A huge storm system crossing the U.S. threatens to unleash tornadoes Friday in the Mississippi Valley, blizzards in the northern Plains and dry, gusty conditions in Texas and Oklahoma that pose a high risk of wildfires.

The Storm Prediction Center has shifted the widespread severe weather threat just a little to the northeast, putting the very southwest corner of Lower Michigan in the chance of damaging wind gusts and even a strong tornado.

Strong tornadoes, winds gusting over 70 mph and destructive hail are possible.