New Orleans International Airport (ICAO code: MSY) received a daily record 4.1 inches of rain Monday, with downpours in other parts of the region. The old record was 2.43 inches in 1995. The pattern probably won’t dry up until late week.
A frontal boundary will stall across the South over the next few days. Waves of energy will travel along the front and, with plenty of moisture in the air, will produce periods of showers and thunderstorms. The rain may be torrential at times, resulting in low visibility for drivers, as well as the potential for flash flooding and road closures.
The National Weather Service (NWS) has issued flash flood watches from just east of Dallas into Louisiana, Mississippi and Alabama. These are the areas most prone to flooding based on forecast precipitation totals and their low elevations.
Total rainfall through early Friday morning could exceed 5 inches in some places. The heaviest rain will probably hit areas along and south of Interstate 20, including the eastern suburbs of Dallas; Shreveport, Monroe, Baton Rouge and New Orleans, Louisiana; Hattiesburg, Gulfport and Biloxi, Mississippi; in addition to Mobile, Alabama.
The watches are set to expire either Wednesday morning or afternoon, depending on location. However, expiration times may change, and the NWS may add other areas to the watches.
By Thursday, most of the heavy rain threat should be confined to spots from southeastern Louisiana to southern Georgia and portions of Florida. Most of the South should get a chance to dry out Friday and Saturday.
Impact on freight
This will not turn into a large-scale aerial flooding event across the South. It will mainly be a nuisance for drivers moving through the region, but major impacts on freight flows and supply chains are unlikely.