The size of a bulge at the top of a thunderstorm’s anvil-shaped cloud may allow researchers to forecast the strength of tornadoes that spawn from such storms, according to a new study in AGU’s journal Geophysical Research Letters. Tornadoes, particularly those with strong winds, pose a serious threat to the property and lives of people…
GOES-17 instrument problem blamed on blocked heat pipe
WASHINGTON — A report released Aug. 1 concluded that a problem with an instrument on the GOES-17 weather satellite is likely caused by some kind of blockage in a system used to cool the instrument. NASA and the National Oceanic and Atmospheric Administration released a summary of the final report by a mishap investigation board…
Chicago is not tornado-proof. Here’s why.
Despite being known as the Windy City, Chicago has developed a false reputation as being impervious to tornadoes. In its history, Chicago has seen very few tornadoes compared with the rest of Illinois, which, as a whole, sees dozens of tornadoes annually and has endured the nation’s deadliest tornado, the 1925 Tri-State tornado that left…
Tornado activity shift puzzles scientists
WEST LAFAYETTE — Tornado season, generally spanning from March to June, is upon us. There were more than 130 reports of tornadoes across the country during the last two weeks of May, and earlier this year, 23 people were killed in a cluster of tornadoes near the border of Georgia and Alabama. Although tornado deaths…
Supercell: It’s the king of thunderstorms
Tornadoes are one of the most feared weather events on Earth. These quick-forming and normally short-lived cyclones tend to emerge from strongly rotating thunderstorms known as supercells. Driven by a long-lasting tower of rising air, these storms can unleash some of the fastest surface winds on Earth. Rising as much as 16.1 kilometers (10 miles)…
One day, 199 tornadoes
In 2011, an outbreak—not of disease, but of tornadoes—slammed through a large swath of the Southern and Eastern U.S. The region saw 64 individual twisters on April 25, and another 50 the next day, but the worst still lay ahead. A head-spinning 199 tornadoes touched down on April 27, killing 316 and injuring almost 3,000.…
Surprising discoveries on how tornadoes form and how climate change could make them stronger
Tuesday’s very rare and strong December tornado in Washington state comes as scientists are learning more than ever about how tornadoes form and why they seem to be growing more powerful. One of those studies says your eyes are deceiving you — tornadoes do not drop down from the clouds. In fact, it’s likely the…
Tornadoes Don’t Form Like Meteorologists Thought They Did
Picture a tornado forming. Does the funnel cloud in your mind’s eye reach down from the sky like a malicious, spindly finger? If so, that mental picture may be all wrong. New research suggests that tornadoes form not from the clouds down, but from the ground up. In a new study presented yesterday (Dec. 13)…
Surprise! Tornadoes form from the ground up
Call Dorothy—the formation of tornadoes has been knocked on its head. New measurements from tornadoes in Oklahoma and Kansas suggest these storms’ swirling winds first develop near the ground. That’s contrary to the long-accepted theory that tornado winds are born several kilometers up in clouds and only later touch down on Earth’s surface. Researchers analyzed…
U.S. tornado hot spots are shifting from the Plains to the Midwest and Southeast, study finds
Tornado frequency has increased across the eastern third of the United States and especially across the mid-South, according to a new study in the journal Climate and Atmospheric Science. While tornadoes have increased in the East, there has been a notable decrease in twister activity across a large chunk of the Southern Plains of Texas…