Inchelium, WA 99137 Weather

Key messages

- Valley rain and mountain snow showers through the week.

- Periods of light snow showers on the Cascade passes with minimal accumulations.

- Saturday is looking dry for Central Washington. Light rain chances increase over Idaho and Eastern Washington Saturday evening and night.

Synopsis

Low pressure will remain off the coast through Friday then eject inland over the weekend. Valley rain and mountain snow is forecast at times through the week with periods of light snow impacting the Cascade passes. The incoming system will bring increasing chances for light rain Saturday evening and night across Idaho and eastern third of Washington.

Discussion

Thursday through Sunday: A cool and unsettled pattern will continue the next few days as troughing lingers off the Pacific coast. Despite deep troughing, it will start to fill in, limiting the amount of precipitation that will fall. Showers will be limited to the northern mountains and Cascades with light snow above 2500-3000 feet. Accumulations in these areas will be minor, ranging from a dusting to an inch. Deepening SW flow Saturday and Sunday will bring plentiful cloud cover and chances for rain and high mountain snow, primarily to the eastern third of WA and north ID.

The forecast for Saturday evening looks potentially soggy, mostly east of Ritzville, with a 2050% chance of rain. The greatest probabilities will be in southeastern Washington and the southern Idaho Panhandle. Evening temperatures will fall into the low to mid 40s, accompanied by light northeast winds around 1-4 mph. The chance of seeing 0.25 inches or more of rain from 4 AM Saturday to 4 AM Monday is less than 10% west of Ritzville, 10-20% for eastern Washington and northern Idaho north of I-90, and 20-60% for areas south of I-90.

Monday through Thursday: Early next week will start off mostly dry, with high confidence in high pressure building into the region. A weak wave moving through northern BC and Alberta will bring a slight chance of sprinkles near the Canadian border on Tuesday. I am monitoring the potential for air stagnation in this pattern, as models indicate shallow boundary layers with light winds. By Tuesday, temperatures will climb 2 to 7 degrees above normal, reaching the 50s, and will remain there through at least Thursday. /DB

Aviation

06Z TAFS: VFR conditions expected for EAT/LWS/PUW. Monitoring potential for fog develop on the west plains that builds to the west in the Upper Columbia Basin and has a 40% chance of making into KMWH by 12z. Day time heating will allow for fog to dissipate around 17-18z if it formed around KMWH. KGEG-KSFF-KCOE have around a 40-50% chance for MVFR ceilings from 12-19z. There is a small chance for rain prior to 12z at KCOE as showers continue to move through the region tonight.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence in VFR conditions for EAT/LWS. Moderate confidence in MVFR ceilings for GEG/SFF/COE/PUW. Sites may remain VFR with a SCT deck or cigs just above MVFR.

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Confidence descriptors: Low - Less than a 30 percent chance Moderate - 30 to 70 percent chance High - Greater than a 70 percent chance

For additional probabilistic information for NWS Spokane airports, please refer to the Aviation Dashboard on our webpage: https:/www.weather.gov/otx/avndashboard

.Preliminary Point Temps/PoPs: Spokane 34 50 36 52 33 51 / 50 0 0 0 0 30 Coeur d'Alene 35 50 34 52 33 52 / 70 10 0 0 10 20 Pullman 36 52 36 51 32 52 / 40 10 0 0 10 30 Lewiston 40 56 39 55 37 54 / 30 10 0 0 10 30 Colville 34 48 34 51 27 52 / 40 30 0 10 0 20 Sandpoint 35 47 34 48 30 51 / 100 30 0 0 0 10 Kellogg 34 48 33 51 33 53 / 80 10 0 0 10 20 Moses Lake 33 53 36 52 28 53 / 0 0 0 30 0 10 Wenatchee 35 47 37 48 34 49 / 0 0 20 50 0 10 Omak 34 48 36 49 31 49 / 10 20 10 20 0 20

Watches, warnings and advisories

WA: None. ID: None.