Supercell thunderstorms could produce multiple long-lived EF3 or stronger tornadoes today in the mid-Mississippi and lower Ohio valleys. Tornadoes, destructive straight-line winds and damaging hail will also impact a much larger area of the Midwest and South.

These are the most dire outlooks for severe weather NOAA's Storm Prediction Center issues. Here's what they mean and what you should know.

Double-digit rainfall totals are forecast, prompting the National Weather Service to issue “particularly dangerous situation” flood watches in some areas from Wednesday into Saturday. Serious flash flooding and flooding of rivers, creeks and streams can be expected.

Winter is not ready to hand over the reins to spring in the northernmost states just yet. Winter Storm Omari is bringing frozen precipitation to much of the northern tier this week, with heavy snow possible from the Dakotas to New England Wednesday into Thursday. Gusty winds will make travel hazardous and reduce visibility. We break it down here.

A highly anticipated test flight aimed at launching satellites from Europe ended when Isar Aerospace’s Spectrum rocket exploded 40 seconds after liftoff from a Norwegian spaceport. Despite the fiery crash, officials insisted the mission was a “success,” claiming the data collected will help refine future European space launches.