Severe Thunderstorm Warning — Big Stone, MN; Grant, SD; Roberts, SD was recorded by Global Incident Tracker on Saturday, 12 September 2026 at 00:19 UTC. The event is classified as a storm incident with a severity rating of Severe, and was detected through the US National Weather Service (NWS).

Severe Thunderstorm Warning issued September 11 at 7:19PM CDT until September 11 at 8:00PM CDT by NWS Aberdeen SD SVRABR The National Weather Service in Aberdeen has issued a * Severe Thunderstorm Warning for... Central Big Stone County in west central Minnesota... Northeastern Grant County in northeastern South Dakota... Southeastern Roberts County in northeastern South Dakota... * Until 800 PM CDT. * At 719 PM CDT, a severe thunderstorm was located near Corona, or 9 miles southeast of Wilmot, moving east at 25 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * This severe thunderstorm will be near... Marvin around 720 PM CDT. Corona around 725 PM CDT. Lismore Colony around 750 PM CDT.

Where this happened

The incident is located in United States (North America), whose capital is Washington, D.C.. Historically, United States is most affected by hurricanes, wildfires, tornadoes, earthquakes and floods. You can follow every incident recorded in this country, updated live, on the United States incident tracker.

Approximate coordinates of the reported event are 45.327°, -96.770°. The marker on the map above shows this position; for news-derived reports the location reflects the place named in media coverage and may represent a district or city rather than an exact site.

Understanding storm events

Severe thunderstorms, windstorms, hail and winter storms. Severe storms combine wind, lightning, hail and sudden downpours. Secondary effects — falling trees, power line damage and flash flooding on roads — cause the majority of injuries.

How severity is rated

Global Incident Tracker rates every event on a four-step scale — Minor, Moderate, Severe and Extreme — derived from the source signal: earthquake magnitude, official GDACS alert colour, or the volume of independent media reporting for news-derived incidents. This event is currently rated Severe. Ratings can change as more information becomes available, and a rating is a monitoring signal rather than an official government assessment.

Safety guidance for storm situations

  • Move indoors and away from windows; avoid sheltering under trees.
  • Unplug sensitive electronics and avoid using wired equipment during lightning.
  • Assume every downed power line is live and keep well clear.
  • Do not drive through flooded underpasses.
  • Follow only official instructions from local authorities and emergency services — this page is a monitoring record, not an emergency alert.

Data and verification

This record was generated automatically from the US National Weather Service (NWS) and de-duplicated against our archive. Early reports for any incident can be revised: locations get refined, magnitudes are recalculated and impact figures change as assessments arrive. We deliberately do not publish casualty numbers unless an official source states them. The original source report is linked at the top of this page.

Keep watching the situation on our live world incident map, browse every storms we track on the Storm tracker, or see today's global picture on the incidents today page.

Timeline and sources

Official warning

Issued by U.S. National Weather Service. A warning or forecast describes a hazard; on its own it is not a report that harm occurred.

How statuses are decided · the number of reports is never treated as confirmation.

  1. · received · event time 12 Sep 2026, 00:19 UTC
    First report Official warning

    First recorded from U.S. National Weather Service.

    U.S. National Weather Service ↗

  2. · received
    Also reported Official warning

    One more report from U.S. National Weather Service. Links were not kept for reports merged before 13 September 2026.

    U.S. National Weather Service

Times are when this site received each report, in UTC; the event time is shown where the source gave one. 2 reports are attached to this incident. Copies of one syndicated story count as one report.

Conditions at the time

0mm
Rainfall that day
29°C
Maximum temperature
13°C
Minimum temperature
33km/h
Peak wind speed

No rainfall was recorded that day, and the temperature peaked at 29°C, and winds reached 33 km/h. Conditions are shown for context only — they do not establish a cause.

Weather reanalysis for this location and date via Open-Meteo.