Right now
The most recent data we hold from NOAA arrived 15 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 06:00 UTC. It is kept here as a record.
It is the 4th strongest of the 31 detections recorded within 20 km of this point since 15 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 1 at 12:18AM CDT until June 1 at 1:00AM CDT by NWS Omaha/Valley NE
Nearby, since 15 April 2026
- May 16, 2026 · score 22 · 10.9 km
- June 1, 2026 · score 22 · 16.0 km
- June 1, 2026 · score 22 · 22.6 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.64/1 |
| Coordinates | 41.8993, -95.7728 |
| Nearest City | Council Bluffs (71 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-01T05:18:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.1ad20e9e78c4505bcadb19c23eddd963 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-01T05:18:00.000Z.
First archived: 2026-06-01T05:21:15.186Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Shelby, IA; Monona, IA; Burt, NE; Thurston, NE; Woodbury, IA and 1 more areas |
| Headline | Severe Thunderstorm Warning issued June 1 at 12:18AM CDT until June 1 at 1:00AM CDT by NWS Omaha/Valley NE |
| Expires | 2026-06-01T01:00:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1ad20e9e78c4505bcadb19c23eddd963df1214b2.001.1","noaa_urn:oid:2.49.0.1.840.0.8172660bc720046c7c21e5f0654d726d0f6fb9c8.001.1","noaa_urn:oid:2.49.0.1.840.0.3c5bf7d40c1788eba782f0a7fb67d87579cda55d.001.1","noaa_urn:oid:2.49.0.1.840.0.c84bc00ae2c1da26e4632d6b80c4fe9011c133c2.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Woodbine |
| Iem County | Harrison |
| Iem State | IA |
| Iem Wfo | OAX |
| MergedSources | [{"id":"iem_H_41.740_-95.710_1780289760000","source":"iem","severity":"low","severityValue":25,"timestamp":1780289760000,"latitude":41.74,"longitude":-95.71}] |
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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