Hurricane IsabelOne of Strongest to Hit U.S.?
Special for National Geographic News
|Updated September 17, 2003|
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For the past two weeks, the storm that's now Hurricane Isabel has been thrashing westward across the Atlantic Ocean, stoking itself on the tepid late summer waters and steadily growing into a monster with the power to level a city.
Since September 11, Isabel's strongest winds often exceeded 155 miles per hour (250 kilometers per hour). When hurricanes have winds this strong, meteorologists classify them as Category Five on the Saffir-Simpson Scale, which rates hurricanes according to wind speeds and destructive potential.
Category Five storms pack the energy of multiple atomic bombs. If one of these were to make landfall at full roar, the results would be catastrophic. Houses would be shattered, automobiles would be flung around like autumn leaves, soda straws would pierce oak trees, the sea would rise up higher than telephone poles and it would all be accompanied by an unearthly ear-splitting screech.
Luckily, the watery mechanism that creates and sustains these terrible storms is as quirky and delicate as it is powerful. A slight decrease in water temperature or the presence of powerful winds high in the atmosphere can shut off a hurricane's fuel and tear it apart, quickly sapping much of its power.
By Monday, the National Hurricane Center downgraded Isabel as a Category Four hurricane, with maximum sustained winds of near 140 miles per hour (220 kilometers per hour).
At 2 p.m. Eastern Time today, September 17, the center of Hurricane Isabel was located 350 miles (560 kilometers) south-southeast of Cape Hatteras, North Carolina, and expected to make landfall in the eastern part of the state during the day tomorrow.
Isabel is now a Category Two hurricane, with maximum sustained winds near 105 miles per hour (169 kilometers per hour) and higher gusts extending outwards up to 115 miles (185 kilometers) from the storm's center. Storm surge flooding of seven (2.1 meters) to 11 feet (3.35 meters) above normal tide levels may be expected, while storm total rainfalls of six to ten inches (150 to 250 millimeters) are likely. There is also the threat of isolated tornadoes in association with Isabel.
When Powerful Hurricanes Come Ashore
While powerful hurricanes do sometimes come ashore, it's unusual for a Category Five storm to make landfall in the United States. In fact, it's happened only three times since hurricane record keeping started in 1886. The most recent time was August 24, 1992, when Hurricane Andrew's 170-mile-per-hour (275-kilometer-per-hour) winds changed the face of South Florida.
On August 18, 1969, Hurricane Camille roared off the Gulf of Mexico and slammed into Mississippi with 190-mile-per-hour (300-kilometer-per-hour) winds and a storm surge that buried oceanfront buildings beneath 25 feet (7.6 meters) of seawater.
But the storm that set the standard for sheer power smashed into the Florida Keys on Labor Day Monday of 1935. Unlike Isabelwhich achieved its massive power while still far out at seathis anonymous killer waited until the last minute to intensify into a force of incalculable power. It was a minimal tropical storm when it crossed the Bahamas with 40-mile-per-hour (65-kilometer-per-hour) winds during the night of August 31September 1.
Something happened to this storm when it reached the warm waters of the Straits of Florida, however. In a mere 36 hours, this hurricane's winds exploded. When the storm smashed into the Keys on the evening of September 2, 1935, its strongest winds probably exceeded 200 miles per hour (320 kilometers per hour), and it inundated the low-lying islands with a storm surge of perhaps 22 feet (6.7 meters).
The Keys were sparsely populated in those days, but about 400 wretchedly unlucky men took the full force of this awful hurricane when it came ashore. They were World War I veterans working on a Depression-era New Deal highway construction project in the Upper Keys. They were housed in flimsy oceanfront work camps only a couple of feet above sea level, and the men in charge of the camps waited until too late to call for a train to get the vets off the islands. There was almost nothing between them and the unrestrained fury of this cataclysmic hurricane. When it was over, about 260 of the vets were dead, along with at least 150 Keys residents who'd been in the hurricane's path.
The storm also performed astonishing feats of strength. As it approached the Keys, its fearsome winds shoved the ocean about a quarter-mile (400 meters) offshore from Lower Matecumbe Key, held it there until the hurricane's eye had passed and the winds changed direction, and then hurled the water back at the island in the form of a roaring white-foamed mountain of water that completely covered the key and swept away dozens of vets. The hurricane's storm surge crashed into the would-be rescue train at Islamorada, Florida with such force that cars weighing 100 tons were lifted off the tracks like children's toys. And it pitched an ocean liner carrying almost 400 people onto a reef off Key Largo.
The storm made headlines across the United States for a few days, and the deaths of the luckless veterans made the hurricane a truly national tragedy. But the Florida Keys were remote and insignificant in 1935 and the veterans were unimportant to most of the nation, and the hurricane quickly faded from public consciousness.
A handful of old-timers in the Keys still have vivid memories of that awful Labor Day. They shake their head in rueful disbelief when they hear newcomers to the islands say they'd like to see a hurricane. They heard the doomed vets say the same thing 68 years ago.
Willie Drye is the author of Storm of the Century: The Labor Day Hurricane of 1935, published by National Geographic Books. Drye lives in Plymouth, North Carolina.
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