Thunderstorm Wind in Mills County, Iowa

Trained spotter report of downed 4 inch in diameter tree branches. Wind gusts were estimated near 60-65 mph.

On the evening of July 9th into the early morning hours of July 10th, a large thunderstorm complex tracked south across much of eastern Nebraska and western Iowa. The event began with a few discrete thunderstorms across central Nebraska that quickly congealed into a mesoscale convective system (MCS) pushing into the region. The environment was primed with 2,000'3,000 J/kg of MLCAPE and modest bulk shear, providing ample fuel for storm development.

While no severe reports were noted in northeast Nebraska, the MCS produced stronger impacts farther south overnight. A personal weather station measured a 61 mph wind gust about 3 miles east-southeast of Pacific Junction, Iowa, and a trained spotter reported 4-inch tree limbs down in Malvern, Iowa. In the system's wake, a mesoscale pressure feature known as a wake low developed over southeast Nebraska, where the KLNK ASOS recorded a 63 mph gust.

The storms gradually weakened through the early morning as they moved deeper into Kansas and farther east into Iowa.