But as a weak trough slid over the region overnight, it managed to trigger a thunderstorm in the dead of night.
As in one. A very lonely thunderstorm.
Updated Tuesday 4:30 p.m.
Marine layer, take 2:
The marine layer was quite the dud last night, allowing a sunnier day than expected with temperatures warming near 80. But the marine push is set to make up for lost time with a much stronger event tonight.
But we have a few wrinkles to deal with first. The air mass is a little unstable and short-term forecast models indicate some showers are likely to build off the Olympic Mountains and drift east across Kitsap County.
There is also evidence of a budding Puget Sound Convergence Zone as winds coming down the Strait of Juan de Fuca mesh with southerly winds coming up from Puget Sound area. Clouds have been increasing in the Seattle area and a few light rain showers can't be ruled out here this evening and early night as well. Scattered showers are also possible in the Cascades.
The chances of the showers aren't high but enough to mention so while it's been a dry and sunny day, there is a risk of a surprise shower or two tonight, especially in those aforementioned areas.
Aside from the isolated showers, tonight will be marked by a rather strong marine push. Low clouds will roll in both down the Strait of Juan de Fuca and through the Chehalis Gap amid gusty winds to 25-30 mph and fill in the Puget Sound area overnight with lows in the mid-upper 50s.
Wednesday will be cloudy at the start and likely stay cloudy through much of the day --maybe some sunbreaks late -- with highs in the upper 60s to low 70s. I know we thought the marine layer would be stronger today but the wind gradients are much stronger this evening, giving much better confidence to the marine push forecast.
Marine winds will then spend the rest of the week gradually weakening and that means each day the sun will come out at little earlier from our morning overcasts. Expect highs on Thursday to reach the mid 70s and then upper 70s on Friday.
The weekend is shaping up to be another pleasant one with plenty of sunshine both days and highs around 80.
Long range models diverge a bit after the weekend with some trending warmer and others cooler so we're going to stick upper 70s on there as a placeholder until we get a more consistent feel for highs, but it still looks to remain dry either way.
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