Just a heads up to the Caribbean Discussion from this afternoon. The GFS is forecasting a cyclone to develop in the area of 25N 55W over the next few days.

Now it gets really weird. This is forecast to be a hybrid-hybrid. Warm Core system in the low levels and Cold Core system in the upper levels. ( Sounds like a Hail producer to me ).

Here's the excerpt from the Discussion and a link to follow the next few day's Discussions.

TROPICAL DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
212 PM EST WED JAN 09 2008

...OVER THE CENTRAL ATLANTIC...AT MID LEVELS...A LOW NEAR 25N 55W
SUPPORTS A TROUGH WITH BASE EXTENDING INTO THE EASTERN
CARIBBEAN/NORTHERN SOUTH AMERICA. THE TROUGH WILL REMAIN NEARLY
UNCHANGED THROUGH 36-48 HRS. BUT BY 60-84 HRS IT WILL START TO
WEAKEN AS THE SUBTROPICAL RIDGE TO THE WEST FLATTENS. AT LOW
LEVELS THIS TROUGH INDUCED AN INVERTED TROUGH ALONG 55N...WITH A
CLOSED LOW TO FORM ALONG THIS AXIS. THE GFS ONCE AGAIN FAVORS A
WARM CORE LOW LEVEL CYCLONE...WHILE AT UPPER LEVELS IT RETAINS ITS
COLD CORE CHARACTERISTICS. UNDER THE INFLUENCE OF THE MID LEVEL
TROUGH MESO VORTICES ARE FORMING NORTH OF THE ISLANDS AND
SPREADING ACROSS HISPANIOLA TO THE CARIBBEAN. VISIBLE IMAGERY
SHOWS ONE OF THESE VORTICES NORTH OF THE DOMINICAN
REPUBLIC...WHILE ANOTHER MEANDERS SOUTH OF THE ISLAND. MODEL
ANALYSIS SHOW THESE PERTURBATIONS AT 700 HPA...ARE THEY ARE TO
EMBED ALONG A NARROW TROUGH THAT MEANDERS OVER THE EASTERN
CARIBBEAN ALONG 13N-14N BY MID CYCLE. EARLY IN THE
PERIOD...HOWEVER...SOME CONVECTIVE ENHANCEMENT IS POSSIBLE OVER
THE DOMINICAN REPUBLIC...WITH RAINFALL AMOUNTS OF 05-10MM/DAY AND
MAXIMA OF 15-25M. BUT...AFTER 30-36 HRS THE FOCUS OF CONVECTION
MOST LIKELY WILL SHIFT SOUTH TO THE OPEN WATERS OF THE EASTERN
CARIBBEAN. OVER THE EASTERN CARIBBEAN ISLES...UNDER THE INFLUENCE
OF THE UPPER TROUGH...A SLIGHT INCREASE IN ACTIVITY IS EXPECTED
OVER THE SOUTHERN FRENCH AND WINDWARD ISLES BETWEEN 36-84
HRS...WITH RAINFALL AMOUNTS OF 00-05MM/DAY AND MAXIMA OF 10-15MM.

http://www.hpc.ncep.noaa.gov/discussions/fxca20.html