Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
740 FXUS66 KPDT 280517 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 1017 PM PDT Wed Aug 27 2025 .UPDATED AVIATION...06Z TAFs...VFR conditions will persist through the forecast period. Winds will be mostly terrain driven overnight before becoming mostly westerly and below 12kts. CIGs will be mostly SKC with a few locations seeing OVC/BKN 25kft before clearing to FEW/SCT 25kft. Bennese/90 && PREV DISCUSSION... /issued 227 PM PDT Wed Aug 27 2025/ DISCUSSION...The monsoonal moisture will continue affecting our forecast area, fueling isolated thunderstorms across the WA Cascades and eastern mountains through this evening with mainly showers over the lowlands. Majority of the forecast area will have light precip with the mountain areas expecting localized heavy rainfall (30-40% chance). Based on the HREF 4-hr prob of thunder, there is also a 30- 50% chance for thunder to develop this afternoon over the Deschutes County and portions of Crook County. That said, CG lightning will be the main threat for today`s weather. Lingering haze may prevail across the lowlands through overnight from plumes of smoke from the fires over Idaho panhandle. Tomorrow, these storms will then tamper off northeastward outside of our area, leaving light showers behind over the WA Cascades and portions of the Wallowas. Thunderstorms may develop across these aforementioned areas in the afternoon hours, but chances are slight (<30%). We also may see RHs gradually decrease tomorrow as well starting over the southern part of Deschutes County, along with Crook County. By Friday, our forecast area should be relatively dry with RHs lowering again mainly to the 20s, though in the teens over Crook County. However with the low pressure system off the OR coast, the weak upslope flow will push light showers across Kittitas Valley over the weekend during morning hours (15-30% chance). Sunday afternoon onwards, the PacNW should remain dry. Winds will be mainly light with occasional breezes today through early next week. Feaster/97 && .PRELIMINARY POINT TEMPS/POPS... PDT 61 91 61 94 / 20 10 0 0 ALW 65 91 66 94 / 30 10 0 0 PSC 63 93 61 96 / 20 10 0 0 YKM 64 91 62 94 / 30 20 10 0 HRI 63 93 62 96 / 10 10 0 0 ELN 61 88 58 91 / 40 30 10 0 RDM 51 90 51 91 / 10 0 0 10 LGD 55 88 56 90 / 20 10 0 10 GCD 55 89 56 91 / 10 0 0 10 DLS 65 93 63 96 / 10 10 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...97 LONG TERM....97 AVIATION...90