textproduct: Pendleton

AVIATION

A VFR forecast for all terminals with only one caveat, that is the chance (30%) for VFR stratus but IFR fog development and visibility at YKM overnight. Winds remain under 10 knots at all terminals through the period. Russell/71

PREV DISCUSSION

/issued 323 AM PST Tue Jan 13 2026/

Key Messages...

- Air Stagnation Advisory from 7 AM today through 7 AM PST Friday

- Wind Advisory for Ladd and Pyles Canyons through 2 PM PST today.

DISCUSSION...Sensible, dry weather will continue into the next week and onward with this ridging pattern. Stagnant air conditions will also prevail, thanks to low mixing heights (below 1.5 kft) and weak transport winds (under 10 mph) at Kittitas and Yakima Valleys, Columbia Basin of WA/OR, the Gorge, north and central OR. That said, the air stagnation advisory will continue to last through early Friday morning. In addition to that, fog may redevelop with this high pressure aloft during early morning and overnight hours in the valley areas over the next few days, particularly in the Kittitas/Yakima Valley and portions of the Lower Columbia Basin of WA. Near to below freezing low temperatures and dew point depressions may also assist in bringing freezing fog. This can impact visibilities in those aforementioned areas as well, which could make traveling difficult during the early morning and overnight hours.

An wind advisory for Ladd and Pyles Canyons at the Grande Ronde valley will remain in effect until this afternoon. Wind gusts will exceed to 30-45 mph with the northwesterly flow aloft. The GFS, NAM, and SREF show pressure gradients of 4-7 mb for Baker (BKE)- Meacham (MEH) along with the HREF guidance favoring a 40-50% probability of wind gusts at 30 mph or higher. While the pressure gradients may decrease to 3-5 mb, these gusts could linger until around 2 PM or few hours after. Otherwise, the remaining forecast area will have mostly light winds with occasional breezes. Feaster/97

AVIATION...12Z TAFS...VFR conditions will continue through the TAF period for most sites. However, KYKM may see fog develop tonight whereas VSBY could drop to 1/2SM or lower thus bringing LIFR conditions (50% confidence). Winds will be less than 10kts. Feaster/97

PRELIMINARY POINT TEMPS/POPS

PDT 55 32 48 28 / 0 0 0 0 ALW 55 34 47 30 / 0 0 0 0 PSC 53 31 44 30 / 0 0 0 0 YKM 51 32 48 30 / 0 0 0 0 HRI 50 31 45 29 / 0 0 0 0 ELN 46 32 44 28 / 0 0 0 0 RDM 58 29 59 24 / 0 0 0 0 LGD 48 32 51 30 / 0 0 0 0 GCD 55 36 57 32 / 0 0 0 0 DLS 50 35 48 32 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

OR...Air Stagnation Advisory until 7 AM PST Friday for ORZ041-044-507- 508-510-511.

Wind Advisory until 2 PM PST this afternoon for ORZ049.

WA...Air Stagnation Advisory until 7 AM PST Friday for WAZ024-026>029- 521.

Dense Fog Advisory until noon PST today for WAZ026.