Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
444 FXUS66 KPDT 301201 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 401 AM PST Sun Nov 30 2025 .UPDATED AVIATION...12Z TAFs...Fog may have significantly decreased, but the low stratus layer with light snow/mist will be the main highlights for this mixture of flight categories (MVFR conditions or lower) for most sites except KDLS/KYKM/KPSC being VFR. KBDN will continue seeing light snow into this late morning (20-40% confidence). The low stratus layer may last through this late morning/early afternoon for KPDT, KRDM, KBDN, and KALW, which should begin dissipating by then. However, patchy fog may return this early morning for KDLS/KPDT/KALW/KPSC but will continue to monitor those areas. Winds will remain less than 10 kts. Feaster/97 && .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 22 39 29 41 / 0 0 40 60 ALW 25 37 31 38 / 0 10 50 60 PSC 24 37 27 39 / 0 0 30 20 YKM 24 38 26 43 / 0 0 20 10 HRI 25 37 29 42 / 0 0 30 40 ELN 22 37 26 42 / 10 10 20 10 RDM 19 49 27 47 / 0 0 10 10 LGD 21 42 31 41 / 0 0 40 80 GCD 21 46 31 43 / 0 0 30 60 DLS 30 42 35 49 / 0 10 30 20 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...86 LONG TERM....86 AVIATION...97