An upper-level low pressure system and an area of low pressure slide east along the Gulf Coast and combined to deliver the drenching downpours. The surface low pressure system in the Gulf of Mexico formed partially in response to the mid- and upper-level remnants of Hurricane Patricia. Also involved is the leftover moisture from Patricia.
This setup resulted in flooding along parts of the Texas Gulf Coast, including the Houston metro area, on Saturday. Many roadways and vehicles were reported to be under water around Houston Saturday night. Other parts of Texas have also seen flooding in recent days, with localized rainfall totals of more than one foot. Corsicana, Texas, has already received more than 20 inches of rain since Thursday, causing serious flash flooding.
New Orleans International Airport recorded 8.67 inches of rain on Sunday, making it the fourth wettest calendar day on record there dating to 1946.
On Monday, the heavy rain moved farther east with more than 4 inches of rain reported in Mobile, Alabama and Pensacola, Florida
http://www.weather.com/forecast/regional/news/patricia-gulf-coast-lower-mississippi-valley-flooding
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