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.
A 21-year-old California woman died recently after contracting a rare infection caused by a brain-eating amoeba that thrives in warm bodies of water.
Holiday festivities may be disrupted by severe thunderstorms into Saturday evening across the northern Plains.
It will not just be emotions running high around Vancouver, Canada, Sunday afternoon for the final match of the 2015 Women’s World Cup, but also temperatures.
Strong and locally dangerous thunderstorms will ignite from northwestern Minnesota to northeastern Colorado during Sunday. Storms will extend from upper Michigan to northwest Texas on Monday.
While the Philippines will escape Chan-hom, the same cannot be said for Tropical Storm Linfa.
Americans will be hoping for clear skies this Saturday, July 4, as they look to enjoy dazzling fireworks displays, in addition to other popular Fourth of July activities.
White Face Mt., NY (1979)
Two inches of snow; temperature at 31 degrees.
Meadville, PA (1981)
A total of 1.50 inches of rain in just 18 minutes.
Wilmington, DE (1989)
A total of 6.63 inches of rain -- all-time 24-hour record.