The tornado frequency increases in the spring as the warm and cold seasons battle it out in the U.S.
Warm, humid air surges into the South during the spring months, while colder air remains in place across the northern tier of the country. The clash of warm, humid air and cooler, drier air to the north creates instability for thunderstorms to develop.
Another key ingredient for severe thunderstorm and tornado development is a powerful jet stream, or a corridor of fast winds around the altitude where planes fly. When there are powerful winds high in the atmosphere and weaker winds at the surface, a twisting motion in the atmosphere can help to produce rotating thunderstorms capable of spawning tornadoes.
During the spring months, the jet stream is often still potent across the U.S. before it shifts too far to the north during the summer to support violent storms with tornadoes touching down.
The sun's rays are also strengthening during the spring months, promoting increased daytime heating that further reduces the instability of the atmosphere.
Showery spells will be likely across much of the U.K. through the week.
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A cold front will ignite severe thunderstorms from eastern New England to the Delmarva Peninsula on Tuesday in the third consecutive day of unsettled weather for the region.
Hawaii will escape the worst, but not all of Guillermo's impacts as the tropical storm passes north of the islands Wednesday through Thursday.
A fall-like cooldown is in store through the end of the week for the Northeast.
Public officials are in the process of eliminating Naegleria Fowleri, a brain-eating amoeba, from two drinking water supplies in Louisiana.
Erie, PA (1915)
Flood killed 75 people, many streets flooded, bridges torn out.
Ossian, IA (1979)
Strong winds from a thunderstorm damaged a roller rink roof 50 miles NE of Waterloo, IA. A barn was destroyed and trees and power lines were downed.
Dallas, TX (1980)
A high of 95 degrees, breaking the string of 42 consecutive days of 100 degrees or higher.