Part of Monday night’s severe weather classified as a derecho

MIAMI VALLEY — Severe storms rocked the Miami Valley Monday. The first widespread bowing segment of severe storms produced lots of wind damage, power outages, hail, prolific lightning and flooding rain.

Just as the first round was exiting, a second round of severe weather came through the northern Miami Valley causing more power outages and damage, especially to counties northeast of Dayton. This complex of storms was officially classified as a derecho by the Storm Prediction Center after analyzing the storm reports and radar. You likely know the term because we had a derecho come through in 2012.

What is a derecho? This is the specific criteria that must be met to be called one:

  • A widespread, long-lived wind storm
  • Swath of wind damage must extend at least 400 miles and be at least 60 miles wide
  • Most of the line should produce 58 mph wind gusts or higher
  • There also should be several significant gusts of 75mph or greater

The National Weather Service Office of Northern Indiana shared that the Fort Wayne airport saw a wind gust of 98 mph, which is the strongest on record! The old record was from the 2012 derecho that also impacted the Miami Valley.

If you follow the radar, that mesoscale convective system developed in the Dakotas and rode the ridge of high pressure through Indiana, Ohio, West Virginia, eastern Kentucky, and even lived on to impact the Florida panhandle Tuesday night.