From the National Weather Service:
A FLOOD WATCH HAS BEEN ISSUED FOR THE ENTIRE OUTLOOK AREA TONIGHT. THE PRIMARY THREAT AREA IS GENERALLY WEST OF THE I-55 CORRIDOR FROM SUMMIT MISSISSIPPI TO LAPLACE TO THIBODAUX LOUISIANA. REDEVELOPMENT OF THUNDERSTORMS OVERNIGHT MAY RESULT IN ACCUMULATIONS OF 1 TO 2 INCHES WITH LOCALLY HIGHER AMOUNTS TO 4 INCHES POSSIBLE.

Rainfall totals from today:

Poydras: 2.75"
Audubon Park: 1.75
Belle Chasse: .87
Lakefront: .21
NO Airport: .83
River Ridge 1.40
WWL-TV: 1.16
Covington: 1.43
Folsom: 1.15
McComb: .72