Northshore deluge: A 500-to-1,000 year storm

A foot and more of rain in two hours, near biblical in amount of rain fall

Thomas Perumean
May 16, 2020 - 12:59 pm
Biblical amount of water fell Thursday night



Just how big was Thursday night’s rainstorm on the Northshore? 

According to the National Weather Service there hasn’t been downpour like that in 500-to-1,000 years. 

In two hours, 12-16 inches of rain fell in St. Charles and St. Tammany Parish. 

State Climatologist Barry Keim likens the downpour to two previous storms that hit in May 1995 and May 1978. 

Both storms caused widespread flooding and damage along the coast. 

“We expected this rain to end, and then this cell just sat on top of us and developed… and continue to dump rain,” St. Charles Parish President Matthew Jewell told the Times-Picayune/New Orleans Advocate

Jewell’s declaration of emergency came after hearing of 200-homes being inundated with floodwaters. 

St. Tammany Parish President Mike Cooper reported 25-to-30 homes flooded with Bedico Creek and Normandy Oaks getting hit the hardest.

8 to 12 inches of rain over New Sarpy and Destrehan in St. Charles, and 12 to 16 inches over locations just west of Madisonville in St. Tammany.

Even the rain gauge at Louis Armstrong International Airport set a record with 4.76 inches collected. 


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