textproduct: Pendleton

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

KEY MESSAGES

- Warm and dry conditions through much of this week.

- Mountain showers and breezy to windy conditions possible by the weekend.

- Cooler and wetter pattern over the weekend.

DISCUSSION

Not much to discuss with satellite & radar with upper high pressure promoting dry and warm conditions through the next couple of days. High temperatures will persist in the upper 70s to lower 80s through Thursday (>90% chance). A potential for slight fire weather concerns develop around Thursday in association with a thermal trough. This allows slightly warmer temps with low min RH's across the region with values 20 to 30 percent with lower values of 10 to 20 percent across parts of Central Oregon (70-80% chance).

Heading into Friday, guidance is in good agreement that the ridge pushes off to the east with a trough/shortwave digging down into the PacNW, allowing a cooler/wetter pattern to develop. There's a struggle with how models want to handle the strength of the trough with only 53% of members strengthening the trough enough to bring mountain showers into the region. The introduction of the trough will bring strong pressure gradients with 10-12 mb developing on the GFS between Portland and Spokane between Friday and Saturday. NBM currently advertises 10-30% chances of wind advisory criteria (>45 mph gusts) across parts of the Columbia Basin, Simcoe Highlands, and Kittitas Valley. Strongest winds as of now look to develop near/at the Cascade gaps in the overnight hours of Friday to Saturday. Guidance remains fairly split how it handles the trough through the rest of the weekend, with 64% of members bringing the trough strong enough to bring mountain showers. At this time, most of the guidance suggests QPF amounts to not be significant with most QPF amounts less than 0.10 to 0.15 inches.

AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/

VFR conditions persist with high pressure promoting dry and calm conditions through the TAF period. Winds will be generally light and variable. No CIG or VIS issues expected.

Preliminary Point Temps/PoPs

PDT 79 46 79 48 / 0 0 0 0 ALW 80 51 80 53 / 0 0 0 0 PSC 80 45 80 46 / 0 0 0 0 YKM 79 49 80 50 / 0 0 0 0 HRI 81 45 80 45 / 0 0 0 0 ELN 77 46 77 48 / 0 0 0 0 RDM 84 41 82 40 / 0 0 0 0 LGD 83 46 84 46 / 0 0 0 0 GCD 85 48 88 49 / 0 0 0 0 DLS 84 51 84 53 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

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

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