Updated Tuesday 2:45 p.m.
Another round of scattered showers and isolated thunderstorms are on tap for this evening and tonight, with the few thunderstorms mostly relegated to the mountains, foothills and south of Seattle where the air mass is more unstable, and those should fizzle after dark. Lows will be in the low-mid 50s.
Clouds and showers will be a bit more prevalent on Wednesday as our big sprawling area of low pressure slowly slides into Oregon, pelting us with those showers as it does so -- and once again a few isolated thunderstorms are possible as well. Highs will drop a bit to the mid 60s.
It's Thursday that will make you wonder if you somehow, overnight, a time machine appeared, sucked you into its vortex, and put you back to November 19th. (Or, you'll just wake up and go, "Hmph, another Seattle June day"). Forecast models continue to show an impressive plume of moisture that will wrap around the low and push in moderate to heavy rain from the east/northeast on Thursday. The models have backed off a little on the expected rainfall totals -- now more 1.00-2.50" north and mountains and 0.50-1.25" in the lowlands, but still quite impressive rainfall totals for June.
So expect a cool, rainy, blustery day that will probably make you wonder if it really is supposed to be the longest day of the year. Temperatures will probably spend much of the day in the 50s, maybe eke into the low 60s at the buzzer.
Showers linger into Friday morning but will taper off as the day progresses with sunbreaks late in the day. Highs should reach the mid 60s.
Saturday is still far and away the nicest day of the period but perhaps not quite as sunny as initially thought. Models show a weak system quickly trying to sneak in here but falling apart offshore -- yet still enough that there might be some remnant clouds. So we'll go partly sunny but probably not quite as sunny as the past two days have been. With warmer southerly flow, at least temperatures should be boosted back into the mid 70s.
Our next storm is better organized and will bring another round of steady rains. It looks like clouds will be here by Sunday morning with rain developing late in the afternoon or early evening. Highs will drop just a little to near 70.
Long range models show yet a third system for early next week so showers remain in the forecast for Monday and Tuesday with highs in the 60s. Beyond that, still a general cool and showery pattern. Sun fans: How many days until July 5? :)
Scott Sistek
KOMONews.com Meteorologist
Follow me on Twitter @ScottSKOMO and on Facebook.
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