The National Weather Service issued a tornado warning for Carmel, Fishers, Noblesville after a twister was spotted in Zionsville, Indiana on Wednesday.

When a warning is issued, take action. This means tornado conditions are imminent and have been spotted either by someone on the ground or by radar. Warning areas are typically smaller than those within a watch and are issued for a shorter time period, typically about 15 minutes.

A powerful, wide-reaching spring storm is threatening parts of the central and eastern US, with a life-threatening outbreak of long-lived and strong tornadoes possible in some areas. Follow here for live updates.

Bloomington is under a severe thunderstorm warning along with several other cities in central Indiana as thunderstorms blow east, according to the National Weather Service.

Up to 59 million from Texas to Michigan are under severe storm risk as heavy rains, flash flooding and strong tornadoes are forecast to hit the lower Ohio Valley and the mid-South.

Winds will increase today and push temperatures into the upper 70s, then severe storms will move in tonight. Brandon has the breakdown of our timeline here.

Here's what's being predicted for Sunday by NWS, Accuweather, Weather Channel as they watch a system that could bring hail, tornadoes.

The afternoon forecast calls for potential severe weather., but it may be isolated. The Storm Prediction Center calls for a Level 3 risk for most of the Chicago area. The second, stronger line of storms is expected to pass through from 2 to 8 p.m. Areas along and south of Interstate 80 are at the highest risk for severe weather.

The National Weather Service has placed Johnson County under a moderate risk of severe weather for Wednesday. A moderate risk is the second-highest level on the weather service’s severe thunderstorm risk categories, and indicates there will likely be widespread severe storms that could be “long-lived” or intense.