Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 1 June 2026 at 05:30 UTC. It is kept here as a record.
It is the 4th strongest of the 27 detections recorded within 20 km of this point since 15 April 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 1 at 12:03AM CDT until June 1 at 12:30AM CDT by NWS Sioux Falls SD
Nearby, since 15 April 2026
- May 16, 2026 · score 22 · 17.8 km
- June 1, 2026 · score 22 · 22.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 59 % 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) | 22 / 100 |
| Our confidence | 59% |
| Coordinates | 41.9450, -95.7161 |
| Nearest City | Council Bluffs (77 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-01T05:03:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.798304e17c1c66e865b55c71963d3392 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Woodbury, IA; Harrison, IA; Shelby, IA |
| Headline | Severe Thunderstorm Warning issued June 1 at 12:03AM CDT until June 1 at 12:30AM CDT by NWS Sioux Falls SD |
| Expires | 2026-06-01T00:30:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.798304e17c1c66e865b55c71963d3392c573d6f4.002.1","noaa_urn:oid:2.49.0.1.840.0.4671f920746e886ed6ce296b1c6a3e976cabe225.001.1","noaa_urn:oid:2.49.0.1.840.0.d12fb6481d7b169bb0bdb777fd09c6c9c3a14b78.001.1"] |
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 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.
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