The threat of strong tornadoes, damaging hail and high winds is highest in the upper Midwest through Monday night. Severe weather and heavy rain will then stretch from the Great Lakes to the Southern Plains on Tuesday.

From current watches and warnings to outlooks and storm reports, we have all the maps you need to track this latest severe weather threat right here.

May's average number of tornadoes is the most of any month, with 260. Several atmospheric ingredients make May ripe for tornadic storms to develop, especially in the Plains and Midwest, which is home to the so-called "Tornado Alley."

Dramatic video shows how severe storms spawned a huge tornado in northwest Nebraska on Sunday. The twister derailed a train near Ashby, knocking over as many as 130 railcars.

Here's what we know so far about this widespread blackout.