A derecho is a windstorm. Tornadoes have their destructive force from spinning winds, but a derecho's winds go in a straight line that can travel for hundreds of miles.

Here's the storm on its way, with damage reports as I can collect them as it heads towards Ann Arbor. The loop below is from the Grand Rapids radar.

For current weather information see the Ann Arbor weather link at the top of the page; click the temperature to see a map.

Power outages

The DTE power outage map page on Arborwiki has a direct link to the DTE map plus notes on each previous storm.

Damage to the west of the area

• Chicago
• South Bend: Indiana Michigan Power reports 75000 without power at 11:45 p.m.
• Kokomo: a storm report from Kokomo reports a "crazy night", and frustration with event planners who didn't have severe weather plans for their outdoor event.
• Kalamazoo
• Battle Creek
• Jackson

Historic derechos

• "The Ohio Fireworks Derecho", July 4, 1969.
• "More Trees Down Derecho", July 4-5, 1980.

Edward Vielmetti is tracking this storm for AnnArbor.com.