Ridge & Approaching Front Bringing 65+ Degree Temperatures on Saturday

 FastCast—Thursday, Oct. 14 to Tuesday, Oct. 19:

Temperatures will slowly warm up as a short-lived ridge is over the area. Expect cloudy conditions with highs in the upper 50s to low 60s on Friday. Saturday gets even warmer, with highs reaching the mid to upper 60s, as an approaching cold front combines with the ridge to help increase temperatures. Rain moves in by Sunday, totaling up to 0.4 inches in the Seattle area, possibly higher in areas impacted by the Convergence Zone. With northwesterly flow aloft, the greater Seattle area will be in the “rain shadow,” meaning that the Olympic Mountains will block most significant rain from reaching the metro area. Expect conditions to dry out on Monday and Tuesday, with highs in the mid 50s to low 60s, before more rain arrives by the middle to end of next week.

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A short-lived ridge will be over Western Washington on Friday and Saturday. Its influence will be felt most in high temperatures. Expect highs reaching the upper 50s-low 60s on Friday, then highs in the mid-upper 60s on Saturday. It’ll likely feel uncharacteristically warm and somewhat muggy, even early in the day. Temperatures continue to increase, peaking around 3 PM Saturday, as seen in the UW forecast below.

Temperatures peak at 64+ degrees across the Lowlands, rare for mid-October. These warm temperatures will be aided by an approaching cold front, which will help increase temperatures a bit before it moves through by Sunday (when temperatures will be much cooler).

Below is the Weather Underground forecast for Federal Way.

As mentioned earlier, expect temperatures to increase through Saturday, then highs decrease over 10 degrees by Sunday as a cold front and associated rain impacts the area. We dry out on Monday and Tuesday, with highs in the mid 50s to low 60s, and lows in the 40s.

Let’s take a look at the UW rain forecast through 5 AM Sunday.

A rain-shadow effect is evident, with high rain amounts of 3-10+ inches across the North Coast and Southern Vancouver Island and 1-3 inches from Everett northward. In comparison, the metro area will likely receive 0.1-0.3 inches, except up to 0.75 inches due to Convergence Zone rain bands. The rain shadow can decrease rain totals by multiple inches over less than 100 miles!

Additionally, with warmer temperatures, snow levels will be higher, meaning not much mountain snow, except at high elevations.

If you want one more day of “warm” temperatures to enjoy outside, Saturday is your day!