NEW ORLEANS—Tropical Storm Nate rapidly weakened as it moved over Alabama on Sunday, although the fast-moving former hurricane rattled the doors of Biloxi’s casinos and left gambling floors and highways in the region flooded after making its landfall in Mississippi.

Cars drive through a flooded road in Mobile, Alabama on Oct. 8, 2017, in this still image taken from a video obtained from social media. Michael Schubert/social media/via REUTERS
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