Reading Tree Damage, Barometric Pressure
One of the earliest people to record how hurricanes were different from other storms was William Redfield. After a hurricane hit Connecticut in 1821, Redfield deduced that the storm’s winds moved in a large cyclone based on the different directions that trees had been blown down in the storm’s path.
Although other people had observed unique aspects of hurricanes before Redfield, “he’s kind of regarded as the father of hurricane research,” says Cary Mock, a geography professor at the University of South Carolina.
Redfield corresponded with British engineer William Reid, and their collaboration informed Reid’s 1838 book The Law of Storms. In 1847, Reid—who at various points was governor of Bermuda, Barbados and Malta—set up an early storm warning system in Barbados. He instructed police in the capital of Bridgetown to take regular barometric readings and signal if there was a sudden drop in pressure, suggesting an incoming storm.
By the time Viñes made his hurricane forecast in 1875, the U.S. government had established its first weather service under the Army Signal Service. In 1891, the United States transferred this weather service to the Department of Agriculture and renamed it the Weather Bureau. The bureau’s headquarters were in Washington, D.C., but it received weather observations by telegraph from many regional sources.
1900 Galveston Hurricane: Incorrect Forecast Cost Lives
The bureau’s most significant failure came in September 1900, when a hurricane hit Galveston, Texas, killing an estimated 8,000 to 12,000 people. The D.C. office had predicted that the hurricane would pass up to New England, but meteorologists at the Belén Observatory in Havana, who had continued Viñes’ work of hurricane observation, warned the bureau that the hurricane was actually barreling toward Texas.
The D.C. office ignored Havana’s warning and issued its own, incorrect forecast. As a result, the people of Galveston didn’t receive proper warning of the in coming storm. The Galveston hurricane remains the most deadly natural disaster in U.S. history.
Telegraphs, Ships, Planes Improve Tracking
By the 1920s, forecasters used a variety of methods to try to anticipate hurricanes. They could observe barometric pressure, cloud patterns and ocean swells to predict when a storm might occur locally. They could also receive telegraph and wireless reports about where storms were already occurring, and try to predict where they were going.
Some of these reports came from ships that encountered hurricanes at sea. Once ships received word that a hurricane was in a certain area, they would usually avoid that area—which was good for the ships, but led forecasters to lose track of where a hurricane was. These “lost hurricanes” could then sneak up on islands and coastlines without warning. However, the invention of airplanes gave meterologists a new tool to find them.
In September 1935, Captain Leonard Povey, an American working for the Cuban Army Air Corps, set out in an open-cockpit plane to locate a hurricane that seemed to be moving in a different direction than meteorologists had predicted. He found the hurricane, and observed it by flying around the periphery. According to his observations, it looked like it was heading toward the Florida Keys, and officials issued an hurricane warning to the area.