052 FXUS66 KPDT 290521 AFDPDTArea Forecast Discussion National Weather Service Pendleton OR 1021 PM PDT Sun Sep 28 2025
.Updated for Aviation...
.AVIATION... 06Z TAFS...VFR conditions are generally expected through the TAF period. DLS briefly went to MVFR VSBYS earlier, when gusty winds brought in some HZ from regional wildfires. Additional similar episodes can not be ruled out.
Otherwise, expect dry conditions through mid to late afternoon Monday, when a cold front will move across the region and bring some rain chances.
DLS has had gusty winds to around 20 kts. These should subside overnight. Then winds should be generally 10 kts or less through Monday afternoon. Winds will increase during the afternoon hours with most locations in the 10 to 15 kt range and BDN and RDM gusting to around 20 kts, before decreasing toward evening.
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.PREV DISCUSSION... /issued 430 PM PDT Sun Sep 28 2025/
UPDATED AVIATION.
AVIATION...00Z TAFs...VFR conditions are expected to continue throughout the period. However, an unsettled weather pattern will push into the area towards the end of the period. Shower chances start to increase towards the last few hours of the period going into Monday afternoon. System will move just at the tail end of the period, so wasn`t confident if rain will begin before the period ends, so wound up putting PROB30 chances for most sites. Some cloud decks could drop down to 5000 feet with the heaviest showers possibly bringing brief MVFR conditions (5-15% chance). Winds will be light and variable for most sites, with speeds picking up as the front gets closer to the area. Higher winds are forecasted for RDM/BDN with gusts up to 20 knots by late morning/early afternoon Monday.
PREV DISCUSSION... /issued 338 PM PDT Sun Sep 28 2025/
DISCUSSION...Today through Tuesday: Current satellite and radar imagery show mostly clear skies across the forecast area with few clouds lingering. Warm and dry conditions prevail today, but with light to breezy winds over the Cascade Gaps and eastern mountains from the low-level upslope flow through this evening. Monday onward, the frontal system will move across the PacNW with widespread showers. The raw ensembles favor a 60-80% probability for amounts up to 0.15 inch over the WA/OR Cascades and 30-50% prob of rain amounts of 0.25 inch for the eastern mountains Monday. Tuesday seems to have the raw ensembles slightly lower with a 40-60% prob for 0.25 inch. Otherwise, the lower elevations will have 0.10 inch or less. This system will assist in bringing isolated thunderstorms upward across portions of the East Slope of OR Cascades and eastern mountains for Monday and then the Wallowas Tuesday (
NWS PDT Office Area Forecast Discussion