Ed DunhamAdministrator
(Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017))
Thu Sep 16 2010 12:48 PM
Re: Karl Back Over Water, Igor Maintains Cat 4

From the NHC Glossary on the Fujiwhara Effect:
"The tendency of two nearby tropical cyclones to rotate cyclonically about each other."

Its a rare event in the Atlantic. If two storms get too close, the stronger storm will either shear apart the weaker storm or simply absorb it into a feeder band (Cindy/Emily - 1999) depending on the location of each storm to the other.

If Julia should get too close, the outflow from Igor will weaken it with strong northerly shear.
ED


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