Several supercell thunderstorms moving southeast across the region brought very large hail up to softball size along with damaging winds to parts of northeast South Dakota. Numerous homes, vehicles, along with thousands of acres of crops were damaged.

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 15:03:00 to 17-JUL-10 15:03:00 (CST-6)
Location: BATH
Magnitude: 1.75 
Reported by: Emergency Manager

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 15:20:00 to 17-JUL-10 15:20:00 (CST-6)
Location: PUTNEY
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 15:34:00 to 17-JUL-10 15:34:00 (CST-6)
Location: GROTON
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 15:00:00 to 17-JUL-10 15:00:00 (CST-6)
Location: COLUMBIA
Magnitude: 1.75 
Reported by: COOP Observer

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:15:00 to 17-JUL-10 16:15:00 (CST-6)
Location: CROCKER
Magnitude: 1.75 
Reported by: Emergency Manager

Hail in DAY, SOUTH DAKOTA
From 17-JUL-10 16:00:00 to 17-JUL-10 16:00:00 (CST-6)
Location: BUTLER
Magnitude: 1.00 
Reported by: Public

Hail in CODINGTON, SOUTH DAKOTA
From 17-JUL-10 16:45:00 to 17-JUL-10 16:45:00 (CST-6)
Location: HENRY
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:56:00 to 17-JUL-10 16:56:00 (CST-6)
Location: NAPLES
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 17:01:00 to 17-JUL-10 17:01:00 (CST-6)
Location: NAPLES
Magnitude: 1.75 
Reported by: Emergency Manager

Hail in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 17:05:00 to 17-JUL-10 17:05:00 (CST-6)
Location: HAZEL
Magnitude: 1.75 
Reported by: Emergency Manager

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 17:25:00 to 17-JUL-10 17:25:00 (CST-6)
Location: HAYTI
Magnitude: 70.00 EG
Reported by: Emergency Manager

Several large trees were downed in Hayti by eighty mph winds.

Hail in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 17:30:00 to 17-JUL-10 17:30:00 (CST-6)
Location: STONE BRIDGE
Magnitude: 1.00 
Reported by: Emergency Manager

Hail in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 17:34:00 to 17-JUL-10 17:34:00 (CST-6)
Location: LAKE NORDEN
Magnitude: 1.00 
Reported by: Emergency Manager

Hail in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 17:38:00 to 17-JUL-10 17:38:00 (CST-6)
Location: STONE BRIDGE
Magnitude: 1.50 
Reported by: Emergency Manager

Hail in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 18:04:00 to 17-JUL-10 18:04:00 (CST-6)
Location: ESTELLINE MUNI ARPT
Magnitude: 1.00 
Reported by: Emergency Manager

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:30:00 to 17-JUL-10 16:30:00 (CST-6)
Location: ELROD
Magnitude: 61.00 EG
Reported by: Trained Spotter

Seventy mph winds combined with large hail uprooted several evergreen trees, broke windows on the house and cars.

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 17-JUL-10 16:00:00 to 17-JUL-10 16:00:00 (CST-6)
Location: LAKE CITY
Magnitude: 65.00 EG
Reported by: COOP Observer

Several trees and many large branches were downed by the high winds.

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:42:00 to 17-JUL-10 14:42:00 (CST-6)
Location: BARNARD
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:45:00 to 17-JUL-10 14:45:00 (CST-6)
Location: BARNARD
Magnitude: 1.00 
Reported by: Emergency Manager

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:46:00 to 17-JUL-10 14:46:00 (CST-6)
Location: WESTPORT
Magnitude: 4.25 
Reported by: Emergency Manager

Hail up to the size of softballs occurred near Westport.

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:53:00 to 17-JUL-10 14:53:00 (CST-6)
Location: ABERDEEN
Magnitude: 1.75 
Reported by: NWS Employee

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:54:00 to 17-JUL-10 14:54:00 (CST-6)
Location: ABERDEEN
Magnitude: 1.00 
Reported by: Public

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:20:00 to 17-JUL-10 16:20:00 (CST-6)
Location: CROCKER
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:34:00 to 17-JUL-10 16:34:00 (CST-6)
Location: CLARK
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:37:00 to 17-JUL-10 16:37:00 (CST-6)
Location: GARDEN CITY
Magnitude: 1.50 
Reported by: Law Enforcement

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:30:00 to 17-JUL-10 16:30:00 (CST-6)
Location: CLARK
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:38:00 to 17-JUL-10 16:38:00 (CST-6)
Location: ELROD
Magnitude: 2.50 
Reported by: NWS Storm Survey

Large hail up to the size of tennis balls busted out numerous windows, caused severe siding damage, and wiped out hundreds of acres of wheat and corn.

