textproduct: Pendleton

KEY MESSAGES

- Freeze Warnings in place through 8 am

- Light mountain showers Sunday and Monday

- Warming and dry through the week

DISCUSSION

The HRRR model 850 mb level winds increase to about 10 knots in parts of the Columbia Basin; remaining light and variable around the Tri Cities, limiting mixing potential overnight. As of 1:30 am, a broad area form the Snake River/Columbia River confluence, to the Foothills of the Blue mountains have registered 34 degrees or colder on mesonet sites with locally freezing temperatures. Warmest areas Today will be found in the low 60s including the Yakima Valley, Lower Columbia Basin and the eastern Columbia River Gorge. Most other highland areas will see the mid to upper 50s. Temperatures are modeled a couple of degrees warmer for Sunday morning by the HREF and NBM mean, in the mid 30s with light wind. The probability for sub freezing temperatures are only in the 10% area for the similar areas and confidence for another freezing warning is far less than 50% as models indicate marginally more cloud cover. Sunday night and Monday will bring limited showers and no wetting rains, focused on mountain zones at 15-30% coverage. Snow levels around 4200-4600 ft AGL will drop to around 3800-4000 ft AGL near Snoqualmie Pass and the eastern mountains Sunday Night/Monday morning. Chances become more noticeable on Monday afternoon (20-30% chances) across the Cascades and eastern Mountains, (40-65% chances). From Tuesday onward, look for dry and progressively warmer highs each day into Saturday.

AVIATION /18Z TAFS THROUGH 18Z SUNDAY/

VFR conditions currently at all sites, which will stay the course through the period. Winds will stay light and below 10 kts, with broken ceilings of 25kft this evening. 75

Preliminary Point Temps/PoPs

PDT 58 33 62 39 / 0 0 0 10 ALW 60 38 62 42 / 0 0 10 10 PSC 64 36 67 40 / 0 0 0 10 YKM 63 37 67 38 / 0 0 10 10 HRI 63 34 66 40 / 0 0 0 0 ELN 58 33 62 36 / 0 0 10 10 RDM 58 26 59 29 / 0 0 0 0 LGD 55 30 57 33 / 10 0 10 10 GCD 55 28 56 32 / 0 0 10 10 DLS 66 40 69 43 / 0 0 10 10

PDT WATCHES/WARNINGS/ADVISORIES

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