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The tornado reached peak intensity in the city of Greenfield, leading the National Weather Service in Des Moines, Iowa to assign a rating of mid-range EF4 on the Enhanced Fujita scale, with maximum wind speeds estimated at 185 mph (298 km/h).
At least four people were killed and 35 injured by an EF4 tornado that plowed through the center of Greenfield, Iowa, on Tuesday. Peak winds of 185 mph were estimated by the National Weather ...
After exiting Greenfield, this tornado moved east-northeastward, weakened, and dissipated over open terrain as the other tornado became the dominant circulation within the supercell. [ 82 ] The tornado was on the ground for 48 minutes, traveled 43.07 mi (69.31 km), and had a peak width of 1,600 yd (1.5 km).
National Weather Service teams are conducting surveys Wednesday after tornadoes hit Iowa. An initial survey showed at least EF3 damage in Greenfield.
Deadliest tornadoes in Iowa before 1950. The National Weather Service's tornado records only date back to 1950. Ratings using the Fujita Scale weren't introduced until 1971. The scale was later ...
The National Weather Service said initial surveys indicated at least an EF-3 tornado in Greenfield, but additional damage assessment could lead to a more powerful ranking. The tornado appeared to have been on the ground for more than 40 miles (64 kilometers), AccuWeather Chief Meteorologist Jon Porter said.
On May 21, a violent EF4 tornado struck the town of Greenfield, Iowa. As the tornado moved through the town, a Doppler on Wheels measured winds of at least >250 mph (400 km/h), "possibly as high as 290 mph (470 km/h)" at 48 yards (44 m) above the surface. [244]
As a deadly tornado cut a path across Iowa last month, storm chasers tracked it, gathering rare data that is now offering detailed, close-range insight into powerful twisters.