textproduct: Pendleton

KEY MESSAGES

- Precipitation will linger through Tuesday.

- Dry weather with warmer temperatures from midweek onward.

- Another system is possible next weekend.

DISCUSSION

Southwesterly flow will keep moisture flowing over the region through early Tuesday. This will bring rain to the lower elevations and snow to the mountains. Liquid equivalent QPF is about 0.25 to 0.50 inches overnight into Tuesday morning in the lower elevations and upwards of an inch in some of the mountain areas.

Snow levels will be rising to over 7000 feet in the Oregon Cascades and to above 6500 feet in the Blue Mountains. Levels will range from 2500 feet to around 5000 feet in the Washington Cascades. Any snow that does fall has been hard pressed to accumulate on road surfaces due to warm daytime temperatures and marginal overnight temperatures. Rising snow levels and continued marginal temperatures should continue this trend. Any accumulations at pass level should be minimal, with higher amounts at the crests.

ECMWF EFI QPF is 80th to 90th percentile through Tuesday across portions of the Columbia Basin, Blue Mountain Foothills and Blue Mountains. While amounts are not all that high, except for the Blue Mountains, the normals are low enough to account for these anomalies.

After Tuesday, the flow becomes more zonal, then a ridge builds in and precipitation ends and temperatures will warm into the mid to upper 50s in the lower elevations and 60 degrees can not be ruled out.

Breezy conditions are expected to develop Wednesday afternoon across portions of the Columbia Basin and the foothills of the Blue Mountains. Winds may gust to the 30 to 35 mph range. At this time, no wind headlines are anticipated.

Over the weekend, another system is possible which could bring more mountain snow and lower elevation rain, but guidance is in considerable agreement at this point.

AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/

Ceilings are expected to gradually deteriorate, especially overnight as precipitation winds down across the low lands and dew point depressions drop. NBM develops the greatest risk for IFR to VLIFR ceilings and visibility due to dense fog in the YKM and PSC/ALW/PDT areas. RDM and BDN could see IFR ceilings as well overnight and into Tuesday morning. Light and variable winds.

Preliminary Point Temps/PoPs

PDT 39 45 34 49 / 100 100 70 10 ALW 39 45 34 49 / 100 100 80 20 PSC 38 46 34 54 / 90 90 40 10 YKM 34 43 29 49 / 90 70 30 0 HRI 39 46 34 52 / 100 90 50 10 ELN 31 39 28 44 / 70 60 40 10 RDM 37 54 29 46 / 100 90 50 10 LGD 39 49 34 45 / 100 100 90 30 GCD 39 49 34 44 / 100 100 70 20 DLS 39 46 36 51 / 100 90 60 20

PDT WATCHES/WARNINGS/ADVISORIES

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