Severe thunderstorm warning issued

12:55 a.m.

SIOUX FALLS, S.D. - The National Weather Service has issued a severe thunderstorm warning for western Murray County, Pipestone County and northern Rock County, set to expire at 1:30 a.m.

At 12:49 a.m., meteorologists were tracking a severe thunderstorm capable of producing damaging winds in excess of 60 miles per hour, located near Jasper, or 13 miles south of Pipestone, and moving northeast at 40 miles per hour.

The storm will be near Edgerton and Pipestone around 12:55 a.m., Woodstock and Holland around 1:05 a.m., Lake Wilson and Chandler around 1:10 a.m., Ruthton around 1:15 a.m. and Current Lake, Slayton and Florence around 1:20 a.m. Hatfield and Hadley are also expected to be impacted by the storm.

12:40 a.m.

SIOUX FALLS, S.D. - The severe thunderstorm warning for O'Brien County has been canceled.

The line of storms which prompted the warning have weakened below severe limits and no longer pose an immediate threat to life or property in O'Brien County. However, heavy rain is still possible with these thunderstorms. Strong thunderstorms may also redevelop, and a severe thunderstorm watch remains in effect until 4 a.m.

The severe thunderstorm warning is still in effect for other areas, as per the earlier warning shown below.

12:30 a.m.

SIOUX FALLS, S.D. - The National Weather Service has issued a severe thunderstorm warning for north central Lyon county in northwest Iowa, and south central Murray County, Nobles County and Rock County in southwest Minnesota.

At 12:31 a.m., the National Weather Service Meteorologists were tracking a severe thunderstorm capable of producing damaging winds in excess of 60 miles per hour. The strongest part of the storm was located 5 miles south of Luverne and moving northeast at 45 miles per hour.

The severe thunderstorm will be near Ellsworth and Hardwick around 12:40 a.m., Adrian around 12:50 a.m., Lismore and Rushmore around 12:55 a.m., and Wilmont around 1 a.m. Magnolia is also expected to be impacted by the severe thunderstorm.

Severe thunderstorms produce damaging wind in excess of 60 miles per hour, destructive hail, deadly lightning and very heavy rain. The National Weather Service advises people to move to an interior room on the lowest floor of the building. Heavy rains flood roads quickly, so people are advised not to drive into areas where water covers the road.

12:25 a.m.

SIOUX FALLS, S.D. - A flash flood warning has been issued for O'Brien County, Iowa, set to expire at 3:30 a.m. today.

National Weather Service Doppler Radar indicated thunderstorms with very heavy rainfall across the warned area. Rainfall of an inch and a half to two inches has already fallen across much of the area, and more rain will continue to move northeast in the next few hours.

Runoff from this rainfall will cause flash flooding to occur.

Additional rainfall amounts of three quarters to an inch and a quarter are possible, which will greatly exceed the capacity of the already-soggy soil.

Excessive runoff will cause flooding of small creeks and streams, highways and underpasses. Additionally, the National Weather Service stated, country roads and farmland along the banks of creeks, streams and other low-lying areas are subject to flooding.

People are warned to be especially cautious at night, when it is more difficult to recognize the danger of flooding. If flash flooding is observed, people should act quickly, avoid entering the water and try to turn around and move up to higher ground to escape flood waters. The National Weather Service warned people not to stay in areas subject to flooding when waters begin to rise.

12:18 a.m.

SIOUX FALLS, S.D. - A severe thunderstorm warning has also been issued for Lyon County in Iowa, set to expire at 12:45 a.m.

12:15 a.m.

SIOUX FALLS, S.D. - A severe thunderstorm warning has been issued for O'Brien County in Iowa, set to expire at 1 a.m.

According to the National Weather Service, these storms have exhibited some weak rotation. Tornadoes can develop quickly from severe thunderstorms.

Although one is not immediately likely, if a tornado is spotted, act quickly and move to a place of safety inside a sturdy structure, such as a basement or a small interior room.

If you are in the path of these storms, prepare immediately for large hail and damaging winds. People outdoors should move to a shelter, preferably inside a strong building, and should stay away from windows, the National Weather Service warned.

12 a.m.

SIOUX FALLS, S.D. - A tornado warning has been issued for O'Brien County in Iowa, to expire at 12:15 a.m.

10:50 p.m.

SIOUX FALLS, S.D. - The National Weather Service has issued a thunderstorm watch for southwest Minnesota and Northwest Iowa, including Pipestone, Rock, Murray, Nobles, Cottonwood and Jackson counties in Minnesota and Lyon, Osceola, Dickinson and O'Brien counties in Iowa.

The watch will expire at 4 a.m. Wednesday, June 23.