Severe storms threaten central US from Texas to Illinois on Tuesday.

The National Weather Service has issued a Level 4 out of 5 risk zone over parts of eastern Iowa, northwestern Illinois and northeastern Missouri, where numerous tornadoes swarmed last week. A second zone with a Level 3 out of 5 risk of severe storms covers a portion of southeastern Oklahoma, northeastern Texas and southern Missouri, plus most of Arkansas. Over the entire severe-weather risk area, which affects over 45 million people, damaging winds and large hail will be a threat, in addition to tornadoes. On the storm’s cold side, a swath of heavy snow, possibly measured in feet, will combine with strong winds to deliver blizzard conditions over the Dakotas.