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Thursday, July 27, 2017

Drizzle Storm Hits Seattle: One Record Lost

A deepening marine layer this morning resulted in a period of very light drizzle, producing a trace (less than .01 inches) of precipitation at Seattle-Tacoma Airport.

As a result, we have lost the chance for a big record:  the first July or any month without any precipitation at Seattle-Tacoma Airport, a location with data back to 1948.

The visible satellite imagery this morning at 9 AM shows marine clouds over western WA.


And the Seattle Space Needle Panocam shows a very moist, drippy lower atmosphere.

The hourly observations shows the precipitation event (L- indicates very light rain and T means trace). Drizzle started at 6:42 AM and ended 7:29 AM).


Since we had only a trace of rain, we still might beat the big record--the record number of days in a row without measurable rain  (51 days).  

Today, we are at day 40.  The latest European Center model ensemble forecast prediction for 24-h precipitation suggests we are on the edge for beating the record, particularly with a potential light event on August 31st when the ensemble mean reaches .012 inches.


Keep your fingers crossed.



from Cliff Mass Weather and Climate Blog http://ift.tt/2v3pXGb

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