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 developing tropical storm, moving just north of the large islands of the Caribbean, will take aim at the Bahamas and southern Florida into this weekend.
Regions dealing with Zika-carrying mosquitoes could have another threat to monitor as tropical activity picks up this season.
Following a tropical storm threat in the Bahamas and Florida into this weekend, an uptick in tropical systems will continue for the next six to eight weeks.
On the heels of deadly Typhoon Mindulle, Japan is bracing for another threat from Typhoon Lionrock next week.
A deadly earthquake struck central Italy at 3:36 a.m. local time on Wednesday with tremors felt as far away as the capital city of Rome.
Multiple tornadoes touched down across Indiana and Ohio on Wednesday, one of which flattened a Starbucks in the town of Kokomo, Indiana.
Washington, D.C. (1814)
Tornado struck part of Washington, D.C., killing many British soldiers who were burning the capitol.
South Carolina (1885)
Hurricane struck SC; $1.3 million damage at Charleston with many fatalities.
10 degrees in Bowen, coldest August temperature ever in United States.