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StillSailin
Joined: 02 May 2001
Posts: 64
Location: Portland/Vancouver
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 Posted: Thu May 29, 2008 1:10 pm Post subject: wind reports for the Gorge |
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| 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: 06 Oct 2015
Posts: 3
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| Posted: Thu May 29, 2008 2:39 pm Post subject: Re: wind reports for the Gorge |
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| 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: 64
Location: Portland/Vancouver
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| Posted: Thu May 29, 2008 7:04 pm Post subject: |
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| 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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