Katia was initially measured as a Category 1 storm with 75 mph winds - far less powerful than Irma, which is quickly approaching Florida, and Jose which remains farther out in the Atlantic Ocean.
Then hours after hitting the coast, Katia weakened to a tropical storm with winds at just 45 mph.
At the same time, Irma strengthened back into a Category 5 storm Friday night, after weakening to a Category 4 earlier in the day.
The National Hurricane Center says Irma made landfall on the Camaguey Archipelago of Cuba late Friday and has maximum sustained winds of 160 mph.
Irma is about 300 miles from Miami and moving about 13 mph toward the west.
Farther out in the Atlantic, Hurricane Jose has almost hit Category 5 strength, with tops winds of 155 mph. Jose is about 265 miles east-southeast of the northern Leeward Islands.