textproduct: Pendleton

KEY MESSAGES

- High Wind advisory still in effect through this evening in the Foothills of the OR Blues & Grande Ronde Valley area.

- Winter Weather Advisory for the WA Cascade Crests through Monday Morning.

- Valley Rain/Wintry Mountain weather will continue for the next few days. Drying out expected Thursday.

DISCUSSION

Radar shows a band of precipitation from the Kittitas Valley extending just south of The Dalles, of which some of is virga. Going forward we'll see mountain snow continue to develop across the Cascades with some low valley rain to compliment it. Winter Weather advisories in effect through Monday morning, with the heavier snow rates occurring in the evening hours tonight through the late morning hours of Monday. NBM shows 5 to 10 inches across areas below 5000 feet in WAZ522 with clusters show good agreement for moderate to heavy snow rates through the next 24-36 hours. At the same time, high wind warnings for the Northern Blue Foothills and Grande Ronde Valley with 40 to 50 knots continue to be the main threat through 10 PM. Pressure gradient tools show 5-8 MB difference between Baker City and Meacham.

A drier period will occur Thursday with the trough flattening, but the active period will continue next week with additional shortwaves passing through the area, bringing lower snow levels down to around 2000-2500 feet with mountain snow and possible wintry precipitation near the Foothills of the Blues (<20% chance). Deterministic models show a ridge pushing onshore of the PacNW, suggesting a drier period is currently forecasted for sometime mid-next week, however confidence is currently low to medium for this range.

AVIATION /18Z TAFS THROUGH 18Z MONDAY/

VFR conditions are expected, for the most part across the region. As more rain develops this evening, MVFR will redvelop at DLS, PDT and YKM (and possibly other sites).

Winds will generally be 10 kts or less, except at RDM and BDN where gusts to 25 kts are expected.

Preliminary Point Temps/PoPs

PDT 40 55 41 50 / 50 80 90 90 ALW 41 54 43 49 / 60 90 90 90 PSC 37 54 41 52 / 70 80 70 70 YKM 34 47 35 48 / 80 80 70 60 HRI 38 54 42 52 / 60 80 80 80 ELN 31 42 31 41 / 80 80 50 60 RDM 35 54 37 50 / 60 60 90 80 LGD 37 51 39 48 / 40 70 100 90 GCD 37 51 39 49 / 20 40 90 100 DLS 38 49 41 50 / 90 90 90 80

PDT WATCHES/WARNINGS/ADVISORIES

WA...Winter Weather Advisory until 10 AM PST Monday for WAZ522. OR...High Wind Warning until 10 PM PST this evening for ORZ049-507.