FastCast—Saturday, Aug. 27 to Wednesday, Aug. 31:
Friday was substantially cooler than Thursday, with highs nearly 20 degrees below the previous day. The cool conditions will continue on Saturday, with highs in the low 70s around the region. A weak system moving through on Saturday will bring a chance of showers overnight and into the morning. The highest chance of rain is in the Puget Sound Convergence Zone, between Arlington and Seattle, where 0.1-0.25 inches of rain is possible. The Central Olympics and West Slopes of the Cascades may receive up to 0.75 inches of rain in isolated areas. Other parts of the lowlands will receive up to 0.1 inches of rain. Clouds will diminish on Sunday and Monday, with highs in the upper 70s to low 80s. Heat builds once again on Tuesday and Wednesday, with highs in the lowlands reaching the upper 80s, cooler near the water and warmer in the foothills. Eastern Washington will once again reach the upper 90s to mid 100s. The coast will be much cooler, in the 60s.
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For the first time in weeks, there is a decent chance of rain in parts of Western Washington. The HRRR forecast for rain through 11 PM Saturday is below.
The HRRR forecast has consistently been on the lighter side for this rain, showing amounts of 0.01-0.05 inches, most in the mountains downwind of Convergence Zone bands (up to 0.2 inches).
The NAM forecast has been showing much more rain through 11 PM Sunday, as seen below.
The NAM forecast shows 0.1-0.5 inches of rain on the coast and 0.25-0.75 inches (potentially more) in parts of the mountains. In this forecast, the Convergence Zone area between Seattle and Arlington receives 0.1-0.3 inches of rain, with other parts of the lowlands receiving up to 0.1-0.2 inches.
However, this chance of rain and cool weather won’t last long. Temperatures rebound back to the upper 70s and low 80s with decreasing clouds on Sunday and Monday. Then, the next round of heat builds. Similar highs are expected on Tuesday and Wednesday (seen below from the European model).
Expect another couple days of lowland highs in the upper 80s, except cooler near the water. The Portland area and SW WA will reach the upper 80s to low 90s, and the coast will remain cool, in the 60s. It will be very hot again in Eastern Washington, with highs reaching the upper 90s to mid 100s.
Enjoy a change in the weather and stay tuned for more information on the upcoming heat!
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