On this first week of March, the threat of severe thunderstorms is rising in the nation's mid-section. Here's what you need to know about this, and how long this threat will last.

Winter weather advisories are in effect across the Northeast today for the potential for a mix of rain, snow and ice. Minor snow and ice accumulations look likely, but remember it won’t take much ice to make roads slick and dangerous. Travel will be impacted Tuesday into Wednesday morning. Watch this video for your hour-by-hour forecast to see where the worst impacts will be.

Some rush hour drivers in Buffalo, New York, probably thought heavy snow was going to be the worst of their commute, but then cows stopped them in their tracks. See what it took to corral one of the escaped bovine I-90.

Winter must be on vacation as spring-like weather will invade the eastern two-thirds of the country this week into the weekend. Hundreds of records highs and record warm lows will be in jeopardy. Even the chilly and snowy Northeast will see highs in the 60s and 70s this weekend. Watch this video to see the warmth move across the country.

While the spring equinox is on March 20, "meteorological spring" begins on March 1. Here's why.