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.
Three months after a drought state of emergency was declared in California, things have steadied temporarily for grape growers, but there is still a long way to go in the season.
A large storm will form over the eastern half of the nation next week and will bring a swath of unsettled conditions for days.
A slow-moving low pressure system will make residents of the Northwest reach for their raincoats and umbrellas each day through the remainder of the week.
With a growing demand among young adults to live in more connected, urban communities, it remains unclear if they will make the push toward a more environmentally sustainable future.
Surviving a flight in the wheel well of a commercial aircraft is possible, but highly unlikely due to subzero temperatures and thinner air than what is found at the peak of Mount Everest.
A seemingly never-ending debt cycle has many Americans searching to take matters into their own hands and an innovative Oregon couple may have found a solution that also benefits the environment.
Raleigh, NC (1980)
95 degrees - April record.
Laramie, WY (1983)
16" of snow (12" in 8 hours).
Eastern States (1986)
Heavy, wet snow on I-84 and other parts of the Poconos and Catskills. Snowfall totals included: Tobyhana, PA 24" Hawley, PA 18" Eldred, NY 24" Slide Mountain, NY 19" Lake Wallenpaupack, PA 16" East Stroudsburg, PA 14" East Jewitt, NY 16"