Hanna, the first of the 2020 Atlantic hurricane season, made two landfalls on Saturday afternoon and evening in southern Texas, reports Xinhua news agency.

It weakened into a tropical storm early Sunday morning and moved toward northern Mexico, the National Weather Service said.

A flash flood and tornado watch are in effect in parts of the area until Sunday night.

Texas Governor Greg Abbott on Saturday issued a disaster declaration for 32 counties, calling for residents not to forget the existing threat of the COVID-19 pandemic.

"This challenge is complicated and made even more severe seeing that it is sweeping through an area that is the most challenged area in the state for COVID-19," he said.

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