Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
955 FXUS66 KPDT 281712 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 1012 AM PDT Thu Aug 28 2025 .Updated for Aviation .AVIATION... 18Z TAFS...VFR conditions and light winds are expected at all TAF sites. There is a low (<20%) chance of thunderstorms at YKM and (15%) at BDN and RDM this afternoon. Since the chances are very low, will not include in the individual terminals at this time. After today, thunderstorm chances are basically zero through the next few days. && .PREV DISCUSSION... /issued 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 93 62 93 / 0 0 0 0 ALW 66 94 66 96 / 0 0 0 0 PSC 61 96 61 96 / 0 0 0 0 YKM 62 94 62 95 / 10 0 0 10 HRI 62 96 62 96 / 0 0 0 0 ELN 58 93 59 93 / 10 0 0 10 RDM 51 91 52 90 / 0 0 10 0 LGD 56 91 56 92 / 0 0 0 0 GCD 56 91 57 94 / 0 0 10 0 DLS 64 96 64 91 / 0 0 0 10 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...97 LONG TERM....97 AVIATION...77