Tropical Storm Henri left destruction in its path as it hurled down over the Northeast and in Tennessee, storm surges resulted in the death of at least 22 people.
The storm may strengthen to a hurricane before it hits New York and New England.
Elsa is no longer considered a tropical storm, but heavy rainfall and gusty winds are expected to persist.
Elsa battered southern coasts of Haiti and the Dominican Republic as Florida Gov. declares state of emergency in 15 counties.
The storm was expected to move into the Atlantic Ocean later in the morning, then travel near or south of Nova Scotia on Tuesday.
The vehicles are believed to have hydroplaned as Tropical Depression Claudette swept across the southeast. Nine of those killed were children, authorities said.
The impending storm forced postponement of weekend Juneteenth celebrations in Mississippi and Alabama.
The storm has left scores of people dead and over 100 others missing in Mexico and Central America after it made landfall as a category 4 hurricane.
Beta was brewing in the Gulf of Mexico, 205 miles southeast of Galveston, Texas, the U.S. National Hurricane Center said Sunday morning.
It could be the first time two hurricanes form in the Gulf of Mexico simultaneously, according to records dating to at least 1900.