2/5/12 Something "tropical"???

An interesting feature has shown up on the weather map this weekend.

A inverted surface trough (which would resemble a tropical wave in the summer months) has moved across the Caribbean sea over the weekend. 

Today, showers and thunderstorms are becoming a bit more clustered around a broad area of low pressure off the Yucatan.

From the National Hurricane Center at 1 PM Sunday 2/5  

A SURFACE TROUGH THAT EXTENDS 
FROM THE GULF OF MEXICO THROUGH THE YUCATAN CHANNEL INTO THE W 
CARIBBEAN NEAR 21N86W TO THE GULF OF HONDURAS NEAR 16N88W 
GENERATING CLUSTERS OF SCATTERED TO HEAVY SHOWERS WITH SCATTERED 
THUNDERSTORMS N OF 16N E OF THE SURFACE TROUGH AND W OF A LINE 
FROM CUBA NEAR 22N78W TO HONDURAS NEAR 15N84W. THIS AREA IS 
BEING CLOSELY MONITORED FOR POSSIBLE FURTHER DEVELOPMENT.

1 PM Satellite of the "disturbance" in the Yucatan channel

Surface Pressure and 500-1000 thickness and 925 mb wind speeds

Phase diagram showing that the cyclone is warm core in nature or at least will be borderline (warm core = tropical cyclone)  Link