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General Discussion >> Hurricane Ask/Tell
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angelswatch
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Explanation of Orca Map
      #50670 - Sat Aug 27 2005 10:17 AM

Can someone explain the darker blue areas in this map and if they have any effect on holding back or stopping a hurricane from moving in a particular direction?

http://orca.rsmas.miami.edu/wximages/jet/1_05/anis.html

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Random Chaos
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Re: Explanation of Orca Map [Re: angelswatch]
      #50674 - Sat Aug 27 2005 10:21 AM

The darker blue areas are extremely dry airmass areas.

Why do these effect hurricanes?

1. Hurricanes, ingesting dry air, weaken rapidly.
2. Dry air usually accompanies high pressure areas, which in turn cause shear conducive to the weakening of the hurricane, and also "push" the hurricane away from them.

Does this help? I'm not a met so I'm sure others can give you a better answer

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angelswatch
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Re: Explanation of Orca Map [Re: Random Chaos]
      #50678 - Sat Aug 27 2005 10:27 AM

Thank you thats what I thought they might be but was not sure.
1.Is this then what possibly makes the outer edges of Katrina appear ragged as they keep repeating on TV news?
2. Could it keep Katrina from going a certain direction?

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Random Chaos
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Re: Explanation of Orca Map [Re: angelswatch]
      #50691 - Sat Aug 27 2005 10:50 AM

Katrina is in fairly moist air. On your graphic look out in the Atlantic. There are a couple bubbles of very strong dry air out there.

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