![]() Experts say the increasing damage and deaths observed in recent years is in part due to increased urban sprawl, which means that any tornado has a greater likelihood of striking a populated area. But during that period, 67% of tornado deaths were attributed to tornadoes in those two classes. ![]() It is not possible to measure the wind speeds of a tornado directly, so researchers go in after the event and assess the damage to get an indirect measurement.Ä«etween 19, about 1% of all U.S. Preliminary estimates are that the storm measured EF-5 on the Enhanced Fujita Scale of tornado intensity, meaning that it had wind speeds of more than 200 mph. If the rest of the month had matched the first three weeks, Carbin said, May would have been a record slow month for tornadoes. Then the jet stream moved back north and the weather pattern became more tranquil. In April, the jet stream stalled in place for about two weeks, allowing a repeated series of local disturbances that translated into a series of tornadoes, which meteorologists call an outbreak. Some experts say this is because waters in the gulf are about 2 degrees warmer than normal for this time of year. The air from the south was unusually warm and moist for this time of year, according to Stu Ostro, a senior meteorologist at the Weather Channel. When the warm and cold air from different altitudes come together, it creates wind shear and circular air motions that lead to a tornado. Warm, moist air from the Gulf of Mexico moved north until it encountered cold air brought south by the jet stream.
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