Right now
The most recent data we hold from NOAA arrived 4 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 16 May 2026 at 03:30 UTC. It is kept here as a record.
It is the 5th strongest of the 48 detections recorded within 20 km of this point since 15 March 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 May 15 at 10:03PM CDT until May 15 at 10:30PM CDT by NWS Omaha/Valley NE
Urban PEI: 575,122 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- September 3, 2026 · score 41 · 5.9 km
- June 1, 2026 · score 22 · 14.8 km
- August 13, 2026 · score 48 · 16.5 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 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) | 48 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 41.6459, -96.0358 |
| Nearest City | Omaha (44 km) |
| Urban exposure index (PEI) | 575.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-16T03:03:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5a7cd44ea9bb75e736bacda737acde4f |
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: 2026-05-16T03:03:00.000Z.
First archived: 2026-05-16T03:12:26.150Z. 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 | Harrison, IA; Monona, IA; Burt, NE; Washington, NE; Douglas, NE; Washington, NE |
| Headline | Severe Thunderstorm Warning issued May 15 at 10:03PM CDT until May 15 at 10:30PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-15T22:30:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5a7cd44ea9bb75e736bacda737acde4f5f06c3b2.001.1","noaa_urn:oid:2.49.0.1.840.0.bc55999111a1ef3684ca31af5ab712f7150d42a1.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 6 NNW Hornick |
| Iem County | Woodbury |
| Iem State | IA |
| Iem Wfo | FSD |
| Iem Remark | Hail covered the ground, with stones as big as quarters. No wind and a decent amount of rain. |
| Google News RssFeed | weather |
| Google News SourceName | KETV |
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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