This alert expired on 18 June 2026 at 23:32 UTC. It is kept here as a record.
It is the 3rd strongest of the 41 detections recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 18 at 6:22PM CDT until June 18 at 6:30PM CDT by NWS Tulsa OK
An estimated 111,275 people live within 50 km of this point.
Nearby, since 4 April 2026
- August 7, 2026 · score 43 · 2.4 km
- August 7, 2026 · score 37 · 8.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 84 % 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) | 43 / 100 |
| Our confidence | 84% |
| Coordinates | 35.3067, -94.2417 |
| Nearest City | Fort Smith (17 km) |
| Population Exposed | 111.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T23:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.42ef0dee33d6c3d8a2eb4d73170783c583d965f9.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Crawford, AR; Sebastian, AR |
| Headline | Severe Thunderstorm Warning issued June 18 at 6:22PM CDT until June 18 at 6:30PM CDT by NWS Tulsa OK |
| Expires | 2026-06-18T18:32:00-05:00 |
| SenderName | NWS Tulsa OK |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 1 E Fort Smith |
| Iem County | Sebastian |
| Iem State | AR |
| Iem Wfo | TSA |
| Iem Remark | downed tree at intersection of Waldron and Grand Ave; time estimated by radar. |
| MergedSources | [{"id":"iem_D_35.390_-94.370_1781822880000","source":"iem","severity":"low","severityValue":25,"timestamp":1781822880000,"latitude":35.39,"longitude":-94.37}] |
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 43/100, near Fort Smith (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.