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.
Moisture from Odile brought flooding rainfall to the Southwest on Wednesday and more is on the way.
The risk of flooding from Odile will spill onto Texas and parts of the southern and central Plains late this week into the weekend.
Torrential rainfall slammed parts of Serbia over the weekend, resulting in two deaths as rushing waters sliced through area streets.
Igniting across Northern skies, ghostly rivers of light dance overhead each year, emitting vibrant shades of green, blue, pink, red and violet.
On Tuesday, Edouard became the first major hurricane in the Atlantic since Sandy. While Edouard remains at sea, rough surf will reach some Atlantic coast beaches.
Moisture from Tropical Rainstorm Odile will deliver torrential rainfall and cause life-threatening flooding over the interior Southwest through the balance of the week.
Eastern States (1990)
Record cold in many locations.......... Location Temp Previous Record ----------------- ---- --------------- Rochester, NY 37 38/1953 Youngstown, OH 34 38/1959 Atlantic City, NJ 36 39/1968 Allentown, PA 36 37/1959 Providence, RI 39T 39/1959 Binghamton, NY 35 36/1953 Flint, MI 35 36/1959
New York, NY ()
4" of rain fell from an early nor'easter.
Eugene, OK ()
0.18" of rain - first measurable rain since June 27, 1998. Longest dry spell record.