The hurricane, which formed as a tropical storm on Wednesday, was intensifying in the eastern Atlantic, following behind Irma on a similar path. It lost some strength before it landed about 115 miles (185 km) northwest of the port city of Veracruz as a Category 1 storm with sustained winds 75 mph (120 km/h).
Here is a great tool from WNYC to monitor the progress of all three hurricanes (you can switch between storms by selecting the name of the storm on the top left).
NASA have released this remarkable satellite image of hurricanes Katia, Irma and Jose in the Caribbean and Gulf of Mexico.
In the Gulf of Mexico, Hurricane Katia made landfall late on Friday north of Tecolutla, Mexico and weakened to a tropical storm, with winds reaching 45 miles per hour.
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Irma is headed near the Turks and Caicos Islands, Cuba, and the Bahamas next.
Luis Felipe Puente, head of Mexico's national emergency services agency, said two people were killed by the hurricane, which roared onshore in Veracruz state, pelting the region with intense rains and winds. A hurricane watch is in effect from Cabo Rojo to the northern border of the state.
Irma, a Category 4 storm expected to make landfall in Florida on Sunday morning, has an ACE of 58.09 so far, according to data from the Tropical Meteorology Project at Colorado State University. The storm weakened as it moved west, and its remnants are now located near Hidalgo.
The US National Hurricane Centre (NHC) believe all three have the potential to hit land at the same time. This rainfall will continue the risk of life-threatening flash floods and mudslides, especially in areas of mountainous terrain.
At 7 a.m. CDT (8 a.m. EDT/1200 UTC) on September 8 the center of Hurricane Katia was located near 21.1 degrees north latitude and 95.6 degrees west longitude. The islands of Antigua and Barbuda are offline nearly entirely.