Overview
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Severe thunderstorms developed in Sheridan County, Nebraska during the late evening hours on June 28th, producing hail up to the size of baseballs. As the storm moved northeast into southern South Dakota during the overnight hours, the storm continued to drop hail up to 2.5" in diameter, before producing wind gusts up to 83 mph over Bennett and Todd Counties. As the storm moved through south central South Dakota, it started to show a radar signature for significant severe winds, with the first report of over 100 mph winds occurring at 5:48 AM CDT, 7 miles to the north-northwest of Joe Creek Recreation Area. The storm continued to show strengthening winds on the NWS Aberdeen radar (over 100 mph) as it moved northeast towards Highmore, SD around 6 AM CDT. Two observation sites reported a peak wind gust of 131 mph from the storm: 4 miles ESE of Holabird (6:15 AM CDT - Ambient Weather Station) and 1 mile WNW of Highmore (6:25 AM CDT - SD Mesonet)! This led to significant tree and building damage in Highmore, SD. The storm continued to produce wind gusts of 60-87 mph as it moved northeast across northern Hand and northern Spink counties. The storm then started to exhibit rotation as it moved through southeastern Brown and western Day counties, prompting Tornado Warnings and the storm produced a brief tornado 5.5 miles to the south-southwest of Andover, SD. The storm continued to produce wind damage across northeastern SD, before moving into southeastern ND and northwestern MN around 10 AM CDT. In the end, the storm travelled over 350 miles from southwest to northeast across South Dakota. Based on the current information, the Storm Prediction Center is classifying this storm as a "mini-derecho" because its width did not meet the 100km width criteria. The Storm Prediction Center found that the 131 mph wind gust, should it be officially verified, would likely rank as the 15th strongest thunderstorm wind gust recorded in the United States. The information in this event summary is preliminary and unofficial at this time and will be updated as new information is received. |
 Wind turbine damage (Photo Credit: Jakob McMillin) |
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| NWS Aberdeen Radar Image at 6:14 AM CDT (1114Z) as the storm was reaching Highmore, SD. The radar estimated winds to be over 100 mph at 7000 feet above the ground (dark blue to purple colors on the right half of the image by Highmore, SD). | Building damage in Highmore, SD (Photo Credit: Amanda Brown) |
Outbuilding damage in Highmore, SD (Photo Credit: Jasmine Diehl) |
Tornadoes
Select a tornado from the table to zoom into the track and view more information. The default table view is limited to 8 tracks, but can be scrolled by a mouse wheel or dynamically expanded. Additionally, the table can fill the entire window by clicking the small circular expanding arrow icon at the very top right of the table and returned to its original size by clicking the button again. The side information panel that opens over the map can be closed using the "X" on the upper right corner of the pop-up. Zoom into the map and click damage points to see detailed information and pictures from the surveys.
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NOTE: times shown below are local to your device's time zone. |
The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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| Tornadoes that fail to impact any ratable damage indicators on the EF-Scale are rated EF-Unknown (EF-U) | |||||
Wind Damage Photos
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| Wind turbine knocked over to the southwest of Highmore, SD (Photo Credit: Jakob McMillin) | Multiple wind turbines knocked over (Photo Credit: Jakob McMillin) | Single wind turbine knocked over (Photo Credit: Jakob McMillin) | Collapsed building in Highmore, SD (Photo Credit: Amanda Brown) |
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| Damage to Threshing Ground in East Andover (Photo Credit: Jordan Schmieg) | Tree damage in Highmore, SD (Photo Credit: Amanda Brown) | Damage to the northeast side of a shed, with the west facing wall pushed in (NWS Aberdeen Storm Survey) | Tree damage 6 miles to the south-southwest of Andover, SD. (NWS Aberdeen Storm Survey) |
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| Tree Uprooted in Marshall County (Photo Credit: Marshall County EM) | Partial collapse of a structure in Highmore, SD (Photo Credit: Amanda Brown) |
Damage to the south side of a building from debris blown northeast from a building to the south. (NWS Aberdeen Storm Survey) |
Damage to grain bins (Photo Credit: Jasmine Diehl) |
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| Damage to an Andover Threshing building from debris blown to the northeast from the building to the south. (NWS Storm Survey) | Damage to an Andover Threshing building. (NWS Storm Survey) | Tree damage 6 miles to the south-southwest of Andover, SD. (NWS Aberdeen Storm Survey) |
Radar Loops
Storm Reports
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