A surface low pressure area moving east along with a strong warm front surging north brought numerous severe thunderstorms to north central and northeast South Dakota. Damaging winds, large hail, flash flooding, along with a few tornadoes all occurred with this system.

Flash Flood in MARSHALL, SOUTH DAKOTA
From 26-JUL-11 20:30:00 to 26-JUL-11 23:30:00 (CST-6)
Location: MARLOW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy rain flooded several roads and washed out a culvert.

Hail in SULLY, SOUTH DAKOTA
From 26-JUL-11 16:40:00 to 26-JUL-11 16:40:00 (CST-6)
Location: LAUREL
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HUGHES, SOUTH DAKOTA
From 26-JUL-11 17:32:00 to 26-JUL-11 17:32:00 (CST-6)
Location: HARROLD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in WALWORTH, SOUTH DAKOTA
From 26-JUL-11 18:05:00 to 26-JUL-11 18:07:00 (CST-6)
Location: LOWRY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tornado touched down briefly northeast of Hoven in an open field with no damage occurring.

Tornado in POTTER, SOUTH DAKOTA
From 26-JUL-11 18:15:00 to 26-JUL-11 18:16:00 (CST-6)
Location: HOVEN
Tornado F-scale: EF0
Crop damage: 0.00K
Reported by: Broadcast Media

A tornado touched down briefly in Hoven heavily damaging the roof of a business along with downing several trees.

Tornado in MARSHALL, SOUTH DAKOTA
From 26-JUL-11 19:40:00 to 26-JUL-11 19:50:00 (CST-6)
Location: SPAIN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched downed about seven miles southeast of Britton. The tornado downed many trees as it tracked east northeast for about a mile.

Thunderstorm Wind in EDMUNDS, SOUTH DAKOTA
From 26-JUL-11 19:05:00 to 26-JUL-11 19:05:00 (CST-6)
Location: MINA
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Eighty mph winds uprooted several large trees and downed many large tree branches.

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 26-JUL-11 19:45:00 to 26-JUL-11 19:45:00 (CST-6)
Location: LAKE CITY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was downed by seventy mph winds.

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 26-JUL-11 19:45:00 to 26-JUL-11 19:45:00 (CST-6)
Location: MARLOW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds downed several large tree limbs.

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 26-JUL-11 20:00:00 to 26-JUL-11 20:00:00 (CST-6)
Location: BRITTON MUNI ARPT
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Public

Eighty mph winds downed four large evergreens along with downing many large tree branches. Also, a shed was destroyed with another one damaged.

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 26-JUL-11 20:15:00 to 26-JUL-11 20:15:00 (CST-6)
Location: ROSLYN
Magnitude: 70.00 EG
Reported by: NWS Storm Survey

Many trees were downed along with many branches in and around Roslyn. Several cars and homes received damage from the fallen trees and branches. The grain elevator was leaning over some in town. A semi truck was also tipped over.

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 26-JUL-11 17:40:00 to 26-JUL-11 17:40:00 (CST-6)
Location: HARROLD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Sixty mph winds were estimated in Harrold.

Thunderstorm Wind in POTTER, SOUTH DAKOTA
From 26-JUL-11 18:06:00 to 26-JUL-11 18:06:00 (CST-6)
Location: HOVEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated west of Hoven.

Thunderstorm Wind in EDMUNDS, SOUTH DAKOTA
From 26-JUL-11 19:11:00 to 26-JUL-11 19:11:00 (CST-6)
Location: MINA
Magnitude: 52.00 EG
Reported by: Emergency Manager

Sixty mph winds blew over several highway signs.

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 26-JUL-11 20:15:00 to 26-JUL-11 20:15:00 (CST-6)
Location: HILLHEAD
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 26-JUL-11 20:25:00 to 26-JUL-11 20:25:00 (CST-6)
Location: PEEVER
Magnitude: 61.00 EG
Reported by: Public

Several trees were downed by seventy mph winds in Peever.

Thunderstorm Wind in HAND, SOUTH DAKOTA
From 26-JUL-11 18:30:00 to 26-JUL-11 18:30:00 (CST-6)
Location: REE HGTS
Magnitude: 61.00 EG
Reported by: Trained Spotter

A few large trees were blown over by seventy mph winds.

Thunderstorm Wind in HYDE, SOUTH DAKOTA
From 26-JUL-11 18:10:00 to 26-JUL-11 18:10:00 (CST-6)
Location: HIGHMORE
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Many large tree branches were downed in Highmore.

Thunderstorm Wind in EDMUNDS, SOUTH DAKOTA
From 26-JUL-11 19:10:00 to 26-JUL-11 19:10:00 (CST-6)
Location: MINA
Magnitude: 65.00 EG
Reported by: NWS Storm Survey

An estimated 20 to 30 trees were downed by seventy plus mph winds at Mina Lake. An airplane was also damaged by the strong winds.

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 26-JUL-11 20:00:00 to 26-JUL-11 20:00:00 (CST-6)
Location: SPAIN
Magnitude: 70.00 EG
Reported by: Public

Eighty mph winds downed several trees, moved many hay bales, and damaged the shingles on the home.

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 26-JUL-11 20:30:00 to 26-JUL-11 20:30:00 (CST-6)
Location: PIERPONT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Many large tree branches were downed.

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 26-JUL-11 20:40:00 to 26-JUL-11 20:40:00 (CST-6)
Location: PEEVER
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Many trees were downed southwest of Peever.

Flash Flood in ROBERTS, SOUTH DAKOTA
From 27-JUL-11 08:00:00 to 27-JUL-11 20:00:00 (CST-6)
Location: NEW EFFINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An estimated 5 to 7 inches of rain fell during the late evening hours of July 26th in northern Roberts county.  This water then moved overland and out of the hills and began to pool in the northern part of New Effington during the morning hours of July 27th. At one time the water was rising at one foot an hour. Several homes were flooded along with many roads in and outside of town.

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 26-JUL-11 19:30:00 to 26-JUL-11 19:30:00 (CST-6)
Location: BRITTON
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: NWS Storm Survey

Seventy mph winds downed several trees in Britton.  The grain elevator was also damaged in Britton.

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 26-JUL-11 20:47:00 to 26-JUL-11 20:47:00 (CST-6)
Location: SISSETON
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Sixty mph winds damaged some signs and downed many tree branches in Sisseton.

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 26-JUL-11 20:30:00 to 26-JUL-11 20:30:00 (CST-6)
Location: GRENVILLE
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Eighty mph winds downed several trees.