Preparedness & Recovery

Irma’s Winds Reach 185 mph as Powerful Storm Churns Toward Florida

As the hurricane churns closer to the U.S. coast, its path becomes more certain, with South Florida, particularly the Keys, increasingly likely to take a hit.

by Jenny Staletovich, Miami Herald / September 5, 2017
Map of Hurricane Irma. Tribune News Service 2017 TNS

(TNS) - Irma continued to strengthen into a powerful storm Tuesday afternoon, with winds increasing to 185 mph, National Hurricane Center forecasters said in a 2 p.m. EDT advisory.

As the storm continued to track westward, islands in its path raced to complete last-minute preparations. The Leeward Islands are expected to get hit with “catastrophic” winds Tuesday, forecasters said, with the Virgin Islands and Puerto Rico slammed Wednesday. In Puerto Rico, the governor asked President Donald Trump to declare a state of emergency, while the electric company warned Irma’s fierce winds could leave the island without power for four to six months.

As the hurricane churns closer to the U.S. coast, its path becomes more certain, with South Florida, particularly the Keys, increasingly likely to take a hit. Tropical storm force winds could arrive as early as Friday. Gov. Rick Scott has declared a state of emergency for all 67 counties and has ordered all 7,000 members of the state’s National Guard to report to duty on Friday. Mayor Carlos Gimenez also declared a state of emergency for Miami-Dade County Tuesday afternoon in advance of the fierce storm.

Because Irma is so large, stretching some 120 miles across, forecasters urged caution in paying too much attention to its exact track. The storm is continuing to roll west at 14 mph, with winds expected to begin battering the Leeward Islands Tuesday. A powerful high pressure ridge is steering the storm and will likely stay in place over the next few days, forecasters said. In five days, a trough moving across the U.S. should begin weakening the western edge of the ridge, allowing the storm to slide north. Where Irma makes the turn will determine impacts to Florida.

Monroe County announced that it will begin issuing mandatory evacuation orders for visitors at sunrise Wednesday. Residents will also be ordered to leave, although no time has yet been determined, county officials said. Schools and county offices will also be closed beginning Wednesday.

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

At 120 miles wide, Irma is nearly as wide as Florida.

In addition to the northern islands in the Antilles, hurricane watches have been issued for parts of the Dominican Republic and Haiti, the southeastern Bahamas and Turks and Caicos, with dangerous winds, storm surge and heavy rain expected Thursday and Friday. Puerto Rico’s government is preparing to open 456 shelters that can house more than 62,000. The Turks and Caicos has ordered Salt Cay, its southernmost inhabited island, evacuated beginning Wednesday.

Irma could strike a direct blow on the remainder of the Bahamas and Cuba later in the week, forecasters said. While impacts to Florida are less clear, forecasters said the likelihood of Irma hitting the Keys or parts of South Florida are increasing.

At 2 p.m., Irma was located 180 miles east of Antigua, heading west at 14 mph. While wind speeds could fluctuate over the next day or two, forecasters say it will likely remain a very dangerous Category 4 or 5 storm as it heads westward.

In addition to a state emergency, Scott said he asked Trump to request a federal emergency in advance of Irma’s arrival and began coordinating rescue efforts that include 13 helicopters and 1,000 high-wheeled truck capable of driving through high water. North Carolina’s National Guard is also on standby to help with evacuations from the Keys, if needed, and the National Guard is lining up an additional 30,000 troops, 4,000 trucks and 100 helicopters to be on standby, the governor’s office said in a statement.

The Florida Highway Patrol and Department of Transportation are also on standby to help with evacuation efforts, the statement said.

Utilities have been asked to begin posting outage and restoration information as the storm hits and are contacting other utilities to help out with repairs, Scott said in a statement. No fuel shortages have been reported, the statement said, but the state has contacted fuel suppliers in case emergency supplies are needed. The state insurance agency has also authorized early prescription refills.

Across the mainland, the South Florida Water Management District has already begun inspecting pumps and gates and lowering canals to make room for heavy rain, flushing as much water as possible starting in South Dade. In a morning press conference, Chief Engineer John Mitnik said he expects the storm to dump between eight and 10 inches of rain, but where it falls depends on Irma’s track. Unlike Harvey, Irma is not forecast to linger and deliver the kind of punishing rain that triggered widespread flooding and likely billions of dollars in damage. Mitnik said South Florida’s extensive system of canals are also capable of moving water quickly, however local drainage depends on flood controls set up in neighborhoods and subdivisions.

“If your particular subdivision was designed to have street flooding, then that’s what you’ll expect to see,” he said.

Timing is another issue.

“If you take 8 to 10 inches over several days, or compact it in 30 minutes, those are two different things,” he said.

The U.S. Army Corps of Engineers is also keeping a close eye on the aging dike around Lake Okeechobee, where water levels Tuesday were at 13.65 feet, still well below the 15.5 feet level where discharges begin and the more than 18 feet limit set to protect the dike.

While models have shifted Irma’s path up and down over the weekend, Tuesday morning’s runs largely agree on the storm’s path over the next three days, with less certainty after that.

Over the last week, Irma has also undergone repeated eyewall replacements, a common structural change for such massive storms. While the replacement may initially weaken the storm, it allows it to spread and grow in size. With each replacement, Irma has also been able to regain steam.

Meanwhile, Tropical Storm Jose formed in the fast east Atlantic Tuesday morning. At 11 a.m., the storm was located more than 1,500 miles east of the Lesser Antilles, moving west-northwest at 13 mph. Sustained winds reached 40 mph, with Jose reaching hurricane strength by Friday, forecasters said.

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