Talking the Tropics With Mike

Posted: 7:24 a.m. Monday, July 14, 2014

Lots of Dry Air over Central Atlantic 

By Mike Buresh

A good deal of dry mid & upper level air is over the Central Atlantic as the Bermuda high remains anchored over the E/NE Atlantic.  The clockwise circulation around the high is helping produce swift winds from the east off the Saharan desert of Africa which in turn creates large clouds of sand & dry air that spread west across much of the Atlantic.  Sometime this Saharan sand can even reach the Caribbean islands & Florida.  The satellite imagery below from CIMSS (Cooperative Institute for Meteorological Satellite Studies) shows -- in the orange -- the very dry air currently in place (though not as dry & expansive as last week).  This dry air often inhibits the development of tropical cyclones.  Indeed... you can see tropical waves imbedded on the southern edge of dry air where better atmospheric moisture is located.  In fact, a sizeable wave is approaching the NE coast of S. America & SE Caribbean but forecast models are not enthused about this wave & with good reason.  Shear across the Caribbean seasonally strong -- 40-50 knots.

Also.... an upper low (cold core) is over the Central Atlantic south & southeast of Bermuda.  Tropical development appears to be unlikely..... at least in the short term.

Mike Buresh

About Mike Buresh

Action News Chief Meteorologist Mike Buresh is a self-professed "weather holic" and his fascination with weather developed at a very young age while growing up in rural Iowa.

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