Effects of La Nina on Atlantic HC Conditions

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rjgator
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#1 Postby rjgator » Mon Apr 30, 2007 8:30 am

I was just curious if anyone can tell me why La Nina creates a more favorable enviornment for Hurricanes to form in the Atlantic
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Recurve
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#2 Postby Recurve » Mon Apr 30, 2007 8:00 pm

Basically, less wind shear in Atlantic TC formation areas is cited as a result of La Nina. Less wind shear = better environment for formation. Shear is a strong inhibiting force on tropical cyclone development. It tears them up, makes developing TCs weaken and run away rather than percolate and expand.

Put a cap on shear and all the other ingredients are there for more TCs to spin up.

My amateur explanation, xperts please correct any errors.
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#3 Postby milankovitch » Tue May 01, 2007 8:02 am

In an El Nino there is warmer water over the East Pacific and enhanced convection and therefore divergence aloft. This divergence aloft enhances shear in the Caribbean/Gulf and west tropical Atlantic mostly.
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