textproduct: Pendleton

KEY MESSAGES

- Dry conditions with warming temperatures through Wednesday. Cooler thereafter.

- Mountain showers and thunderstorms Wednesday, and again possibly Friday into Saturday.

- Breezy to windy conditions Wednesday and again Friday into Saturday.

DISCUSSION

An upper low continue to spin across Montana and southern Canada. It will gradually move eastward. As it does, the broader trough over the Pacific Nortwest will move as well, and weak ridging will move in for Tuesday.

A quick moving trough will then follow for Wednesday. This trough and associated upper level energy will bring a chance of showers, and a low (<20 percent) chance of thunderstorms, mainly to the mountains. Precip chances will continue into early Thursday, mainly for the eastern Oregon mountains. There will also be breezy to windy conditions as the trough moves through with wind gusts 25 to 35 mph with gusts as high as 40 mph in the normally breezy areas. NBM probabilities of wind gusts >=39 mph range between about 40 and 80 percent across the area.

A more zonal flow will move in for Thursday, drying things out. Then, an upper low and trough will move into the Pacific Northwest beginning on Friday. While the main upper low will likely move along the Washington/British Columbia border, the broader trough will move through the Pacific Northwest, with a more zonal flow returning Sunday. The main impacts will be showers and possibly thunderstorms over the mountains. Additionally, breezy to windy conditions will develop Friday afternoon over the lower elevations and peak on Saturday. Wind gusts of 35 to 35 mph with gusts to 40 mph are possibly in the normally breezy area...the Cascade gaps, Simcoe Highlands, Columbia Basin and Gorge, and foothills of the Blue Mountains. NBM probabilities of wind gusts >=39 mph range between 40 and 80 percent across this area on Friday, and about 50 and 80 percent on Saturday.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

VFR conditions prevail with light winds of 12 knots of less. Wind will be driven by terrain at times, especially in the early morning hours. No CIG or VIS issues expected.

Preliminary Point Temps/PoPs

PDT 48 81 50 79 / 0 0 0 0 ALW 52 81 54 81 / 0 0 0 0 PSC 51 85 52 84 / 0 0 0 0 YKM 53 84 54 82 / 0 0 0 20 HRI 50 84 51 82 / 0 0 0 0 ELN 48 79 52 76 / 0 0 0 30 RDM 41 82 49 74 / 0 0 0 10 LGD 44 79 46 79 / 0 0 0 20 GCD 42 83 46 79 / 0 0 0 20 DLS 57 87 60 78 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

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