I'm just checking in and I'm not sure if this weather is the outer fringes of 91L or part of the MCV. Mesoscale Convective Vortice/ Vortex.
This Airport is reporting the highest sustained wind among all of the Airports in the Lesser Antilles.

Current Weather Conditions:
Hewanorra International Airport, Saint Lucia
(TLPL) 13-45N 060-57W 10M
Conditions at
2011.08.01 1500 UTC
Wind from the ENE (070 degrees) at 21 MPH (18 KT)
Visibility greater than 7 mile(s)
Sky conditions mostly cloudy
Weather Cumulonimbus clouds observed
Temperature 84 F (29 C)
Dew Point 78 F (26 C)
Relative Humidity 83%
Pressure (altimeter) 29.85 in. Hg (1011 hPa)

Other Caribbean Airport Observations may be viewed here.

ANOTHER HURRICANE
HUNTER AIRCRAFT IS SCHEDULED TO INVESTIGATE THE DISTURBANCE THIS
AFTERNOON. IF THE SYSTEM BECOMES A TROPICAL CYCLONE TODAY...
TROPICAL STORM WARNINGS WOULD BE ISSUED FOR PORTIONS OF THE
NORTHERN WINDWARD ISLANDS AND THE LEEWARD ISLANDS ON VERY SHORT
NOTICE. INTERESTS IN THESE AREAS SHOULD CLOSELY MONITOR THE
PROGRESS OF THIS SYSTEM. REGARDLESS OF TROPICAL CYCLONE DEVELOPMENT
OF THIS SYSTEM WILL BRING LOCALLY HEAVY RAINFALL AND GUSTY WINDS TO
PORTIONS OF THE LESSER ANTILLES TODAY AND TONIGHT.