Irma has the potential to cause the most damage, and the trifecta of hurricanes has experts anxious about the potential destruction from the back-to-back-to-back storms.
"It now looks like the Hurricane Watch Net will be working on two land-falling hurricanes", said HWN Manager Bobby Graves, KB5HAV. Southern Florida also marks the United States' most recent Category 5 landfall, which was Andrew in 1992. The governor had warned residents that Irma could be more unsafe than Hurricane Harvey, which hit Texas and Louisiana late last month.
French President Emmanuel Macron says he expects that victims and heavy damages will be discovered when Hurricane Irma has left the islands of Saint Martin and Saint Barthelemy in the French West Indies.
Tropical Storm Jose quickly strengthened to become a Category 1 hurricane on Wednesday, according to the National Hurricane Center.
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Meanwhile, the National Hurricane Center called Jose a "quickly strengthening" storm, with current max sustained winds at 75 miles per hour.
A lot will depend on the path and the strength of Irma as it moves North. The most unsafe winds, usually nearest to the eye, were forecast to pass near the northern Virgin Islands and near or just north of Puerto Rico on Wednesday.
Katia has triggered a hurricane warning in parts of Mexico, from Cabo Rojo to Laguna Verde, and a tropical storm warning is in place north of Cabo Rojo to Rio Panuco and south of Laguna Verde to Puerto Veracruz.
Storm activity usually ramps up in September - and hits its statistical peak on Sept. 10.
The Atmospheric Infrared Sounder or AIRS instrument aboard NASA's Aqua satellite measured at cloud top temperatures in Hurricane Katia's eastern side using infrared light.
The torrential rainfall from Katia may cause "life-threatening flash floods and mudslides, especially in areas of mountainous terrain", it said. Texas should stay dry. However, Jose is unlikely to make landfall.