textproduct: Pendleton

UPDATED AVIATION

PREV DISCUSSION

/issued 222 PM PST Sat Jan 17 2026/

DISCUSSION...

Key Messages...

1. High pressure will remain through much of next week.

2. Air stagnation, fog and freezing fog will continue as a result of the high pressure.

3. By the middle of next week, the the high should break down and we will see the first precipitation chances in awhile.

Strong high pressure will remain over the western CONUS through much of next week. The high will reposition itself over the course of the week, but ultimately the impacts are the same...fog/freezing fog and stagnant air, with dry conditions otherwise. Some areas will see stratus rather than fog, but until the high loses its grip on the area, there will be very little in the way of change.

Patchy dense fog remains around, especially in central Oregon, so have opted to leave the freezing fog advisory in effect, especially since more is expected overnight.

By midweek, the high should begin to break down a little with further erosion by Thursday into Friday. By late week, a trough is expected to bring precipitation to the Pacific Northwest with snow in the mountains and a low (20-30 percent) chance of precipitation in the lower elevations. Ultimately, should be all rain in the lower elevations, but if enough cold air remains there could be some precipitation type issues at the onset but high temperatures are expected to be above freezing.

AVIATION... 00Z TAFs...Low stratus and areas of fog continue to dominate over the region with high pressure preventing mixing. These conditions will persist through the overnight hours before there is relief by late morning/early afternoon. RDM/BDN are both seeing LIFR conditions due to FZFG. DLS/YKM/ALW/PSC are all MVFR due to low CIGs of 1500-2000 ft decks and PDT is IFR due to CIGs below 600 ft. These conditions will continue through the forecasted period. 90

PRELIMINARY POINT TEMPS/POPS

PDT 25 34 23 36 / 0 0 0 0 ALW 29 34 25 36 / 0 0 0 0 PSC 27 36 25 38 / 0 0 0 0 YKM 27 38 23 39 / 0 0 0 0 HRI 26 35 24 37 / 0 0 0 0 ELN 26 37 22 36 / 0 0 0 0 RDM 23 42 18 44 / 0 0 0 0 LGD 31 47 25 48 / 0 0 0 0 GCD 32 52 27 53 / 0 0 0 0 DLS 30 40 27 41 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

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

Freezing Fog Advisory until noon PST Sunday for ORZ502-507-510- 511.

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