Right now
The most recent data we hold from NOAA arrived 9 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 18 May 2026 at 23:19 UTC. It is kept here as a record.
It is the 4th strongest of the 64 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 6:09PM CDT until May 18 at 6:15PM CDT by NWS Omaha/Valley NE
Urban PEI: 640,589 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 13, 2026 · score 48 · 6.2 km
- July 9, 2026 · score 48 · 7.3 km
- May 18, 2026 · score 48 · 11.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.79/1 |
| Coordinates | 41.2156, -95.7690 |
| Nearest City | Council Bluffs (9 km) |
| Urban exposure index (PEI) | 640.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T23:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f6ef7d19f85f9d2925d68d4ba33214d4 |
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: 2026-05-18T23:09:00.000Z.
First archived: 2026-05-18T23:12:29.517Z. 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 | Page, IA; Atchison, MO; Holt, MO; Nodaway, MO; Adams, IA; Taylor, IA and 4 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 6:09PM CDT until May 18 at 6:15PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-18T18:19:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f6ef7d19f85f9d2925d68d4ba33214d48a0b3d50.001.1","noaa_urn:oid:2.49.0.1.840.0.e6be14a173188cbeecc4fcb6f8b70aa8739eb73a.001.1","noaa_urn:oid:2.49.0.1.840.0.5bbaf7ceda07f5462878ab72e60665d315e49b87.001.1","noaa_urn:oid:2.49.0.1.840.0.fd7cd85eedacb7449fbdc583a4d3576f9b6e5133.002.1","noaa_urn:oid:2.49.0.1.840.0.2f4148bf4357f61b7bdbbcad21be68eed75809f6.001.1","noaa_urn:oid:2.49.0.1.840.0.b15b1c4c7d1292c7fc090706e69969642f9df63a.001.1","noaa_urn:oid:2.49.0.1.840.0.1132cd14ea19d7cecda4c84d3b79bd10174e4b83.001.1","noaa_urn:oid:2.49.0.1.840.0.7e220cb01d54fa26de2cdf5328715ae30a3580c1.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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