FastCast—Saturday, May 7 to Wednesday, May 11:
An abnormal (much wetter than normal) pattern has brought a couple rainy days to Western Washington, with showers expected to continue at times from Friday night to Sunday night, with a break from midday Saturday until midday Sunday. Breezy conditions, with winds gusting 25-35 mph, are expected on Saturday. Convergence Zone activity is possible on Saturday afternoon around the Everett area. Rain totals through Sunday evening will be highly dependent on showers that move over your area. Generally, expect and additional 0.3-0.5 inches, with up to 0.75-1.25” under the Convergence Zone or heavier showers. Mountain snow is also expected, with up to 10 inches at higher passes, and up to 4 inches at Snoqualmie Pass. The snow level will hover around 3,000 feet this weekend. An interesting and noticeable weather impact this weekend will be the much below average temperatures that are expected. Highs through Monday will be in the mid 50s, nearly 10 degrees below average. Lows will also be below average, likely in the low 40s, 5-10 degrees below average. High temperatures will increase to the upper 50s on Tuesday and Wednesday, and drier weather is expected.
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This May has felt more like an extension of March, with temperatures in the 50s and showery conditions, including mountain snow. That trend will continue this weekend.
Below is the HRRR forecast for rain from Friday evening to Sunday evening.
Some of this has already fallen as of the writing of this blog. However, expect an additional 0.3-0.5 inches across Western Washington, with totals of 0.8 to 1.25 inches under the Convergence Zone (near Everett) or in stronger showers.
The rain should mostly end by midday Saturday, with a slight chance of showers late Sunday and late Monday…but much less rain than the past few days.
Expect breezy conditions on Saturday, mainly south of Seattle and along the Strait of Juan de Fuca. Gusts will be 25-35 mph, except up to 40 mph along the Strait.
In a rare twist for May, it will snow at the Passes this weekend. The snow level will be all the way down to 3,000 feet. The HRRR forecast below shows snow through Sunday evening.
This is quite a snow map for May! Expect 1-4 inches of snow at Snoqualmie Pass and up to 10 inches at the higher passes. The snow level will hover around 3,000 feet, very low for May. Snow will even fall in the Coast Range of Oregon and the Blue Mountains of SE WA and NE OR. Higher elevations in the Cascades will receive upwards of 1-2 feet of snow (3+ feet at the mountain peaks)!
This will be quite the contrast for the Blue Mountains, which had severe thunderstorms Friday evening!
In addition to showers and mountain snow, temperatures of 10-30 degrees below average will continue across the entire Pacific Northwest, as seen in the European model forecast for 5 PM Saturday.
Western Washington is not alone in the not-May-like temperatures. The entirety of Washington, Oregon, Idaho, and Western Montana are all experiencing temperatures 5-15 degrees below average. One of the most stunning parts of this map is the below average temperatures in the Cascades. Temperatures this weekend will be up to 20-30 degrees below average, explaining some of the weekend snow.
There is good news…as some forecasts show warmer temperatures returning by mid-May!
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