The remnants of Tropical Storm Lee are expected to cause more flooding in the northeastern United States after dumping heavy rain and triggering destructive tornadoes in southern areas of the country.

The U.S. National Weather Service has issued flash flood watches and advisories for areas from the Gulf Coast to New England.

On Monday, the storm sparked tornadoes that damaged dozens of homes in Georgia. It also caused widespread power outages and flooded roads throughout the south.

Tropical Storm Lee made landfall near the city of New Orleans, Louisiana on Sunday, flooding streets and recalling the devastation caused by Hurricane Katrina six years ago. Lee dumped more than 30 centimeters of rain on Louisiana and Mississippi.

Lee was later downgraded to a tropical depression.

Meanwhile, Hurricane Katia is swirling in the open Atlantic Ocean and heading northwest. The National Hurricane Center said in its latest bulletin that Katia is a category one storm on the five-point scale of hurricane intensity. The storm has winds of 150 kilometers per hour. Forecasters are warning of life-threatening rip currents and surf conditions along the U.S. east coast and Bermuda in the next few days.

Forecasters expect Katia to weaken as it passes between the U.S. east coast and Bermuda on Wednesday and Thursday.

September is considered the peak of the Atlantic hurricane season, which has already seen 12 named storms. The hurricane season began June 1 and ends November 30.