Tropical storm Barry has dumped as much as 17 inches (43.2 cm) of rain in some parts of Louisiana since it crawled north onto the state's coast on Saturday.
Barry, which made landfall on Saturday as a Category 1 hurricane on the five-step Saffir-Simpson scale of intensity and then quickly weakened to a tropical storm, is expected to break up into a post-tropical depression, forecasters said.
Barry moved agonizingly slowly across Louisiana, expected to arrive Monday in Arkansas, producing thunderstorms and torrents of rain that may cause widespread flooding.
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As of Sunday morning, more than 100,000 customers in Louisiana had no electricity.
"We're thankful that the worst-case scenario did not happen", said Louisiana Governor John Bel Edwards after President Donald Trump had declared a state of emergency, authorizing federal funds to help local authorities. The danger of flash floods prompted closure of several roads in Lafayette, southwest Louisiana's largest city and cultural center, as well as all roads in nearby New Iberia.
More than 90 people were rescued in 11 parishes, but there were no reports of weather-related fatalities, Mr Edwards said.
He added: "This was a storm that obviously could have played out very, very differently".
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The remnants of the storm are expected to move up through Arkansas into the Midwest through the middle of the week. The 8 to 20 inches of rain originally predicted would have overwhelmed the city's aging drainage system, at the center of which is a system of 120 drainage pumps used to push water out of the low-lying city.
Mr Edwards thanked the public for taking officials' warnings seriously over the weekend, but he also reminded residents that it is still relatively early in the Atlantic's hurricane season.
He said: "Based on what we've experienced, I think (we will be) even better prepared for next time - and we do know that there will be a next time".
14-Juillet: l’heure de la remobilisation ?
Une dizaine de pays européens partenaires de l'armée française étaient conviés pour le défilé du 14-Juillet à Paris. Parmi les hélicoptères au-dessus de Paris figuraient aussi deux Chinook britanniques.