Current Outlook

5/14/2021 Warm weekend, becoming cooler next week

“Ridging continues to dominate the weather pattern in the Pacific Northwest through the weekend. Temperatures warming to near 80 for parts of the I-5 Corridor and into the 90s for parts of the Columbia Basin are expected. The coast is likely to stay cooler thanks to semi-persistent low level cloud cover. Temperatures moderate somewhat Monday with a cold front moving in Tuesday to push the ridge out and bring in unsettled weather for the remainder of the forecast period...”

Recent Outlooks

5/10/2021 Dry week with possible showers this weekend

“Warmer temperatures are forecast this week thanks to a ridge of high pressure building over the region. Northwesterly flow at the surface and aloft may keep increased cloud cover over parts of Western Washington, otherwise mostly clear skies are expected. Wednesday, a shortwave trough transits British Columbia and may bring a few showers to mainly mountain regions north of US 2 and breezy conditions to typical windy spots statewide. A more zonal pattern following the shortwave should put a cap t..”

5/7/2021 Unsettled weekend followed by warming conditions next week

“An upper level trough is working it's way into the region. It is likely to park over the Northern Rockies for most of the weekend. Cool temperatures aloft and a few weak disturbances in the mean flow may allow for some shower activity in Western Washington, the Palouse, and mountain regions through Sunday evening. The trough remains stalled for the beginning of the week to keep northwesterly flow aloft, but a building ridge along the coast should help to dry out the state. A shortwave trough may..”

5/3/2021 Dry conditions Tue & Wed, becoming more active Thursday through the weekend

“A weak cold front will cross the state this evening and overnight followed by a weak ridge that forecast to transit the Pacific Northwest on Tuesday and Wednesday to bring mostly dry conditions to Washington. A warming trend is expected to coincide with this ridge, with the warmest day being Wednesday west of the Cascades and Thursday to the east. Clouds begin to increase in Western Washington on Wednesday with a cold front entering the region overnight. This front will move west to east bringin..”

4/30/2021 Off and on wet weather west of the Cascades, mainly dry in the east

“A cold front working its way across the state is bringing an end to this week's early season heat wave. Rain showers are expected in Western Washington and mountainous areas through the weekend while lowland Eastern Washington should remain dry with breezy areas. The whole state sees a break from the rain Sunday before another cold front moves in. Again, Western Washington and mountainous areas can expect some rain showers with arid regions staying dry. A ridge briefly builds over the region for..”

4/26/2021 Warm week followed by a cooler weekend

“A ridge building over the west coast is expected to keep most of the state dry through at least Thursday aside from a few possible showers generally north of Mount Vernon and west of the Cascades resulting from a weak disturbance forecasted to transit British Columbia Tuesday and Wednesday. A warming trend is expected, with parts of Eastern Washington getting close to 90 on Thursday. Friday, the ridge begins to break down with an incoming frontal boundary to bring cooler temperatures and a chanc..”

4/23/2021 Active weekend, lasting into the week

“Clouds will continue to increase Friday night as a cold front moves from west to east across the state. Rain and mountain snow are expected periodically through the weekend, with the highest chance being in and west of the Cascades and the lowest chance in the Columbia Basin. Snow levels should remain high enough to not be an issue for cross-state travel. Lingering showers are possible Monday, but an upper level ridge building across the region is forecast to keep Eastern Washington dry through ..”

4/19/2021 Sunny and warm through Wednesday, becoming more active for the weekend

“The ridge of high pressure over the West Coast is expected to rebuild following an upper disturbance slipping into the Great Basin through Tuesday. In most of the state, this will result in sunny skies and seasonably warm temperatures. Thursday, northwest upper level flow becomes stronger with an increase in clouds (especially west of the Cascades) while a surface cold front clips the eastern half of the state. Friday into Saturday, the ridge pushes eastward to bring a closed low and southwest f..”

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Washington State University