textproduct: Pendleton

KEY MESSAGES

- Light rain over the lower elevation areas and light high mountain snow Today.

- Breezy to locally gusty southerly winds across portions of central and northeast OR will continue through the weekend

- A train of upper low pressure systems will bring progressively cooler conditions across the forecast area, with light to locally moderate mountain snow accumulations, and potentially a dusting in portions of central OR

DISCUSSION

Will plan on canceling the wind advisories early as trends for obs in the Foothills of the Northern Blues as well as the the Grande Ronde Valley have fallen to about 20 mph sustained wind gusts to about 30 mph; no longer strong enough to warrant advisory. These breezy conditions are anticipated to be sustained through the afternoon. MRMS 24 hour surface precipitation estimates sub wetting rain amounts across much of the Lower Columbia Basin to upwards to a third of an inch across the Cascades crest, and also light amounts of one to two tenths across the northern Blues and Wallowas from the rains that ended yesterday morning and the new rains from the overnight. Currently light rain was falling at 3 am at PDT, as a surface cold front was pushing inland, forecast to stall out over the eastern mountains Tonight. NBM shows about 5 to 12 inches of snow well above 7000 ft in the the Wallowas through the end of this current weather maker, with only a dusting at pass levels in the the WA Cascades (White Pass Snoqualmie Pass) through Tonight.

The next wave of meaningful precipitation comes Tuesday Night, and Wednesday morning, tapering down over the eastern mountains Wednesday Night into Thursday morning. An initials swath of QPF along the Oregon Cascades Eastern Slopes of up to one tenth of an inch with rain or rain/snow and maybe one inch of snow accumulation above 3500 ft. Likewise snow amounts across the Wallowa Mountains around a couple of inches above 4000 ft are reasonable. Associated with this is colder temperatures that have been advertised going forward. Afternoon forecast highs in the Basin by Wednesday and Thursday are limited to to the upper 30s and 40s , and fairly homogeneous with the mountain zones by that time. Not much of a change is indicated by NBM temps going forward for the balance of the the 7 day forecast with a continued wet pattern due to the storm trains of of the eastern pacific.

AVIATION /18Z TAFS THROUGH 18Z MONDAY/

VFR conditions currently across all sites, which will continue through the period. The only exception will be at KPDT, where reduced visibilities of around 5SM will attribute to MVFR conditions this evening. Light rain is expected at most terminals through the afternoon, becoming dry by mid-to-late afternoon. Winds will also decrease through the period. 75

Preliminary Point Temps/PoPs

PDT 55 40 46 31 / 80 90 20 10 ALW 55 43 46 35 / 80 90 30 10 PSC 55 40 52 30 / 60 50 0 0 YKM 53 33 50 27 / 20 0 0 0 HRI 55 40 49 30 / 70 60 10 0 ELN 49 30 45 22 / 30 10 0 0 RDM 50 29 47 20 / 40 10 10 10 LGD 50 38 46 28 / 90 90 70 70 GCD 51 38 47 29 / 90 100 50 30 DLS 53 39 49 33 / 70 10 20 20

PDT WATCHES/WARNINGS/ADVISORIES

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