Sunday, October 10, 2021

Week to Begin Dry, Then Next Rainy Pattern Begins

 FastCast—Monday, Oct. 10 to Saturday, Oct. 16:

After rain, breezy conditions, and scattered thunderstorms over the weekend, a couple dry days are ahead. Showers in the South Sound will move out by late Sunday night, with conditions drying out on Monday. Lows Monday night/Tuesday morning will drop into the low-mid 30s across the area. Light showers move in by Tuesday evening, totaling up to 0.2” by Wednesday. More rain moves through from Thursday to Saturday, up to 1 inch. Generally, expect highs of 53-57° and lows of 40-47°, except colder Tuesday morning.

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Continue reading the full blog below!

South of Seattle, Sunday was an active day! A Puget Sound Convergence Zone moved south, bringing thunderstorms with it. Multiple lightning strikes were detected, most over Vashon Island, Des Moines, and Federal Way. 24-hour rain totals (ending 8 PM Sunday) are below.


You can tell where the heaviest cells were by the higher totals, particularly amounts of 0.5 to 1 inch between Vashon Island and Black Diamond, then 1.5-1.8 inches south of Snoqualmie Pass.

Looking ahead (Federal Way Weather Underground forecast below), a couple colder nights are expected.


Notice a cold morning on Tuesday, with lows in the low to mid 30s, coldest in outlying areas. Light showers move through late Tuesday to early Wednesday, then more rain moves in late in the week.

Looking at the extended UW rain forecast, substantial amounts are possible over the next 7 days.


The extended forecast shows 1-3 inches of rain in Western Washington, up to 7.5 inches in the mountains, and 0.1-0.75 inches in Eastern Washington, potentially more in isolated locations.

Stay tuned!

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