FastCast—Thursday, Aug. 4 to Monday, Aug. 8:
Wednesday was a pleasant—and average—summer day for the Seattle area. It began overcast and ended up mostly sunny with highs in the mid 70s and a refreshing marine breeze. Clouds are increasing and showers will move through Western Washington late Wednesday night through Thursday morning. Thursday will be the coolest and cloudiest day in the near future. Highs will only reach the mid 60s to low 70s, coolest by the water. Total rain from a weak band of showers will be 0.05-0.15 inches in the Seattle area and up to 0.2-0.5 inches from Mount Vernon northward and in the Cascades. The coast will pick up 0.1-0.2 inches. A big change arrives on Friday. Flow will shift from onshore to northerly, clearing out clouds. Friday’s highs will reach the mid to upper 70s around the lowlands. Saturday will be even warmer, with highs in the low to mid 80s. Sunday and Monday will be the hottest days of the upcoming mini heat wave, with highs likely in the upper 80s to low 90s around the area, with areas in the foothills, valleys, and Olympia area likely hitting the mid 90s. Low temperatures will be in the low 50s by Thursday morning and will slowly rise, reaching the upper 50s to low 60s by Sunday and Monday mornings. Stay tuned for updates on the upcoming hot stretch.
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Continue reading the full blog below!
A chance of rain is in the forecast! A weak front will move from NW to SE across Western Washington overnight Wednesday into Thursday morning, and it will bring a chance of showers to the area. The HRRR rain forecast is below.
This is the first rain forecast in weeks on this blog! Expect 0.05-0.15 inches of rain in the metro area. North of Mount Vernon and in the Cascades, totals will reach 0.2-0.5 inches!
Since this is a weak system, rain will fizzle before reaching Eastern Washington, although there will be cooler temperatures as a result of this weak system. The NAM forecast for Thursday’s highs is below.
It will be a cool day, with highs in the mid 60s to low 70s in the lowlands. Eastern Washington will experience their coolest temperatures in quite a while, with highs reaching the upper 70s to upper 80s.
Friday morning lows will be very refreshing after all the heat we have experienced lately. The NAM forecast is below.
Wow! Expect lows dropping to the low 50s for the lowlands, with some outlying locations dipping into the upper 40s on Friday morning! Even Eastern Washington will drop into the mid 50s to low 60s.
However, the cooler temperatures and cloudy weather will not last long. Sun returns on Friday and a gradual warmup begins. A ridge of high pressure will be rebuilding offshore and moving over the Pacific Northwest. By Sunday, temperatures will be soaring back into the low 90s for parts of Western Washington. The GFS (American model) forecast is below.
While this forecast model tends to be 2-3 degrees too hot, Western Washington will still experience 2-3 days in the mid 80s to low 90s, with more upper 90s to low 100s coming for Eastern Washington and the Portland area. The good news is that this mini heat wave will be short-lived, with temperatures returning to the low 80s by next Tuesday.
Stay tuned for more information in upcoming blogs!
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