Severe Thunderstorm Warning — Harper, OK was recorded by Global Incident Tracker on Saturday, 12 September 2026 at 22:06 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 12 at 5:06PM CDT until September 12 at 5:45PM CDT by NWS Norman OK SVROUN The National Weather Service in Norman has issued a * Severe Thunderstorm Warning for... Southern Harper County in northwestern Oklahoma... * Until 545 PM CDT. * At 505 PM CDT, a severe thunderstorm was located 7 miles southwest of Selman, moving east at 10 mph. Other severe thunderstorms were located 3 miles east of May and 5 miles south of Laverne. HAZARD...60 mph wind gusts and half dollar size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * Locations impacted include... Laverne, May, and Selman.

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 36.713°, -99.611°. 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, 22:06 UTC
    First report Official warning

    First recorded from U.S. National Weather Service.

    U.S. National Weather Service ↗

  2. · received · event time 12 Sep 2026, 22:37 UTC
    Also reported Official warning

    Also reported by U.S. National Weather Service: "Severe Thunderstorm Warning — Harper, OK"

    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

1.4mm
Rainfall that day
38°C
Maximum temperature
22°C
Minimum temperature
32km/h
Peak wind speed

Light rain of 1.4 mm was recorded, and the temperature peaked at 38°C, and winds reached 32 km/h. Conditions are shown for context only — they do not establish a cause.

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