This alert expired on 3 July 2026 at 01:30 UTC. It is kept here as a record.
No stronger detection stands among the 39 recorded within 20 km of this point since 15 March 2026 — 8 others scored the same. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 2 at 8:20PM CDT until July 2 at 8:30PM CDT by NWS Sioux Falls SD
An estimated 171,544 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 1, 2026 · score 43 · 4.0 km
- June 18, 2026 · score 43 · 14.4 km
- May 25, 2026 · score 43 · 23.7 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 88 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 88% |
| Coordinates | 43.6838, -96.5275 |
| Nearest City | Sioux Falls (23 km) |
| Population Exposed | 171.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T01:20:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.94f1b8a44bf2b297244ea7bf9469a6181968a68b.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lyon, IA; Lincoln, SD; Minnehaha, SD; Moody, SD |
| Headline | Severe Thunderstorm Warning issued July 2 at 8:20PM CDT until July 2 at 8:30PM CDT by NWS Sioux Falls SD |
| Expires | 2026-07-02T20:30:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 65 |
| Iem Unit | MPH |
| Iem City | 5 ENE Orland |
| Iem County | Lake |
| Iem State | SD |
| Iem Wfo | FSD |
| Iem Remark | Mesonet station MDMS2 Madison 6S (SD Mesonet). |
| MergedSources | [{"id":"iem_G_43.940_-96.970_1783035600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783035600000,"latitude":43.94,"longitude":-96.97},{"id":"iem_G_43.560_-97.160_1783038600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783038600000,"latitude":43.56,"longitude":-97.16},{"id":"iem_H_44.170_-96.380_1783038060000","source":"iem","severity":"low","severityValue":25,"timestamp":1783038060000,"latitude":44.17,"longitude":-96.38},{"id":"iem_G_43.910_-97.090_1783035780000","source":"iem","severity":"low","severityValue":25,"timestamp":1783035780000,"latitude":43.91,"longitude":-97.09}] |
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 8 March 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.
Want to know when something happens near Sioux Falls?
Calamity.live data shows a weather event with CalamityScore 43/100, near Sioux Falls (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.