Right now
The most recent data we hold from NOAA arrived 8 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
10 other detections within 20 km in the last 24 hours, the nearest 3 km from here.
This alert expired on 8 September 2026 at 01:15 UTC. It is kept here as a record.
No stronger detection stands among the 324 recorded within 20 km of this point since 17 May 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Tornado Warning issued September 7 at 7:51PM CDT until September 7 at 8:15PM CDT by NWS Sioux Falls SD
Nearby, since 17 May 2026
- September 1, 2026 · score 28 · 10.3 km
- September 7, 2026 · score 28 · 12.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 65 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Critical |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 65% |
| Coordinates | 42.9641, -98.5099 |
| Nearest City | Mitchell (92 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-08T00:51:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.1a97c909dce9b0f2f9f6578b2c726b96a8507cbf.002.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Charles Mix, SD; Boyd, NE |
| Headline | Tornado Warning issued September 7 at 7:51PM CDT until September 7 at 8:15PM CDT by NWS Sioux Falls SD |
| Expires | 2026-09-07T20:15:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1a97c909dce9b0f2f9f6578b2c726b96a8507cbf.002.1","noaa_urn:oid:2.49.0.1.840.0.69ed13f8e65953c78aeadff19e0f9aeb47820f0a.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 125 |
| Spc Location | 2 N Lake Andes |
| Spc County | Charles Mix |
| Spc State | SD |
| Spc Comments | (FSD) |
| MergedSources | [{"id":"spc_tornado_42.90_-98.63_1","source":"spc","severity":"high","severityValue":78,"timestamp":1788827700000,"latitude":42.9,"longitude":-98.63},{"id":"spc_wind_42.93_-98.97_11","source":"spc","severity":"medium","severityValue":45,"timestamp":1788828687907,"latitude":42.93,"longitude":-98.97},{"id":"spc_wind_42.93_-98.97_12","source":"spc","severity":"medium","severityValue":45,"timestamp":1788828687907,"latitude":42.93,"longitude":-98.97},{"id":"spc_wind_42.92_-98.82_15","source":"spc","severity":"medium","severityValue":45,"timestamp":1788828687907,"latitude":42.92,"longitude":-98.82},{"id":"spc_wind_42.93_-98.63_16","source":"spc","severity":"medium","severityValue":45,"timestamp":1788825600000,"latitude":42.93,"longitude":-98.63},{"id":"spc_hail_42.87_-98.95_18","source":"spc","severity":"high","severityValue":65,"timestamp":1788828687907,"latitude":42.87,"longitude":-98.95},{"id":"spc_hail_43.19_-98.54_19","source":"spc","severity":"high","severityValue":65,"timestamp":1788828687907,"latitude":43.19,"longitude":-98.54}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 in this area?
Calamity.live data shows a weather event with CalamityScore 46/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.