Think of it as Mother Natures roller-coaster ride: the shift between the weather patterns known as El Nio and La Nia that, at their worst, can cause havoc worldwide.

With El Nio fading, this years Pacific storm season, which starts Sunday, probably wont be as explosive.

An El Nio in the Pacific disrupted weather patterns to bring northern Alberta a dry fall and very little snow throughout the winter.

The next round of severe thunderstorms, tornadoes and heavy rain will sweep through the central U.S. Tuesday, only to be followed by more systems this weekend.

The 100-year event is a moving target, especially in an urban environment.

At least five of those storms will reach hurricane status, and two of them will become Category 3 or stronger.

He changed the way the world looks at hurricanes.

The average temperature across the lower 48 states was 36.8 degrees Fahrenheit 4 degrees higher than the 20th-century average breaking the mark set in 1999-2000.