Bonnie is far from typical as highlighted in this excerpt from New Orleans NWS Morning Forecast Discussion.
The remnants generated a Tornado Warning around 430 AM local time for Plaquemine Parish. Just south of New Orleans... where some of the BP Encampment is located.
One hour rainfall estimates of 3 inches per hour or more in the proximity of the storm center.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
508 AM CDT SUN JUL 25 2010

.SHORT TERM...
THE REMNANTS OF BONNIE CONTINUE TO MOVE SLOWLY NORTH NORTHWEST
ACROSS THE SOUTHEAST LOUISIANA EARLY THIS MORNING. THE
CIRCULATION AROUND THE LOW IS EVIDENT ON THE 88D RETURNS...AND
HAVE RECENTLY BECOME VERY CONCERNED ABOUT ISOLATED ROTATING STORMS
AND SLOW MOVING DOWNPOURS NEAR THE REMNANT LOW CENTER SOUTH OF
LAKE PONTCHARTRAIN. THE AMOUNT OF CLOUD TO GROUND LIGHTNING AND
STRONG CELL ROTATION IS NOT YOUR TYPICAL TROPICAL VARIETY WITH 60
KNOTS OR SHEAR DETECTED EARLIER WITH THE STORM THAT PROMPTED THE
FIRST TORNADO WARNING NEAR LAFITTE LA.