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A street flooded after Tropical Storm Nicholas moved through Galveston, Texas, on Tuesday. Photo: Brandon Bell/Getty Images

Southwest Louisiana faces a "high risk" of flash flooding from Tropical Depression Nicholas on Wednesday morning, the National Weather Service warned.

Why it matters: Such "high risk" outlooks are rarely issued anywhere in the U.S. There's also a medium risk of flash-flooding in New Orleans, which is still reeling from Hurricane Ida striking the state last month.

The flood warning zone covers more than half of Louisiana. Photo: National Weather Service/NOAA

Our thought bubble: The alert is due to the former hurricane slowing down its forward movement. As the bands of rain work east, they're moving into ground more saturated in the wake of Ida — which raises the risk of flash flooding in the rest of Louisiana as well as parts of Mississippi.

Threat level: Rain from the slow-moving storm was expected to produce 5 to 10 inches of rainfall across parts of southern and central Louisiana, southern Mississippi, far southern Alabama, and the western Florida Panhandle through early Friday, the NHC said late Tuesday.

  • Isolated storm totals of 20 inches were possible from southern Louisiana to the far western Florida Panhandle.
  • "Life-threatening flash flooding impacts, especially in urban areas, are possible across these regions," the NHC warned.

By the numbers: More than 125,000 customers were without power in Texas and over 75,000 others in Louisiana had no electricity on Wednesday morning, according to the utility tracking site poweroutage.us.

The big picture: Nicholas made landfall near Sargent Beach, Texas, as a Category 1 hurricane early on Tuesday.

  • It later weakened to a tropical depression, but continued to dump heavy rains on the Houston metro area as it slowly moved its way over southeastern Texas and southwestern Louisiana.
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Go deeper

Updated Sep 14, 2021 - Science

Hurricane Nicholas makes landfall in Texas

Weather conditions are seen in Galveston, Texas, ahead of Hurricane Nicholas. Photo: Brandon Bell/Getty Images

Hurricane Nicholas made landfall near Sargent Beach, Texas, Tuesday morning — threatening to bring up to 18 inches of rainfall and flooding to parts of the state and Louisiana, per the National Hurricane Center.

What's happening: Heavy rains, high winds and "dangerous" storm surges were ongoing, said the NHC, confirming just before 2am that the Category 1 hurricane had hit the state. Nearly 200,000 customers had lost power in Texas by 3:30am, per the utility tracking site poweroutage.us.

2020 was the deadliest year for environmental defenders

Engineer Sandra Cuéllar is one of many Colombians who've gone missing or been killed for their environmental activism. Photo: Luis Robayo/AFP via Getty Images

Latin America and the Caribbean is the deadliest region for environmental defenders, a violent record that has global repercussions.

Why it matters: The region has several of the most biodiverse areas of the planet, but they are constantly threatened by logging, mining or aquifer overexploitation.

2 hours ago - Politics & Policy

Senate offices closing ahead of "Justice for J6" demonstration

Security fencing outside the U.S. Capitol ahead of a planned "Justice for J6" rally in Washington, D.C.. Photo: Stefani Reynolds/Bloomberg via Getty Images

Multiple congressional offices will be closed Friday amid security precautions ahead of Saturday's rally in support of jailed Jan. 6 rioters, aides who have been instructed to work remotely tell Axios.

Why it matters: As the U.S. Capitol faces its first large-scale security test since the deadly attack, House and Senate offices are taking precautionary measures to protect staff as well as lawmakers.