Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
064 FXUS66 KPDT 240525 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 1025 PM PDT Mon Jun 23 2025 Updated Aviation Discussion .AVIATION...06z TAFs...VFR conditions expected. Skies will remain mostly clear overnight, save for some sct mid to high clouds for sites along the Cascades, before a weak front moving through the forecast area tomorrow afternoon makes for bkn-ovc cigs around 10 kft. No rain is expected with this front. Winds will be terrain- driven overnight, shifting more W/NW with the front tomorrow, with winds gusting around 20 kts at DLS. Evans/74 && PREV DISCUSSION... /issued 157 PM PDT Mon Jun 23 2025/ SHORT TERM...Today through Wednesday...Warm, benign weather persists for the duration of this term. High temperatures will steadily increase into the 80s and 90s through tomorrow. but cools by few degrees Wednesday into the 70s and 80s. And with temps remaining relatively warm, this decreases RH values to 15-30% thus making dry conditions last longer. This will bring moderate Heat Risk (level 2 of 4) over the Columbia Basin for Tuesday, given the low RHs and warming temps. However, critical conditions will not be met for this term. As the upper level trough remains over the forecast area, light showers could develop through Tuesday over the upper crest of the WA Cascades before expanding across the remaining crest of the Cascades Wednesday. Raw ensembles suggest a 30-60% probability for WA Cascades into tomorrow and <20% prob for OR Cascades Wednesday. Due to warm and dry conditions, there will not be enough moisture support. With the ongoing westerly flow, winds will be slightly breezy up to 15 mph through tomorrow across majority of the forecast area before steadily increasing to 25 mph tomorrow night into Wednesday at the Cascade Gaps. The raw ensembles favor a 30-70% probability for gusts at 30-35 mph over the Columbia River Gorge Wednesday afternoon into evening, so no concerns for wind advisories at this time. Feaster/97 LONG TERM...Thursday through Monday...Slight chance (<30%) of light showers for Thursday along mainly the WA Cascades. Otherwise, the warm, dry weather prevails Friday and beyond. As this heat surges, warm temperatures will continue trending into next week with RHs gradually dropping below 35%. Sunday into Monday, temps may reach into the 90s or higher with RHs at 15-25%. Confidence is 30-50% for temps reaching up to 100 degrees Monday over the Columbia Basin. Because of the excessive heat and dryness, Sunday and Monday will be our warmest and driest days of this period. This will also bring moderate Heat Risk across most of the forecast area Sunday and Monday as well, along with portions of the Lower Basin having pockets of major Heat Risk Monday. As of this time, no critical conditions is expected. Through Friday, the ongoing westerly flow will produce breezy to locally windy conditions over the Cascade Gaps during afternoon and early evening hours, particularly the Gorge. Chances are 30-50% for the Gorge to have gusts up to 30 mph. Other than that, winds will become light Friday night onwards. Feaster/97 && .PRELIMINARY POINT TEMPS/POPS... PDT 54 93 60 84 / 0 0 0 0 ALW 58 91 64 84 / 0 0 0 0 PSC 54 94 61 89 / 0 0 0 0 YKM 56 91 58 85 / 0 0 0 0 HRI 55 95 63 87 / 0 0 0 0 ELN 54 89 58 79 / 10 10 0 0 RDM 44 87 48 82 / 0 0 0 0 LGD 48 85 55 83 / 0 10 0 10 GCD 48 87 53 85 / 0 0 0 0 DLS 60 89 61 78 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...97 LONG TERM....97 AVIATION...74