This alert expired on 10 May 2026 at 03:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 16 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 9 at 9:40PM CDT until May 9 at 10:00PM CDT by NWS Norman OK
An estimated 781,765 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 11, 2026 · score 41 · 2.2 km
- May 16, 2026 · score 39 · 16.7 km
- June 12, 2026 · score 32 · 23.5 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 48 / 100 |
| Our confidence | 91% |
| Coordinates | 35.4713, -98.0429 |
| Nearest City | El Reno (10 km) |
| Population Exposed | 781.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-10T02:40:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.3860ab750cce3d959e52591b55b7f3a9 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Comanche, OK; Grady, OK; Stephens, OK; Alfalfa, OK; Blaine, OK; Garfield, OK; Grant, OK; Kingfisher, OK; Major, OK; Woods, OK |
| Headline | Severe Thunderstorm Warning issued May 9 at 9:40PM CDT until May 9 at 10:00PM CDT by NWS Norman OK |
| Expires | 2026-05-09T22:00:00-05:00 |
| SenderName | NWS Norman OK |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3860ab750cce3d959e52591b55b7f3a9e1bc464d.002.1","noaa_urn:oid:2.49.0.1.840.0.6a0bb117f6e8dc4406ed711c34eca5eb4a86f874.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 59 |
| Iem Unit | MPH |
| Iem City | 4 WSW Weatherford |
| Iem County | Custer |
| Iem State | OK |
| Iem Wfo | OUN |
| Iem Remark | Weatherford Mesonet. Probable heat burst. |
| MergedSources | [{"id":"iem_G_35.480_-98.480_1778372400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778372400000,"latitude":35.48,"longitude":-98.48},{"id":"iem_G_35.510_-98.780_1778371200000","source":"iem","severity":"low","severityValue":25,"timestamp":1778371200000,"latitude":35.51,"longitude":-98.78},{"id":"iem_G_35.510_-98.780_1778375100000","source":"iem","severity":"low","severityValue":25,"timestamp":1778375100000,"latitude":35.51,"longitude":-98.78},{"id":"iem_G_35.510_-98.780_1778375400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778375400000,"latitude":35.51,"longitude":-98.78}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 48/100, near El Reno (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.