Tropical Storm Nicholas slowed to a crawl over the Houston area Tuesday after making landfall earlier as a hurricane, knocking out power to a half-million homes and businesses and dumping more than a foot (30.5 centimeters) of rain along the same area swamped by Hurricane Harvey in 2017.

Nicholas could potentially stall over storm-battered Louisiana and could bring life-threatening floods across the Deep South over the coming days, forecasters said.

Nicholas made landfall early Tuesday on the eastern part of the Matagorda Peninsula and was soon downgraded to a tropical storm. It was about 10 miles (15 kilometers) southeast of Houston, Texas, with maximum winds of 45 mph (75 kph) as of 10 a.m. CDT Tuesday, according to the National Hurricane Center in Miami.

Galveston saw nearly 14 inches (35 centimeters) of rain from Nicholas, the 14th named storm of the 2021 Atlantic hurricane season, while Houston reported more than 6 inches (15 centimeters) of rain. That’s a fraction of what fell during Harvey, which dumped more than 60 inches (152 centimeters) of rain in southeast Texas over a four-day period.

Adrian Bentancourt cleans up debris from a fence that was blow down by Hurricane Nicholas Tuesday, Sept. 14, 2021, in Galveston, Texas. (AP Photo/David J. Phillip)

Nicholas is moving so slowly it will dump several inches of rain as it crawls over Texas and southern Louisiana, meteorologists said. This includes areas already struck by Hurricane Ida and devastated last year by Hurricane Laura. Parts of Louisiana are saturated with nowhere for the extra water to go, so it will flood, said University of Miami hurricane researcher Brian McNoldy.

“It’s stuck in a weak steering environment,” McNoldy said Tuesday. So while the storm itself may weaken “that won’t stop the rain from happening. Whether it’s a tropical storm, tropical depression or post-tropical blob, it’ll still rain a lot and that’s not really good for that area.”

The storm was moving north-northeast at 6 mph (9 kph) and the center of Nicholas was expected to move slowly over southeastern Texas on Tuesday and over southwestern Louisiana on Wednesday.

Nicholas, expected to weaken into a tropical depression by Tuesday night, could dump up to 20 inches (51 centimeters) of rain in parts of southern Louisiana. Forecasters said southern Mississippi, southern Alabama and the western Florida Panhandle could see heavy rainfall as well.

Much of Texas’ coastline was under a tropical storm warning that included potential flash floods and urban flooding. Texas Gov. Greg Abbott said authorities placed rescue teams and resources in the Houston area and along the coast.

In Houston, officials worried that heavy rain could inundate streets and flood homes. Authorities deployed high-water rescue vehicles throughout the city and erected barricades at more than 40 locations that tend to flood, Mayor Sylvester Turner said Monday.

“This city is very resilient. We know what we need to do. We know about preparing,” said Turner, referencing four major flood events that have hit the Houston area in recent years, including devastating damage from Harvey.

Meteorologist Kent Prochazka of the National Weather Service told The Associated Press early Tuesday that Nicholas’ winds downed trees in coastal counties and caused some gas stations to lose awnings.

“Right before it made landfall, it abruptly intensified into a hurricane and as it moved inland, the pressures began to rise with it. The winds have relaxed slightly and now we’re getting down into tropical storm force (winds),” he said.

More than 500,000 homes and businesses were without power in Texas by midmorning Tuesday, according to the website poweroutage.us that tracks utility reports.

Numerous school districts along the Texas Gulf Coast canceled classes Monday and Tuesday because of the storm. The weather threat also closed multiple COVID-19 testing and vaccination sites in the Houston and Corpus Christi areas and forced the cancellation of a Harry Styles concert scheduled for Monday evening in Houston.

A tornado or two may be possible Tuesday along the upper Texas and southwest Louisiana coast, according to the weather service.

Nicholas brought rain to the same area of Texas that was hit hard by Harvey, which was blamed for at least 68 deaths, including 36 in the Houston area. After Harvey, voters approved the issuance of $2.5 billion in bonds to fund flood-control projects, including the widening of bayous. The 181 projects designed to mitigate damage from future storms are at different stages of completion.

McNoldy, the hurricane researcher, said Nicholas is bringing far less rain than Harvey did.

Cyclist make their way down a street in Bay City, Texas as Tropical Storm Nicholas approaches on Monday, Sept. 13, 2021. (Elizabeth Conley/Houston Chronicle via AP)

“It’s not crazy amounts of rain. It isn’t anything like Hurricane Harvey kind of thing with feet of rain,” McNoldy said. Harvey not only stalled for three days over the same area, it moved a bit back into the Gulf of Mexico, allowing it to recharge with more water. Nicholas won’t do that, McNoldy said.

Louisiana Gov. John Bel Edwards declared a state of emergency Sunday night, ahead of the storm’s arrival in a state.

On Monday, Misty Tran dreaded the thought of Nicholas reaching as far east as her home south of New Orleans in Empire, Louisiana. Ida damaged the roof of Tran’s mobile home. A tarp covers the roof now, Tran said, but it wouldn’t be a match for a even a weak storm.

“A tarp can only do so much,” said Tran, helping clean up at a marina where she works.

The storm was expected to bring the heaviest rainfall west of where Ida slammed into Louisiana two weeks ago. Ida has been blamed for 86 deaths throughout the United States. Across Louisiana, about 95,000 customers remained without power Tuesday morning, according to poweroutage.us.

Colorado State University hurricane researcher Phil Klotzbach said via Twitter that only four other years since 1966 have had 14 or more named storms by Sept. 12: 2005, 2011, 2012 and 2020.

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