While tornado activity is most prominent in the springtime, autumn can bring a secondary peak — and the twisters can be even stronger and more dangerous.

El Nino and La Nina alternate as part of the ENSO cycle, but not according to a fixed or predictable schedule.

Forecasters are calling for a dark and stormy Halloween in the Los Angeles area, with rain expected Friday through Sunday.

In Hawaii, westerly tradewinds are rare.

High clouds gave way to sunshine, as our gorgeous autumn weather pattern continues.

Forecast models show the polar vortex could reverse direction in early November, potentially influencing U.S. weather patterns later in the month.

A warm-up will spread across Michigan today. Some high temperature records could be set, particularly in Northern Michigan. Temperatures are expected to reach into the 70s across much of the Lower Peninsula, which is about 15 degrees higher than the normal daytime highs in late October.

Minnesota will see a mild and humid Wednesday with some patchy sunshine before scattered thunderstorms develop during the afternoon and evening. The Twin Cities metro faces a Level 2 slight risk for severe weather.