Saturday, August 29, 2015

Extraordinary August Storm

This is perhaps the strongest August storm on record---certainly the most impressive in my memory.

  Here are the maximum winds during the 24h ending 9 PM Saturday. 87 mph at Destruction Island on the central WA coast.  Lots of 60-70 mph gusts from Everett northward, with 40-50 mph being common over the rest of the region.


And here is a close-up view of the Puget Sound area.  Note...the zero winds should be ignored.


Nearly a half million folks lost power...perhaps the biggest wind-related August blackout in regional history. Why so many without power?  Strong winds, first storm of the season, and dry conditions (which appear to make trees more susceptible to limb loss).

Want to see something really amazing?  Here is the maximum hourly gust at Destruction Island.

It peaked at 78 knots. That is NINETY MILES PER HOUR.

And what about precipitation?   Here is the 24h amounts for the same period. OVER 4 inches over the SE side of the Olympics, with1-3 elsewhere over that range.  This will have a huge impact on the drought conditions there.  1-3 inches over the north Cascades,which will help knock back of the fires in that area.  Heavy amounts over SW Washington.


But it is NOT over yet. A large band of very heavy precipitation is now over western Washington (see radar).


And the forecast precipitation for the next 48h is considerable (several inches) over the Olympics and North Cascades (see map).


And plenty more rainfall after this period.

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