Flash Flood in Lyman County, South Dakota

Flash Flood June 20, 2011 – June 21, 2011 · Lyman County, South Dakota

Deaths

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Very heavy rainfall of 5 to 7 inches brought flash flooding to mainly eastern Lyman county. Many roads were flooded with some washed out. Two women died in two separate vehicles after driving into a washed out portion of a road. One woman was found 100 yards downstream while the other woman was found 4 miles downstream. The accidents were believed to happen between 930 and 10 am. The location was 9 miles north of Reliance on BIA 10 just north of the intersection with Highway 47.

The wider storm

A large upper level low pressure area along with deep moisture brought very heavy rains to central South Dakota. Rainfall amounts of 3 to 7 inches occurred across parts of the area resulting in flash flooding.

Began near Lower Brule (44.0437, -99.4970).

Source: NOAA Storm Events Database, event 326376. Narratives are written by the National Weather Service forecast office that issued the report.

Tornadoes near your address

See every tornado that passed near a place you know, measured to its path.