Cat. 5 Hurricane Irma now stronger than Hurricane Andrew in '92

(ABC NEWS) – Hurricane Irma has strengthened to a Category 5 storm and catastrophic damage is possible in the Florida Keys and southern Florida this weekend, as a second storm has formed behind it.

Irma was packing 185 mph winds and gusts up to 220 mph as of before 2 p.m. ET Tuesday and is expected to continue churning with deadly hurricane-force winds and a dangerous storm surge across a wide swath of the Caribbean this week before moving toward southern Florida, according to the National Hurricane Center (NHC).

Meanwhile, Tropical Storm Jose has formed over the open Atlantic, following closely behind Irma, the NHC said Tuesday. Jose could become a Category 2 hurricane as it brushes the most northeastern Caribbean islands at the end of the week. However, there is no threat to the U.S. or Puerto Rico at this time. The NHC warned that residents in the Leeward Islands, already expected to face Irma, “should monitor the track.”

The NHC on Tuesday called Irma the strongest hurricane in the Atlantic basin outside of the Caribbean Sea and Gulf of Mexico in NHC records.

Hurricane warnings are in effects for islands including the U.S. territory of Puerto Rico, where the governor Tuesday called the storm unprecedented as the island braces for Irma to hit this week.

By Sunday around 8 a.m., the hurricane is expected to be near the Florida Keys with winds of 145 mph as a Category 4 hurricane.

As of Tuesday morning, the NHC predicts that the storm will follow a more western track, heading up the west coast of Florida; however, that still could change.

Florida Gov. Rick Scott on Monday declared a state of emergency for every county to ensure that local governments have enough “time, resources and flexibility to get prepared for this dangerous storm,” according to a statement from his office.

Scott said in the statement that Irma is a “life-threatening” storm and Florida “must be prepared.”

“In Florida, we always prepare for the worst and hope for the best,” Scott said, “and while the exact path of Irma is not absolutely known at this time, we cannot afford to not be prepared.”

The University of Miami has canceled classes for Wednesday, Thursday and Friday, the school announced Tuesday.

In Monroe County, Florida, which includes the Florida Keys, visitors will be under a mandatory evacuation order beginning Wednesday morning, according to the county.

Residents will also face evacuations, and while a start time has not been determined, the county encourages people to start evacuation plans now and leave the Keys early to avoid facing traffic.

The Florida Keys experienced massive flooding from Hurricane Wilma in 2005, which was a Category 3 storm. The last Category 5 storm to make landfall in the Florida Keys was the Labor Day hurricane of 1935.

“If ever there was a storm to take seriously in the Keys, this is it,” Monroe County Emergency Management Director Martin Senterfitt said in a statement released by the county. “The sooner people leave, the better.”

The Monroe County School District is shuttering schools Wednesday, the statement added.

Broward County, Florida, Mayor Barbara Sharief said Tuesday that Broward County will feel tropical storm-level winds by Friday. The mayor said those who live in an evacuation zone should plan to evacuate, adding that extra shelters will be available.

Category 5 is the strongest hurricane category on the Saffir-Simpson hurricane strength scale. In a Category 5 storm, winds reach more than 157 mph and damage is expected to be catastrophic, with buildings and roofs destroyed.

The Carnival Cruise Line has diverted four ships carrying more than 13,000 passengers to maintain a “safe distance” from Irma, a spokesperson said.

“The safety of our guests and team members is our first priority,” the company said in a statement. “We will continue to make adjustments as necessary.”

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