Lyman storm history

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 …

A peak wind gust of 73 mph was recorded at a South Dakota State University mesonet station 12 miles south of Vivian.

A caller stated that winds with the storms gusted to between 50 and 60 mph.

Hail measuring one inch in diameter was reported nine miles southwest of Oacoma.

Hail measuring 1.25 inches in diameter was reported in the town of Kennebec.

A trained spotter witnessed a funnel cloud just south of Interstate 90.

A trained spotter reported water flowing over the roads in West Brule.

A member of the public reported that multiple trees were downed in the area and an outbuilding was shifted by the winds.

The caller stated that high winds had tipped trees over and blown them onto the house.

The public observed that wind-driven hail stripped siding from a house. In addition, barn doors were blown off and cattle were forced through a fence and out onto the road.

A measured wind gust of 72 mph was recorded at the South Dakota State University mesonet weather station near Oacoma.

A peak gust of 72 mph was measured on the South Dakota Department of Transportation RWIS 9 miles north-northwest of Vivian.

A trained spotter estimated the winds at 75 mph.

A peak wind gust of 80 mph was observed by the South Dakota State University mesonet station near Lower Brule. West Central Electric Cooperative reported multiple power outages due to broken poles and wires in and around Lower Brule.

A peak non-thunderstorm wind gust of 67 mph was observed by the South Dakota State University mesonet station 12 miles south of Vivian.

A trained spotter reported hen egg to tennis ball-sized hail near Lyman. The time was estimated based on radar.

The caller stated that they estimated the wind speed at 60 mph.

Strong wind gusts were associated with a decaying thunderstorm heat burst.