This alert expired on 4 July 2026 at 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 14 recorded within 20 km of this point since 15 March 2026 — one other scored the same. The last comparable one was on 4 April 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 4 at 6:06PM CDT until July 4 at 6:45PM CDT by NWS Aberdeen SD
An estimated 102,268 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 4, 2026 · score 43 · 17.0 km
How we know
Confirmed by 7 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 | 45.3817, -94.6831 |
| Nearest City | Willmar (40 km) |
| Population Exposed | 102.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T23:06:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.56f2fe65b6fae42aaaeed21fd22c0092 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Big Stone, MN; Grant, SD; Roberts, SD; Kandiyohi, MN; Meeker, MN; Pine, MN |
| Headline | Severe Thunderstorm Warning issued July 4 at 6:06PM CDT until July 4 at 6:45PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-04T18:45:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.56f2fe65b6fae42aaaeed21fd22c0092e03af96f.001.1","noaa_urn:oid:2.49.0.1.840.0.1baccc6709ada8900338a16842747db5ff6937aa.001.1","noaa_urn:oid:2.49.0.1.840.0.7e7bd6c5a21a355c71b6afa71e6dd42ae0700fc7.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 2 N Long Prairie |
| Iem County | Todd |
| Iem State | MN |
| Iem Wfo | MPX |
| MergedSources | [{"id":"iem_H_45.630_-94.750_1783200840000","source":"iem","severity":"low","severityValue":25,"timestamp":1783200840000,"latitude":45.63,"longitude":-94.75},{"id":"iem_H_45.810_-94.960_1783197000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783197000000,"latitude":45.81,"longitude":-94.96},{"id":"iem_H_45.620_-94.740_1783201440000","source":"iem","severity":"low","severityValue":25,"timestamp":1783201440000,"latitude":45.62,"longitude":-94.74},{"id":"iem_D_45.950_-95.000_1783197480000","source":"iem","severity":"low","severityValue":25,"timestamp":1783197480000,"latitude":45.95,"longitude":-95},{"id":"iem_H_45.740_-94.960_1783198620000","source":"iem","severity":"low","severityValue":25,"timestamp":1783198620000,"latitude":45.74,"longitude":-94.96},{"id":"iem_H_46.010_-94.870_1783197300000","source":"iem","severity":"low","severityValue":25,"timestamp":1783197300000,"latitude":46.01,"longitude":-94.87}] |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.