textproduct: Pendleton

AVIATION...12z TAFs

Widespread MVFR and worse conditions will continue as a stagnant low stratus deck persists over the area. For sites outside of central Oregon, expect cigs to be less than 2 kft ovc through the period. For BDN/RDM, patchy fog will continue through the early morning, with weather models suggesting some clearing this afternoon, before the low cloud deck is expected to move back in later this evening. Confidence on this occurring is moderate at 50-60%, but would not be surprised if the current low cloud deck persisted for slightly longer than what models are suggesting at this time. 74

PREV DISCUSSION

/issued 257 AM PST Mon Jan 19 2026/

DISCUSSION...

A few patchy foggy spots this morning, mainly around and above 2500 ft EL such as Ryegrass Summit on I-90 and on I-84 Cabbage Hill/Deadmans Pass areas and occasionally Bend, have been seen on METARs/ mesonet stations. The patchy nature of it will preclude any headlines this morning.

The LREF mean 500 mb height pattern maintains/reinforces an amplified upper ridge along the PAC NW coast, maintaining northwest flow aloft across the PDT CWA. A resultant stagnant air mass pattern remains in place over the next several days as transport winds remains largely well below 10 mph. Additionally, the top of the well mixed layer is limited to around 1500 AGL each afternoon and a stagnation advisory remains in place through Tuesday morning.

High temperatures are nearly unchanged going forward this week with NBM highs in the mid and upper 30s across the low land areas, and more mild 40s to low 50s in the highlands/southern Blues/Central Oregon. Likewise overnight lows in the low 30s across the low lands with mid to upper 20s across the highlands.

A 38N/135W centered anticyclone is the models/ensembles focal point for an AR characterized by weak 250-400 kg/ms IVT late this week. In neither case (EC or GFS) does the AR move on land for the day 5/6 time frame as compared to 1 day ago in the models, with the latest NBM forecast now seeing delayed as well as reduced chances for precipitation across the WA Cascades late week into the weekend, with precipitation chances reaching 30% by Saturday and 50% by Sunday.

With snow levels around 2000ft and increasing to around 3000ft and higher Saturday into Sunday, low (5-8:1) SLR, lead to minor middle elevation snows (under 3 inches) Friday night though Sunday morning.

For week 2, the outlook is for a 33-50% chance for warmer than normal conditions and about a 33-40% chance for above normal precipitation (Jan 24th through January 28th).

PRELIMINARY POINT TEMPS/POPS

PDT 36 22 36 21 / 0 0 0 0 ALW 36 25 36 24 / 0 0 0 0 PSC 38 25 38 25 / 0 0 0 0 YKM 39 22 39 21 / 0 0 0 0 HRI 37 24 36 23 / 0 0 0 0 ELN 36 22 36 20 / 0 0 0 0 RDM 43 20 48 19 / 0 0 0 0 LGD 48 24 43 23 / 0 0 0 0 GCD 53 27 50 27 / 0 0 0 0 DLS 41 26 40 26 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

OR...Air Stagnation Advisory until 4 PM PST Tuesday for ORZ041-044- 507-508-510-511.

WA...Air Stagnation Advisory until 4 PM PST Tuesday for WAZ024- 026>029-521.