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Revised in 11 passages since the 9:32 AM discussion. See every revision.
An upper level trough will continue to move east of Western Washington today. Drier and warmer weather Monday and Tuesday as an upper level ridge builds over the Pacific Northwest. An upper level low will approach the area around midweek, bringing increasing onshore flow and cooler temperatures to Western Washington for the second half of the week.
An upper level trough continues to push across Washington this afternoon. Partly cloudy skies this afternoon with high temperatures in the low to mid 70s across the interior and mid 60s along the coast. An upper level ridge will build over the Pacific Northwest on Monday, with the ridge axis east of the Cascades on Tuesday. This will bring warmer and drier conditions. The warmest day will be Tuesday. High temperatures are expected to peak in the mid 60s/low 70s along the coast. Across the interior, temperatures will climb into the 80s and low 90s in the Cascade valleys. This will reintroduce widespread areas of Moderate HeatRisk for the Everret-Seattle-Tacoma Metro and Cascade valleys.
Additionally, surface flow will transition more northerly to easterly Monday and Tuesday, resulting in wildfire smoke being transported from nearby fires in British Columbia and Eastern Washington into Western Washington. 29
There is good agreement between ensemble guidance that an upper level low will approach the Pacific Northwest on Wednesday and an upper level trough will settle over the region through late in the week. This pattern will reinstate onshore flow across Western Washington and bring cooler temperatures. Latest guidance has high temperatures trending slightly below normal in the the low to mid 60 along the coast and low to mid 70s across the interior. Low temperatures by the end of the week will trend towards the low to mid 50s. Chances for precipitation look to return on Wednesday and continue into the weekend. However, the latest expected rainfall amounts indicate precipitation will be light. While thunderstorm chances remain at 10% or less, they could be a possibility on Wednesday and Thursday as the upper level low swings north into British Columbia and brings southwesterly flow aloft over Western Washington. 29
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