Hail in Antrim County, Michigan

Facebook photo of golf ball sized hail at the intersection of M 32 and US 131. Time estimated by radar.

Multiple thunderstorms tracked across northern Michigan during the afternoon, including a supercell thunderstorm that produced the EF-3 tornado that hit the town of Gaylord along with very large hail in other parts of the area.

Setting the stage for severe weather was a trough that rotated across the upper Midwest that developed and strengthened surface low pressure west of Lake Michigan. This system helped draw a warm, moist airmass northward across the state that helped provide the instability necessary to support severe thunderstorms later in the day. Storms initially formed along the cold front across Wisconsin during the morning hours and moved northeast across Lake Michigan, making it into the forecast area by early afternoon. The strongest line segment generated a measured wind gust of 76 mph at Frankfort Light and continued to produce damaging wind gusts across Leelanau and Antrim counties as it quickly moved northeast.

As this segment moved further away from the cold front, it began to transition into a supercell thunderstorm. This storm moved east-northeast across a very favorable environment in place across northern lower Michigan, eventually producing a tornado that caused considerable damage in the city of Gaylord. This supercell continued to trek across the area, producing baseball-sized hail in Posen.

For additional context, this was the first time in reliable recorded history (since 1950) that Gaylord was hit by a tornado. This was also the first significant tornado (EF2 or greater) in the county warning area since October 18, 2007.