Right now
The most recent data we hold from NOAA arrived 4 hours 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 00:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 28 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 15 at 6:45PM CDT until May 15 at 7:30PM CDT by NWS Omaha/Valley NE
Nearby, since 16 March 2026
- September 6, 2026 · score 16 · 4.7 km
- August 13, 2026 · score 46 · 7.7 km
- May 15, 2026 · score 22 · 10.6 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 | 0.65/1 |
| Coordinates | 42.1454, -95.4691 |
| Nearest City | Sioux City (86 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-15T23:45:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f434b315e4d59913ea8e7fcbc555b2b3 |
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: 2026-05-15T23:45:00.000Z.
First archived: 2026-05-15T23:46:36.950Z. 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 | Saline, NE; Fremont, IA; Mills, IA; Montgomery, IA; Page, IA; Fillmore, NE; Thayer, NE and 6 more areas |
| Headline | Severe Thunderstorm Warning issued May 15 at 6:45PM CDT until May 15 at 7:30PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-15T19:30:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f434b315e4d59913ea8e7fcbc555b2b3ac45ae5c.001.1","noaa_urn:oid:2.49.0.1.840.0.91590a05b51398fa89a874b580f547ab0d8a51de.002.1","noaa_urn:oid:2.49.0.1.840.0.13e8ed3343c611133067892b66e531ddc32def92.001.1","noaa_urn:oid:2.49.0.1.840.0.a76ac3761b40268f177424332483b7ffe6c6c6a4.002.1","noaa_urn:oid:2.49.0.1.840.0.82b118a840c518c7af4bdfb2561c3b947dd33f58.001.1","noaa_urn:oid:2.49.0.1.840.0.aacb82868d64dc6f6e0edfa8aacfeb411a12d859.001.1","noaa_urn:oid:2.49.0.1.840.0.df4ab30e13c7260558904b633d3e32a210ce8ecb.001.1","noaa_urn:oid:2.49.0.1.840.0.1df97b77674e832338e3ade5be6419b904a1f388.001.1","noaa_urn:oid:2.49.0.1.840.0.27f628920ce6b968e47b7583428cd6a78ba8db4b.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. |
| MergedSources | [{"id":"iem_H_42.310_-96.130_1778886000000","source":"iem","severity":"low","severityValue":25,"timestamp":1778886000000,"latitude":42.31,"longitude":-96.13}] |
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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