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wind reports for the Gorge

 
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StillSailin



Joined: 02 May 2001
Posts: 40
Location: Portland/Vancouver

PostPosted: Thu May 29, 2008 1:10 pm    Post subject: wind reports for the Gorge Reply with quote

When I read the forecast (Iwindsurf), it talks about an upper level ridge in place or an upper level low. Forgive my stupidity, but what's that mean? Upper level low is in Thur daily discussion forcast
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derekmangan



Joined: 13 May 2006
Posts: 3

PostPosted: Thu May 29, 2008 2:39 pm    Post subject: Re: wind reports for the Gorge Reply with quote

mbrymer wrote:
When I read the forecast (Iwindsurf), it talks about an upper level ridge in place or an upper level low. Forgive my stupidity, but what's that mean? Upper level low is in Thur daily discussion forcast


High air pressure, commonly known as a "ridge," you can see this by looking at the anti cyclonic flow of air (rotates clockwise) on a weather chart (look at the isobars). A low, (low air pressure) has cyclonic air flow (rotates counter clockwise) is commonly refereed to as a trough. Cyclonic air flow generally means crummy weather unless there is a thermal low building (not the case right now) like the one on the coast we had a couple weeks ago creating that heat wave.
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StillSailin



Joined: 02 May 2001
Posts: 40
Location: Portland/Vancouver

PostPosted: Thu May 29, 2008 7:04 pm    Post subject: Reply with quote

You know your isobars. How can a low be in an upper level? Wouldn't surrounding higher pressure cause an upper level low to just drop, due to the differential?
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