Learn how derechos form, what causes these powerful windstorms, and where they most often hit in the United States.

4Warn Weather – Tracking storms with the possibility for tornadoes tonight across much of lower Michigan ... supercells will combine to form a squall line, which could bring large hail over ...

Storms are expected in the Ohio, Tennessee and Mid-Mississippi valleys, where there are threats of tornadoes, damaging winds ...

The strong squall line that produced multiple severe storms through the overnight has pushed northeast out of the area, and the severe threat is now over. Remember to download the free 4Warn ...

The storms transformed into an intense squall line as they marched east into Michigan and Indiana on Thursday night, carrying a wall of wind that led to damage reports across much of the state.

Michigan woke up to 250,000 outages ... There could also be some hurricane-force winds as storms merge into a squall line. Scattered rotating supercells will form in southeast Missouri and ...

Northeast Indiana/northern Ohio/southern Michigan: Earlier supercells merge around 9 or 10 p.m. into a squall line with embedded kinks of spin. Damaging gusts and a few quick-hitting tornadoes are ...

Residents of Livingston County and surrounding areas in Michigan experienced severe ... the aftermath of a potent squall line left the county reeling from minor flooding, fallen trees, and ...

The Michigan Storm Chasers noted that a large squall line will likely overtake the western part of the state beginning around or just after 8 p.m. EDT. This squall line is expected to span from the ...

So the next time you hear about a squall line in the forecast, take it seriously. These storms might not look like classic tornado setups, but they can be just as deadly. Download the FOX13 ...