Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
180 FXUS66 KPDT 301725 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 925 AM PST Sun Nov 30 2025 Updated Aviation Discussion .AVIATION...18z TAFs...Low clouds will linger over DLS, ALW, BDN, and RDM this morning, before giving way to sct mid-level clouds by the late afternoon at the latest. Otherwise, expect VFR conditions. Winds will be light and generally terrain-driven at less than 10 kts. Low clouds and fog may form overnight, particularly along the Columbia River, however confidence was too low to include any mention in the TAFs, as mid-level cloud coverage today may inhibit fog development. 74 && PREV DISCUSSION... /issued 323 AM PST Sun Nov 30 2025/ DISCUSSION...Snow is tapering off over the Blue Mountains as the upper-level low that induced light snow across much of central to eastern Oregon and southeast Washington exits to the southeast. In its wake, confidence is high (90 percent) that widespread low stratus accompanied by at least patchy dense fog will continue through this morning. Dry conditions are then anticipated into Monday afternoon as upper-level ridging noses into the Pacific Northwest. This will likely (70 percent confidence) result in another round of stratus and fog for basin areas tonight through Monday morning. Looking ahead, another shortwave embedded within northwesterly flow aloft is advertised for late Monday through Tuesday night. Snow chances are reduced across the Columbia Basin and Blue Mountain foothills (10-30 percent chance of measurable snow per NBM guidance) compared to the one that brought low-elevation snowfall to the Blue Mountain foothills yesterday evening into early this morning, but a better moisture tap should facilitate slightly better chances (15-30 percent) of advisory-level snow for the Blue Mountains. Ensemble guidance is now also suggesting some locally breezy westerly winds through the Cascades gaps on Tuesday. By the end of the week, ensemble solutions begin to diverge with regard to pattern details, specifically whether upper-level ridging will persist on Friday (~60 percent of members) or a more zonal pattern (~40 percent of members) will begin. By Saturday, a transition to a more zonal upper-level pattern is present among all ensemble clusters. As far as tangible weather, this would result in warmer, wetter, breezier conditions. Of note, EFI values ranging from 0.5-0.8 across the Columbia Plateau are pointing to decent ensemble agreement in windy conditions relative to model climatology. && .PRELIMINARY POINT TEMPS/POPS... PDT 37 22 39 29 / 0 0 0 40 ALW 36 25 37 31 / 0 0 10 50 PSC 39 24 37 27 / 0 0 0 30 YKM 41 24 38 26 / 0 0 0 20 HRI 38 25 37 29 / 0 0 0 30 ELN 39 22 37 26 / 0 10 10 20 RDM 40 19 49 27 / 0 0 0 10 LGD 39 21 42 31 / 0 0 0 40 GCD 38 21 46 31 / 0 0 0 30 DLS 44 30 42 35 / 0 0 10 30 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...86 LONG TERM....86 AVIATION...74