textproduct: Pendleton

KEY MESSAGES

- Freezing This Morning in the Columbia Basin and along the Blue Mountain foothills

- Slight chance of showers each day through Tuesday, mainly over the mountains

- Gradually warming to near or above normal through next week

DISCUSSION

Temperatures are looking to remain mostly above freezing for the balance of overnight and early this morning as temps as of 2 am look to be about 3 to 4 degrees warmer than the previous overnight at this time. Still isolated lower lying areas have touched freezing briefly, while areas around the Snake/Columbia river confluence, Ellensburg and Pendleton have seen temps between 30 and 32F. Temperatures this afternoon will reach the low to mid 60s across the Yakima valley and Columbia basin and at least the lower 50s into the foothills of the Blues. A broad surface inverted trough is noted with upper level flow aloft transitioning from weak cyclonic flow to more anticyclonic by Monday onward. Showers are expected across the Cascades range as early as Monday with areas like the Deschutes county being favored for snow above 5000 ft, and likewise the area of the eastern mountains on Monday afternoon. The cooler air aloft will lead to instability with 10-15% chances for thunderstorms (isolated) across the Blue Mountains embedded in more widely scattered showers. Diurnally breezy conditions on Monday and Tuesday through the Kittitas Valley and and the Eastern Columbia River Gorge/Columbia Basin. Mid to late week an upper level amplified ridge develops on the ensembles resulting in dry and warm weather rising through the 70s each afternoon.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

VFR conditions are again expected through this TAF period. Any clouds will be mid level (9,000 ft AGl) or higher, ensuring no restrictions, with light and variable surface winds.

Preliminary Point Temps/PoPs

PDT 62 39 65 41 / 0 0 10 0 ALW 62 42 65 45 / 10 10 20 10 PSC 67 41 71 44 / 0 10 0 0 YKM 67 39 69 41 / 10 10 0 0 HRI 66 41 69 44 / 0 0 0 0 ELN 62 36 64 40 / 10 10 10 0 RDM 59 30 61 31 / 0 10 0 0 LGD 57 33 59 36 / 10 10 40 20 GCD 56 32 58 34 / 10 0 40 10 DLS 69 44 67 45 / 10 10 0 0

PDT WATCHES/WARNINGS/ADVISORIES

WA...None. OR...None.