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 17-JUL-10 15:25:00 to 17-JUL-10 15:25:00 (CST-6)
Location: LAKE CITY
Magnitude: 52.00 EG
Reported by: Trained Spotter

Sixty mph winds blew a small trailer over which damaged some siding and fencing.

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:30:00 to 17-JUL-10 16:30:00 (CST-6)
Location: BRADLEY
Magnitude: 56.00 EG
Reported by: Emergency Manager

Sixty-five mph winds were estimated north of Garden City.

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-10 15:30:00 to 17-JUL-10 15:30:00 (CST-6)
Location: SISSETON
Magnitude: 66.00 MG
Reported by: ASOS

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:55:00 to 17-JUL-10 14:55:00 (CST-6)
Location: ABERDEEN
Magnitude: 1.00 
Reported by: NWS Employee

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:56:00 to 17-JUL-10 14:56:00 (CST-6)
Location: ABERDEEN
Magnitude: 1.00 
Reported by: NWS Employee

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:55:00 to 17-JUL-10 14:55:00 (CST-6)
Location: ABERDEEN
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 16:35:00 to 17-JUL-10 16:35:00 (CST-6)
Location: CLARK
Magnitude: 2.75 
Reported by: Law Enforcement

Baseball hail took out hundreds of windows in homes and on vehicles throughout Clark along with damaging siding on residences and denting vehicles. Trees and gardens also suffered extensive damage from the hail and wind.

Hail in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 16:58:00 to 17-JUL-10 17:56:00 (CST-6)
Location: HAZEL
Magnitude: 2.75 
Reported by: Newspaper

A supercell thunderstorm entered western Hamlin county and tracked southeast producing quarter to baseball size hail along with damaging winds in excess of 70 mph. The large hail and strong winds caused extensive damage to homes, outbuildings, vehicles, and especially crops.  Thousands of acres of corn, soybeans, and wheat were damaged or destroyed across Hamlin county. Also, many trees and gardens were damaged by the hail and high winds.

Hail in CLARK, SOUTH DAKOTA
From 17-JUL-10 15:51:00 to 17-JUL-10 17:12:00 (CST-6)
Location: CROCKER
Magnitude: 2.75 
Reported by: Newspaper

A supercell thunderstorm tracking southeast across Clark county produced anywhere from quarter to baseball size hail along with wind gusts over 70 mph from Crocker to Clark to Naples to Vienna.  The large hail and winds caused extensive damage to homes, outbuildings, vehicles, and thousands of acres of crops.  Many trees and gardens were also damaged or destroyed by the hail and high winds. The storm entered western Hamlin county.

Thunderstorm Wind in CODINGTON, SOUTH DAKOTA
From 17-JUL-10 17:00:00 to 17-JUL-10 17:00:00 (CST-6)
Location: HENRY
Magnitude: 61.00 EG
Reported by: Trained Spotter

Many large tree branches were downed in Henry along with some power lines.

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 17:24:00 to 17-JUL-10 17:24:00 (CST-6)
Location: HAYTI
Magnitude: 81.00 MG
Reported by: Emergency Manager

Winds measured over 90 mph in Hayti along with some large hail broke numerous windows out of several homes and vehicles, damaged several roofs, and downed many trees.  A concrete silo was also destroyed. The highway shop lost half of it's roof along with severe damage to the roof of a trucking business in Hayti.

Hail in BROWN, SOUTH DAKOTA
From 17-JUL-10 14:58:00 to 17-JUL-10 14:58:00 (CST-6)
Location: ABERDEEN
Magnitude: 2.75 
Reported by: Official NWS Observations

Golfball to baseball size hail fell at the National Weather Service office causing damage to several vehicles. The rear window was broken out of one of the vehicles.

Hail in HAMLIN, SOUTH DAKOTA
From 17-JUL-10 17:57:00 to 17-JUL-10 17:57:00 (CST-6)
Location: DEMPSTER
Magnitude: 1.00 
Reported by: Emergency Manager