textproduct: Pendleton

DISCUSSION

A shortwave is currently making its way through Oregon, bringing rain in the lower valleys with snow/wintry mix in the Eastern Mountains and parts of the Blue Mountains. Up to a tenth of an inch has fallen in the Basin with higher QPF amounts in the WA Cascades. Precipitation will continue to push towards the SE with a more southern direction overnight. Heading into the afternoon hours today, the system will reverse course and begin to push from the SW to NE with a more warmer set-up compared to what we see currently and earlier in the night thanks to an incoming warm front. Thanksgiving Day will pave to be a more rain oriented event, with hints on light snow and wintry mix in the WA Cascades near the Kittitas Valley.

Snow levels will drop to 3500 to 4500 feet going through Friday as a cold front bringing light mountain snow back into the picture. QPF amounts don't look impressive with the latest NBM run showcasing up to 2 inches (40-60 percent chance confidence). Elsewhere, low valley rain will continue to develop with 30 to 50 percent PoPs through Friday evening. The cold front is expected to pass sometime late Saturday morning to early afternoon, with enough cold air to give 15 to 25 percent chances of snow in the Basin, giving us the first possible snow day in many parts of the low lying areas. Any accumulations is not expected to be great with the NBM barely showing trace amounts over the region (70 to 90 percent confidence). Regardless, low temperatures Saturday going into Sunday are expected to drop into the low to mid 20s over the region with high teens in parts of higher elevations lasting through Monday as well.

AVIATION...12Z TAFs

An advancing warm frontal zone later Today will promote a gradual deterioration of ceilings for the terminals through the TAF period. Light and variable winds to calm winds as ceilings across the area through the period. A relative lull to the rain at the terminals will give way certainly by afternoon as the east to west rain axis lifts north overspreading the Columbia Basin in the late afternoon and early evening. IFR will be common by the evening with lower ceilings becoming established during the overnight in the LIFR flight cat.

PRELIMINARY POINT TEMPS/POPS

PDT 48 35 46 35 / 40 50 40 70 ALW 46 37 46 38 / 50 60 60 80 PSC 45 36 46 36 / 10 50 50 70 YKM 45 35 45 35 / 10 50 70 70 HRI 47 36 46 37 / 20 50 50 70 ELN 42 32 41 33 / 10 70 80 80 RDM 52 27 57 33 / 30 0 10 20 LGD 46 35 49 35 / 70 50 30 60 GCD 50 33 56 34 / 50 20 10 30 DLS 48 40 48 42 / 60 60 80 90

PDT WATCHES/WARNINGS/ADVISORIES

OR...None. WA...Winter Weather Advisory until 4 AM PST early this morning for WAZ026-522-523.