drop to around 1500-2000 feet. Precipitation will be lighter from the Columbia Basin eastward but the lower elevations could get a dusting of snow Saturday night and Sunday morning. Central Oregon, especially south and west of Bend could get 2-3 inches of snow. Sunday night there will continue to be a chance of mainly snow showers with snow levels near or at the surface over nearly the entire area. However, precipitation amounts will be greatly decreasing Sunday evening west of the eastern mountains. Some additional winter weather highlights may be need for Sunday through Monday morning for Wallowa county and perhaps the Blue Mountain Foothills but have held off for now as snow amounts are coming up a little short of the criteria and snow levels are a bit uncertain. High temperatures will be in the mid 30s to mid 40s today and a couple of degrees cooler on Sunday. Lows will be in the lower to mid 30s with 20s in the mountains tonight and in the mid 20s to around 30 with upper teens to mid 20s in the mountains Sunday night. Perry .LONG TERM...Monday through Saturday...The departing upper level trough will leave some lingering showers over the area Monday but then come to an end by evening. Ridge of high pressure will then set up over the region Tuesday and Wednesday for dry conditions. A new upper level trough will form in the eastern Pacific midweek and then move inland Thursday and Friday for a return to wet and unsettled conditions. Snow levels will be 2000 to 4000 feet. The trough exits late Friday leaving a flat westerly flow with some lingering showers mainly near the Cascades and over the eastern mountains on Saturday. && .AVIATION...Previous discussion...06z TAFS. Sct-bkn 040-070 overnight with isolated showers. Winds less than 10kt. Sct-bkn 040- 080 bkn-ovc 100-150 Saturday with a low pressure system approaching. Ceilings lowering to bkn-ovc 030-050 late afternoon and evening with rain developing. Winds 5-15kt. && .PRELIMINARY POINT TEMPS/POPS... PDT 44 33 41 30 / 20 40 80 60 ALW 45 34 42 30 / 20 40 80 60 PSC 46 34 40 30 / 10 50 80 50 YKM 41 30 36 24 / 10 90 80 40 HRI 46 33 42 29 / 10 50 80 50 ELN 40 27 36 19 / 20 90 90 40 RDM 41 28 40 24 / 10 40 70 40 LGD 41 29 39 27 / 20 30 80 70 GCD 38 29 38 26 / 10 20 80 60 DLS 48 35 44 31 / 20 80 80 50 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...Winter Weather Advisory from 5 PM PDT this afternoon to 4 PM PST Sunday for WAZ026-027-520-521. && $$ 83/91/91