Clouds, drizzle make way for more thunderstorms and sun | Weather

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Clouds, drizzle make way for more thunderstorms and sun
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Clouds, drizzle make way for more thunderstorms and sun

Out with one low...in with another.

The thunderstorm threat temporarily took off as one area of upper-level low pressure moved off to the east overnight, but that threat will increase once again -- especially Monday -- as a new upper low slides south from British Columbia.

Due to its' counter-clockwise circulation, this new upper low has helped increase the onshore flow.  That has led to widespread cloud cover this morning, with many areas of drizzle being reported.  The marine layer is thicker today, so there will be little if any sunshine this afternoon.  Daytime high temperatures will stay in the mid-60s, 10 degrees cooler than normal.  There is a very small late-day thunderstorm threat, mainly north of Everett closer to the low.

The winds will "flip" to a different direction as this low pressure area sags to our south on Monday.  Plan on a good dose of afternoon sunshine (and highs back in the 70s), but any thunderstorms that form over the Cascades will be pushed back toward the I-5 corridor.  This is a similar pattern to last Friday, when we endured a few rounds of scattered thunderstorms.  Please remember to bring the kids inside immediately if you hear thunder.

Tuesday and Wednesday will feature a lesser chance of a shower or thunderstorm mixed in with partly sunny skies.  Highs will reach the mid-70s.

Most long-range computer forecast models stabilize the atmosphere by the end of next week, and we likely will go back to a "morning clouds, afternoon sunshine" pattern as we approach the weekend.

Make it a great day!

Paul Deanno, KOMO4 Meteorologist
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