This alert expired on 12 August 2026 at 23:30 UTC. It is kept here as a record.
No stronger detection stands among the 5 recorded within 20 km of this point since 15 March 2026 — 3 others scored the same. The last comparable one was on 31 July 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 6:02PM CDT until August 12 at 6:30PM CDT by NWS Springfield MO
An estimated 35,080 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 31, 2026 · score 34 · 7.2 km
- August 12, 2026 · score 34 · 12.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 77 % 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) | 34 / 100 |
| Our confidence | 77% |
| Coordinates | 37.6776, -91.7981 |
| Nearest City | Rolla (30 km) |
| Population Exposed | 35.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T23:02:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.896f04dbe92b6d2c3ffeb7518b77102d |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dent, MO; Phelps, MO; Crawford, MO; Jefferson, MO; Washington, MO; Christian, MO; Greene, MO; Webster, MO |
| Headline | Severe Thunderstorm Warning issued August 12 at 6:02PM CDT until August 12 at 6:30PM CDT by NWS Springfield MO |
| Expires | 2026-08-12T18:30:00-05:00 |
| SenderName | NWS Springfield MO |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.896f04dbe92b6d2c3ffeb7518b77102d5dbb1c2d.001.1","noaa_urn:oid:2.49.0.1.840.0.fa77d3903bd48dd149f343a370a67d026f340c9a.001.1","noaa_urn:oid:2.49.0.1.840.0.1b9186e0a7a72ad5e4d702b9c2a256f0cab5ce18.001.1"] |
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 34/100, near Rolla (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.