99L has been upgraded to a "Special Feature" in the latest TWD:

...SPECIAL FEATURE...

CENTRAL CARIBBEAN TROPICAL WAVE IS ALONG 75W/76W S OF CUBA WITH
A 1010 MB LOW ALONG THE WAVE NEAR 14N. OBSERVATIONS FROM BUOY
42058 SUGGEST THERE IS A WEAK LOW ASSOCIATED WITH THE WAVE WITH
WLY WINDS RECENTLY REPORTED...THOUGH THOSE WINDS ARE LIKELY
ENHANCED BY DOWNDRAFTS AND OUTFLOW BOUNDARIES. VISIBLE
SATELLITE PICTURES SHOW BANDING FEATURES DEVELOPING ON THE N
SIDE OF THE WAVE WITH SYMMETRIC OUTFLOW. THIS AREA HAS THE
POTENTIAL TO BECOME A TROPICAL CYCLONE WITHIN THE NEXT 36
HOURS. A SLOW MOVEMENT TO THE WNW IS LIKELY... PLACING THE
SYSTEM IN THE W CARIBBEAN LATE WED/EARLY THU. SCATTERED
MODERATE CONVECTION IS FROM 13.5N-17.5N BETWEEN 74W-78W. HEAVY
RAIN IS POSSIBLE FOR JAMAICA LATER TODAY AND OVERNIGHT.

They also have two recon flights scheduled for tomorrow on the latest recon POD.