angelswatch
Verified CFHC User
Reged: Fri
Posts: 17
Loc: FL
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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
Weather Analyst
Reged: Sat
Posts: 1024
Loc: Maryland
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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
Verified CFHC User
Reged: Fri
Posts: 17
Loc: FL
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Thank you thats what I thought they might be but was not sure.
1.Is this then what possibly makes the outer edges of appear ragged as they keep repeating on TV news?
2. Could it keep from going a certain direction?
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Random Chaos
Weather Analyst
Reged: Sat
Posts: 1024
Loc: Maryland
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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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