I believe this forecast is related to the spurious GFS system that is forecast for later this week in the NW Caribbean..
TROPICAL DISCUSSION - INTERNATIONAL DESKS NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD 234 PM EDT MON MAY 14 2012
NOTE: THERE IS A RISK OF HEAVY RAINS TO AFFECT EASTERN YUCATAN/BELIZE/EASTERN GUATEMALA AND NORTHERN-EASTERN HONDURAS DEVELOPING ON WEDNESDAY AND PEAKING INTO THURSDAY/FRIDAY. THIS IS A POTENTIALLY DANGEROUS SITUATION WITH THE RISK OF FLASH FLOODS AND MUD SLIDES.