Back to the Damp Side

Posted by Rufus La Lone on

Monday March 18
What a delightful weekend across the entire PNW.  We do have a day or two left before the current round of awesome wx fades into the past.  Let’s take a look.  Mug ready?
Today and Tue Mar 19 will be dry & mild, with temps topping out in the upper 60s to lower 70s west side.  Willamette Valley likely to get the 4th day in a row at or above 70 today, with a good chance for temps to be a couple degrees warmer than Sunday.  We do see a cool down beginning later on Wed, the first day of Spring.  Cool ’trough’ moving down the BC coast will slowly push onshore over the Puget Sound first, then NW OR by early Thu morning, Mar 21.  Mostly a cloud event, but a shower or two should not be ruled out.  Definitely cooler.  Friday is currently looking a tad warmer than Thu, as a southwest flow begins to enter the atmospheric theater.  This pattern will usher in a decent shot of RAIN late Fri through Sat, Mar 22,23.  Showers across the region on Sun Mar 24, although NW WA & Vancouver Is may escape much the precip.  
As the week of Mar 25-29 gets going, a cool, cloudy day or two early may lead to a few more dry days.  Models are mixed on this, but the trend is for the bulk of a large Low pressure trough to shift south offshore, with the main impact going to California.  That said, there will be some rain over OR, and maybe SW WA overnight Tue into Wed Mar 27, as said storm develops and tracks towards CA.  Drying west side, with wrap-around moisture from the CA storm keeping the eastern basins and ID damp as next week winds down.  The threat for a FROST on Good Friday or Sat morning is looking less likely, but it will be chilly overnight.
EASTER.  The last weekend of March is trending cool, with lots of clouds on Sat, turning WET later EASTER Sunday Mar 3.  Currently, there’s a reasonable chance for dry sunrise services in OR, with increasing chance for showers the farther north one travels north of OR early Easter morning.  Timing may change, but we do see rain across WA and NW OR at some point Easter Day.  BC, too.
April is charting to start on the chilly side, with plenty of rain and mountain snow.  Coats may be needed again, as there is model suggestion of a colder flow from the NW impacting the region early in April.  It has happened before.  We’ll keep you posted, of course.
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