Tropical Storm Jose, heading for the Caribbean, strengthened to a hurricane on Wednesday and could become a major Category 3 storm by Friday, the US National Hurricane Center said.
Jose was about 1,040 miles (1,675 km) east of the Lesser Antilles, packing maximum sustained winds of 75 miles per hour (120 kph), the NHC said in an advisory.
Katia, a storm off the Mexican coast in the Gulf of Mexico, strengthened into a hurricane on Wednesday, the US National Hurricane Center (NHC) said.
Katia is 185 miles (295 km) east of Tampico, Mexico, packing maximum sustained winds of 75 miles per hour (120 kph) and some additional strengthening is forecast during the next 48 hours, the NHC added.
Models so far show it remaining in the southern Gulf in coming days.
The storms come on the heels of Hurricane Harvey, which brought massive destruction to Houston and other parts of southern Texas, as well as Hurricane Irma, which made landfall in Barbuda on Wednesday and continued on towards Puerto Rico and the US Virgin Islands.