Heavy Rain in Wayne County, Iowa
Heavy Rain July 14, 2021 – July 15, 2021 · Wayne County, Iowa
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Report of 2.22 inches of rain in 2 hours.
The wider storm
A surface low pressure system was centered over Kansas and Nebraska with attendant warm front draped across north central Iowa. This was bisected by an outflow boundary from morning convection across western Iowa. As morning activity exited the are the atmosphere quickly recovered steep low and mid level lapse rates exceeded 8 C/km with 0-6 km shear over 40 knots. Near the remnant outflow boundary 0-1 km SRH exceeded 150 m2/s2. Storms developed along this boundary and moved east along the warm front, spawning a number of tornadoes across the state. In fact, this is in the top 5 for tornadoes occurring in a single day for the state of Iowa since reliable records began in the 1980s. By evening convection congealed into an MCS, bringing heavy rain to portions of the state. A line of training storms set up north of the Des Moines metro, resulting in localized flash flooding.
Began near Humeston (40.8600, -93.5000).
Other tornadoes from the same storm system
11 more tornadoes the National Weather Service filed under this storm episode.
Source: NOAA Storm Events Database, event 971428. Narratives are written by the National Weather Service forecast office that issued the report.
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