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In a region that had been warned about potentially deadly flash flooding but hadn't braced for such a blow from the no-longer-hurricane, the storm killed people from Maryland to Connecticut on Wednesday night and Thursday morning.
The Texas area struck by Hanna has struggled to contain outbreaks of COVID-19 in recent weeks. Cases along the state's coast have soared into the tens of thousands.
The US National Hurricane Centre said Saturday that Hanna's maximum sustained winds had increased to 75 mph (120 kph). The storm was centred about 100 miles (160 km) east-southeast of Corpus Christi, Texas, and was moving west at 9 mph (15 kph).
The risk of outbreaks of diarrhoea and waterborne diseases is high as drinking water may be tainted with sewage, according to the Pan American Health Organization.
Dorian made a "catastrophic" landfall in the Bahamas on September 1 as a Category 5 hurricane, with winds reaching 295 km/h.
The US National Hurricane Centre warned that Dorian remained dangerous despite the reduced wind speed.
Potential damage to the Bahamas from Dorian could be exacerbated by the fact that its westward motion is forecast to slow, keeping it over the islands for longer.
The US is regularly pummelled by hurricanes. In 2017 one named Harvey became the strongest hurricane to make landfall in 12 years.
Mexican authorities urged residents to evacuate their homes for temporary shelters, closed ports, canceled classes and suspended beachside and marine activities.
Willa, a Category 3 storm on the five-step Saffir-Simpson scale was one of the most powerful hurricanes to enter Mexico from the Pacific in recent years.