An afternoon thunderstorm cluster popped-up around Grand Isle, producing at least a couple waterspouts, with one making landfall and becoming a tornado. Here is the summary from the NWS:
0240 PM TORNADO GRAND ISLE CMAN 29.27N 89.96W
05/09/2012 JEFFERSON LA TRAINED SPOTTER
NWS COOPERATIVE OBSERVER AND ISLAND RESIDENT SURVEYED THE
DAMAGE AND DETERMINED A TORNADO DAMAGE PATH OF 1/4 MILE
LONG…400 FEET WIDE. WATERSPOUT MOVED ASHORE NEAR THE
END OF ROSETHORN LANE…MOVED SOUTH ACROSS
MULBERRY…CRANBERRY AND ELDERBERRY LANES. ONE HOME HAD
ROOF COMPLETELY REMOVED. SEVEN OTHERS HAD VARIOUS DEGREES
OF ROOF DAMAGE. NUMEROUS SHEDS…CARPORTS AND STRUCTURES
DAMAGED. THREE POWER LINES WERE DOWNED ALONG HIGHWAY 1.
TORNADO LIFTED A FEW HUNDRED YARDS SOUTH OF GRAND ISLE.
Below is a look at the radar at 2:40 PM, the time at which the waterspouts were occurring. After moving across Grand Isle, the cluster moved into the Gulf and weakened.