Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
939 FXUS66 KPDT 192306 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 406 PM PDT Tue Aug 19 2025 Updated Aviation Discussion .AVIATION...00z TAFs...VFR conditions expected. Outside of some light cloud cover for sites along the Cascades, expect mostly clear skies and light, terrain-driven winds less than 10 kts. DLS will remain breezy during the daytime hours, gusting up to 25 kts at times out of the WNW. Evans/74 && .PREV DISCUSSION... /issued 212 PM PDT Tue Aug 19 2025/ DISCUSSION...Current satellite imagery shows mainly clear skies over the region with frontal boundary moving upstream offshore of the region, bringing few clouds over the WA Cascades. Otherwise, the weather will remain quiet and warm. Today-Thursday: The PacNW will be in between systems with the shortwave trough over the coast of British Columbia and the ridge building to our southeast. Through Wednesday, this synoptic pattern will help keep the high temperatures near-seasonable. Daytime RHs are slightly above critical thresholds since they will be in the 30s as well. With the high pressure system building over, temps will then slightly increase few degrees above normal Thursday as the RHs also begins trending downward. Winds will generally be light to breezy with gusts under 25 mph across the region. No fire weather concerns are to be anticipated for these days, given that the winds not overlapping as much with the low RHs. Friday onwards: Hot and drier conditions will return Friday into early next week as the high pressure system and dry airmass remain over our region. High temps may reach to the upper 90s across majority of the low elevations and low 100s over mainly Columbia Basin area, leading towards moderate to major HeatRisk. These temperatures may potentially warrant heat advisories for those days. Daytime RHs will continue trending downward into the teens and low 20s with winds remaining breezy. However, we are looking at low RHs and sustained winds of 15 mph or greater to overlap Friday from the Columbia River Gorge down to Central OR. That said, this could promote elevated fire weather concerns for those aforementioned areas as well but will continue to monitor for any changes. Thunderstorms may develop over the southern portion of the eastern mountains Sunday into Tuesday from the influence of the monsoonal moisture. However, chances are on the low-end (<30%) due to lack of moisture support and weak instability. Feaster/97 && .PRELIMINARY POINT TEMPS/POPS... PDT 57 86 54 89 / 0 0 0 0 ALW 62 87 59 90 / 0 0 0 0 PSC 59 89 53 91 / 0 0 0 0 YKM 59 87 54 88 / 0 0 0 0 HRI 61 89 55 91 / 0 0 0 0 ELN 57 81 51 87 / 0 0 0 0 RDM 47 84 47 90 / 0 0 0 0 LGD 54 84 51 89 / 10 0 0 0 GCD 52 86 52 91 / 0 0 0 0 DLS 62 86 57 93 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...97 LONG TERM....97 AVIATION...74