Next System Brings Rain Through Thursday, Then Weather Improves

 FastCast—Tuesday, Sept. 28 to Monday, Oct. 4:

After over an inch of rain for most of the region from Sunday to Tuesday, we’ll have a bit of a break through Wednesday afternoon. Showers increase by Wednesday evening, and rain will fall until late Thursday afternoon, with up to 0.75” of rain possible south of Everett. Partly to mostly cloudy and dry conditions begin on Friday. Daily highs increase from the low 60s on Thursday to the upper 60s/low 70s on Sunday and Monday. Expect lows in the mid 40s to low 50s.

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Our next weather system is ahead, after a short break. Rain will arrive by Wednesday evening, and continue through Thursday afternoon, punctuated by a frontal passage midday Thursday.

Below is the UW forecast for rain from Wednesday to early Friday.

Expect 0.5-0.75 inches around the metro area, with more in the foothills (up to 1.25”), and significantly more (1.25-2”) north of Everett, and 1.25-7.5+ inches in the mountains and on the coast.

Thursday’s rain will be heaviest during a frontal passage around midday Thursday. The predicted radar image for 11 AM Thursday (from the UW model) is shown below.

This will be similar to other recent frontal passages for our area. Expect brief heavy rain, a temporary increase in winds, and a sharp decrease in temperatures.

As mentioned in the FastCast, weather improves starting Friday. The Federal Way forecast from Weather Underground is below.

Conditions get drier and gradually warmer through the weekend, with highs reaching the upper 60s by Sunday (and low 70s on Monday). Lows in the mid-upper 40s are expected, coolest on Friday night.

All our recent rain will help Western Washington to end September at least 0.5” above normal, a welcome change from a dry summer. Welcome to fall weather!