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Areas of Excessive Rainfall; Refreshingly Cool Air Remains over Much of the Central and Eastern U.S.

Heavy thunderstorms may bring excessive rainfall and possible flooding over parts of the northern Gulf Coast Friday and over parts of Texas and New Mexico Friday through the weekend. A refreshingly cool and dry air mass will continue to produce below average temperatures over much of the central and eastern U.S. into this weekend. Read More >

Overview

On June 29, 2019 a surface boundary was located across south central South Dakota. Very strong instability along the boundary was realized when a thunderstorm exploded along it. The thunderstorm updraft stretched energy along the boundary into a very slow moving tornado near Allen, SD.

The tornado was visible for many miles. It was unusual because it only moved within a two mile area, but lasted about 40 minutes. Fortunately, it spun over corn fields most of the time. It damaged a house, blew over a couple of grain bins, snapped power poles, and carried grain bags. The tornado was rated EF-1 by an NWS storm survey team.

More information about the environment of the Allen tornado can be found here

Tornado near Allen, SD
Courtesy Chris O.
Tornado near Allen, SD Tornado near Allen, SD Tornado near Allen, SD
Courtesy Gail S. Courtesy Josie D. Courtesy Ang G.
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