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What makes it blow at Sherman?
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afolander



Joined: 22 Jul 2002
Posts: 74

PostPosted: Wed Jun 20, 2007 11:37 am    Post subject: Sherman wind Reply with quote

You can also get good info on noaa.gov. For example,

http://www.wrh.noaa.gov/mesowest/mwmap.php?map=mtr&limit=1

shows current temperatures, wind, and pressure readings at sites not on Iwindsurf.

If the wind is clocking N or NE on the ridge tops (e.g. Mt Diablo / Briones) then the wind at Sherman usually tops out in high teens at best (except for winter N wind days). On the other hand, if the ocean buoys are showing wind from the South (preceded by S to N pressure gradients) then fog usually creeps up the coast and produces good marine surge thermal wind in the summer at Sherman.

The NOAA forecast discussion updates and their satellite animations of fog formations also help me figure out what gear to bring to Sherman.
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beallmd



Joined: 10 May 1998
Posts: 1069

PostPosted: Wed Jun 20, 2007 1:40 pm    Post subject: Reply with quote

OTOH, from a scientific point of view there is no good explanation for the morning wind in the Delta. Godsey and others have givin it a shot but it is just a local phenomenon that is true. The evening wind makes sense. Another observation here; Wind Is the least accurate part of any forecast,and always has been.
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thirsty



Joined: 10 Apr 2000
Posts: 6

PostPosted: Thu Jun 21, 2007 12:11 am    Post subject: Reply with quote

So what are the explanations for morning wind (and the midday lull) at Sherman Island? I sent an email to the NWS regarding this a few weeks ago but haven't heard anything. The SF/Monterey NWS web site claims that no question is too hard for them, but maybe this one is.
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RyszardJH



Joined: 21 Feb 2001
Posts: 1

PostPosted: Thu Jun 21, 2007 7:52 am    Post subject: Reply with quote

Also keep an eye on the Travis AFB sensor. It is a good predictor for Sherman wind for that day. If it reads higher than Sherman it will keep blowing at the Delta. If it reads low the wind my drop at Sherman quickly
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afolander



Joined: 22 Jul 2002
Posts: 74

PostPosted: Thu Jun 21, 2007 9:08 am    Post subject: Reply with quote

There is often a streamer of marine air (from N tower of the GG bridge past TI and Blunt Point on Angel Island) that surges overnight towards Sherman. As the sun rises the marine air burns off and the wind backs down as the local thermal disappears. Its not unusual for the San Joaquin river under the Antioch bridge to look like a lake at daybreak while the wind howls up the Sacramento river just NE of the bridge.

The sensors upwind of Sherman can be good leading indicators for the typical early morning and afternoon /evening surge of wind.
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