This Day in Weather History: July 31st

Weather History - July 31st

Local and Regional Events:

July 31, 1966:

A deadly, estimated F3 tornado moved southeast, passing south of Ashley, North Dakota, destroying buildings on five farms with near F4 damage to one farm house. Another tornado with F2 strength occurred north of Long Lake where two adults were killed, and three children were injured as a car was thrown 500 feet from Highway 101. A second estimated F2 tornado moved ENE just south of Aberdeen. A trailer was demolished, killing a man and injuring his wife. Seven airplanes were also had damage. Property damage was estimated at a quarter million dollars. An estimated 90 mph wind gust was also reported northeast of Aberdeen.

July 31, 2008:

In the early morning hours of the 31st, a line of storms originating in North Dakota began to expand and surge southeast into northeast South Dakota. As the storms moved southeast, they started to tap into warmer, more humid air and rapidly evolve into a line of severe thunderstorms. Widespread damage occurred in a broad swath extending from Long Lake in McPherson County all the way into eastern Grant County and southern Big Stone County in Minnesota. The most extensive damage was found along and near US Highway 12 from Aberdeen to Milbank. Several observing stations in the path of this system measured wind speeds ranging from 70 mph to over 115 mph. Estimated wind speeds from damage surveys indicated even stronger winds with peak speeds of 120 mph.

Over fifty communities in northeast South Dakota and the surrounding rural areas received minor to major tree, and structural damage as straight-line winds from 70 to 120 mph raced across the area. Webster and Waubay received the most extensive damage from the storms. Thousands of trees were snapped or uprooted, hundreds of grain bins were damaged or destroyed, hundreds of homes, businesses, and outbuildings were damaged or destroyed along with many power poles and miles of power lines downed. Many mobile homes, campers, and boats were damaged or destroyed along with many road and business signs.

Fallen trees also damaged countless homes, vehicles, and campers. Thousands of acres of crops were also damaged or destroyed by the winds and hail. The most significant crop damage occurred in the Roslyn, Grenville, Eden, and Pickerel Lake areas in Marshall and Day counties. Many acres of corn were blown down and not able to come back. The large hail combined with the strong winds also broke out many windows in homes and vehicles along with damaging the siding on houses. Thousands of people were left without power for up to several days. Large hay bales were moved up to 700 yards by the high winds. A semi was overturned on Highway 12 near Webster, injuring the driver. Near Milbank on Highway 12, two other semis were blown off the road resulting in injuries to both drivers. A State Forestry Specialist said it was one of the worst tree damage events he has ever seen in the Webster area. A fifty-eight-year-old man died two miles north of Waubay during the cleanup after the storms when he was pinned between a backhoe and a tree.

U.S.A and Global Events for July 31st:

1715: Spanish treasure ships, returning from the New World to Spain, encountered a hurricane during the early morning hours on this day. Eleven of the twelve ships were lost near present-day Vero Beach, Florida. Click HERE for more information from the History Channel.

1949: Lightning struck a baseball field at Baker, Florida during a game. The shortstop and third baseman were killed instantly.

1987: The second deadliest tornado in Canadian history occurred in Edmonton, Alberta. An F4 tornado killed 27 people, injured over 300, and caused a quarter of a billion dollars in damage. Click HERE for more information.

1997: South Pole, Antarctica recorded their coldest July ever. The average temperature of -86.8 degrees broke the previous record of -83.6 degrees set in July 1965. Click HERE for a live camera from the South Pole Observatory.

Click HERE for more This Day in Weather History from the Southeast Regional Climate Center.