SW at Coyote

From: B D (windtalkposter@hotmail.com-DeleteThis.com)
Date: Tue Jun 04 2002 - 10:27:54 PDT 

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From: "B D" <windtalkposter@hotmail.com-DeleteThis.com>
To: wind_talk@opus.labs.agilent.com-DeleteThis.com
Subject: SW at Coyote
Date: Tue, 04 Jun 2002 10:27:54 -0700
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Thought you might be interested in Mike Godsey's reply to
my question, "why so much SW in the last few years?:

"The short answer is that we are seeing more troughs.

Here is a link (valid only for today) that shows and
incoming trough that may cause problems Saturday.

http://weather.unisys.com/aviation/4d/avn_pres_4d.html

This model forecast is for Saturday at 18000 feet. See
the dashed yellow lines in the upper left corner? See
the downward looping pattern of the lines? That is a
body of low pressure air at about 18,000 feet. The
wind goes from west to east parallel to those lines.
That means that the part of the trough that is nearing
the west coast will have SW wind. If the North Pacific
High is weak then the SW flow will deepen the marine
layer and may cause problems for Coyote.

The bigger quesition: Why more troughs? Looking over
decades the Peninsula often had foggy summers and SW
flow 15 t 20 years ago. When I first started
windsurfing Larkspur which loves SW flow used to blow
3-5 days a week and San Francisco and the Peninsula
spent most summer days struggling with fog. Going to
Sherman Island or San Luis often in the summer was part
of being a Peninsula sailor. Then for about 10 years
we had fewer troughs and the the North Bay had crummy
wind. Now we may be swinging into another pattern.
There seems to be poorly understood climatological
cycle going on."

Mike

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