The first full week of spring has arrived, but it may feel a bit more like summer for much of the western and central U.S. where dozens of record highs are poised to be broken. Cities like Denver, Dallas, Sacramento, Flagstaff and Portland could break daily record highs this week as warm temperatures spread across the country. Overnight temperatures will also stay warm, preventing much relief in the cooler hours.

Mandatory evacuations were underway in Polk County, North Carolina, as firefighters battled three blazes. In South Carolina, Gov. Henry McMaster declared a state of emergency due to wildfires. And in New Jersey, a wildfire was burning in Wharton State Forest, which forced the evacuation of two campgrounds and closed several roads.

An iceberg broke off of the Antarctic ice sheet, and as scientists studied the deep ocean where the ice once was, they found ecosystems teeming with sea spiders, corals, ice fish and possibly dozens of new species. The discovery could provide new information about how deep-sea life changes as the planet warms.

Tornadoes can strike any time of year, but April, May and June are the most active months, especially when it comes to very large, destructive tornadoes.

Tornadoes can strike in any month, but areas of the country are at a bigger risk depending on the month. Here is the breakdown by season.