Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
716 FXUS66 KPDT 090058 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 558 PM PDT Mon Sep 8 2025 .UPDATED AVIATION DISCUSSION... .AVIATION...00Z TAFs...VFR conditions prevail through the TAF period. Due to the upslope flow influenced by the closed low off California coast, this will induce more showers for most sites during this evening with isolated to scattered thunderstorms for KRDM/KBDN as well. While convection may weaken overnight, showers could linger tomorrow morning for KDLS/KPDT/KYKM. No convection is expected at this time for KPSC. Main threats to watch out for would be cloud-to-ground lightning and small hail. Gusty outflow winds (30-40kts) are potential, though with a slight chance (<20%). Feaster/97 && .PREV DISCUSSION... /issued 134 PM PDT Mon Sep 8 2025/ .DISCUSSION... An upper low, currently off the coast of northern California and southern Oregon will move onshore tonight into early Tuesday. This low and trough associated with it remain over the western states through much of the upcoming week before moving eastward Friday night into Saturday. Transient ridging will move over the area for Saturday before another trough possibly impacts the region early next week. With the upper low and trough, conditions look to be unsettled for much of the week. Thunderstorm chances are highest today through Wednesday, with highest chances today over central Oregon then across the higher elevations of central and eastern Oregon Tuesday and then the chances shift east on Wednesday to mainly eastern Oregon. However, by Wednesday, overall POPS increase as well with some areas seeing likely or higher chances. QPF values are fairly low today and Tuesday, mainly due to the nature of thunderstorms. However, by Wednesday, rain becomes more widespread and amounts, especially for the higher terrain from central Oregon to eastern Oregon will increase. Some of these areas will see QPF between 0.50 to 1.00 inch. THE ECMWF EFI does focus in on some anomalous QPF values on Tuesday, in central Oregon, with values in the 0.7 to 0.8 range and on Wednesday the 0.7 to 0.8 range is a bit more widespread. High temperatures will be around or slightly below normal through the week. && .PRELIMINARY POINT TEMPS/POPS... PDT 57 80 56 78 / 40 40 40 50 ALW 60 80 59 79 / 40 40 40 40 PSC 58 82 57 82 / 40 40 30 30 YKM 59 80 56 82 / 40 60 30 40 HRI 58 83 57 81 / 50 40 30 40 ELN 55 79 53 81 / 40 70 40 40 RDM 49 72 47 69 / 70 80 50 60 LGD 50 77 52 74 / 30 50 50 70 GCD 50 77 50 70 / 20 50 40 80 DLS 62 80 60 79 / 70 60 30 40 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...77 LONG TERM....77 AVIATION...97