I'll start with what's going on in Louisiana right now:
Flash Flood Emergency in Northern Lousiana: Over a Foot of Rain in 24 Hours
(Weather Channel is reporting 14")
http://www.wunderground.com/blog/JeffMa ... ain-in-24-
“near-record levels of atmospheric moisture for this time of year–more than 200% of average–remain in place over the region, and renewed rounds of heavy rain are likely through Friday. Extreme flooding rains were spreading into Southern Arkansas on Wednesday morning, and rainfall amounts of a foot in 24 hours are possible there, as well. Additional major flash flooding over the next few days is also possible in Houston, San Antonio, Austin, Shreveport, Little Rock, Memphis and New Orleans….A large low pressure system (a “cut-off” low) has separated from the jet stream, and will stay parked over the U.S./Mexico border region during the next few days. The counter-clockwise flow of air around this low is bringing up plenty of warm, moisture-laden air from the tropics along the east side of the low, causing the heavy rains we’ve observed. By this weekend, when all of this rain has had time to flow into area rivers, expect to see several rivers crest at near-record flood levels. Sea Surface Temperatures (SSTs) are near average over the Gulf of Mexico, which will keep the amount of moisture available to this week’s storms lower than would be the case if SSTs were unusually warm. However, the cut-off low has tapped into a moisture source in the deep tropics over the Eastern Pacific where SSTs are record warm.”