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Ten to 11 inches of rain has already inundated Alabama and Mississippi with more rain on the way.

The heaviest rain will be from Mississippi to Alabama to Florida over the next 24 hours.

New Orleans will continue to see showers and a few thunderstorms with another 1 to 2 inches of rain possible.

Slow-moving Nicholas is an especially dangerous threat for Louisiana, which is still recovering from deadly Hurricane Ida and other devastating storms in 2021 and 2020.

While we are working on recovery efforts from Hurricane Ida, our Public Works crews have been hard at work on drainage as we see some effects from TS Nicholas.

You can help by making sure that debris is not in the ditches & that the tops of culverts & catch basins are clear. pic.twitter.com/bDOAtDcnmb

— St. Charles Parish (@stcharlesgov) September 14, 2021
\"PHOTO:
Gerald Herbert/AP
PHOTO: Storm clouds from Tropical Storm Nicholas are seen behind homes in the Native American community of Isle de Jean Charles, La., which were destroyed by Hurricane Ida, Sept. 14, 2021.
>

As of Tuesday, about 87,000 customers in Louisiana were still without power from Hurricane Ida, Louisiana Gov. John Bel Edwards said.

Double state of emergency looks like THIS… a flash flood watch from #Nicholas on top of 17 day old #Ida damage here in LaPlace, Louisiana… pic.twitter.com/K5nu6FEuri

— Ginger Zee (@Ginger_Zee) September 15, 2021

Over 1,000 Louisiana residents remain at shelters in the wake of Ida, he said Tuesday.

The governor requested an emergency federal declaration, which was granted by President Joe Biden.

Before heading to Louisiana, Nicholas first struck the Houston area with over 6 inches of rain, shuttering schools.

\"PHOTO:
Brandon Bell/Getty Images
PHOTO: Debris and damaged road construction are left after Tropical Storm Nicholas moved through the area, Sept. 14, 2021 in Houston.
>
\"PHOTO:
Andrew Dubya via Reuters
PHOTO: A gas station roof is blown away by Tropical Storm Nicholas in Matagorda, Texas, Sept. 13, 2021.
>

In the Houston area, 460,000 customers were without power at the height of the storm early Tuesday, according to CenterPoint Energy. About 300,000 customers saw their power return by Tuesday evening.

\"PHOTO:
Jon Shapley/Houston Chronicle via AP
PHOTO: Jaime Ybarra and Frank Rivera, right, watch the wind and waves as Tropical Storm Nicholas heads toward the Texas coast, Sept. 13, 2021, along the seawall in Galveston, Texas.
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