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 19 May 2026 at 01:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 37 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 7:38PM CDT until May 18 at 8:00PM CDT by NWS Omaha/Valley NE
Urban PEI: 56,308 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- July 10, 2026 · score 39 · 4.1 km
- June 6, 2026 · score 39 · 17.7 km
- July 9, 2026 · score 39 · 24.3 km
How we know
7 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 39.3415, -96.1682 |
| Nearest City | Manhattan (39 km) |
| Urban exposure index (PEI) | 56.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T00:38:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.2ad28d8dd7051d5f27fd8aa769a95ce7 |
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: 2026-05-19T00:38:00.000Z.
First archived: 2026-05-19T00:39:50.563Z. 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, KS; Harrison, IA; Shelby, IA and 10 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 7:38PM CDT until May 18 at 8:00PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-18T20:00:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 13 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2ad28d8dd7051d5f27fd8aa769a95ce73863d293.001.1","noaa_urn:oid:2.49.0.1.840.0.18c9b861a746e7143096f43406a77cb0bee71c2a.001.1","noaa_urn:oid:2.49.0.1.840.0.94939360de54bc241013d5cb2521c8a176cff75d.001.1","noaa_urn:oid:2.49.0.1.840.0.69c489161c76c18bcfea979451b8a87d41bb711f.001.1","noaa_urn:oid:2.49.0.1.840.0.cfbc247b127232643298e1648fc4cc567b6e7bb3.001.1","noaa_urn:oid:2.49.0.1.840.0.0a264ca16894152c654992bf3e0e91f397dd9368.001.1","noaa_urn:oid:2.49.0.1.840.0.48d743ee90986a8840c2f045200de0f10ed74d91.001.1","noaa_urn:oid:2.49.0.1.840.0.b66a090e443a9502946bec235a664b26eb11e089.001.1","noaa_urn:oid:2.49.0.1.840.0.e972331356a184fc234e0ff633770105f6285792.002.1","noaa_urn:oid:2.49.0.1.840.0.003effb5a33a098ef72eec997887901e302f87ec.002.1","noaa_urn:oid:2.49.0.1.840.0.8aeeb96fa7eb007b2bcbcfaeb3170c02ddb9c03e.001.1","noaa_urn:oid:2.49.0.1.840.0.a944724d9dc24c2dfd8664a96418c135d292fdff.001.1","noaa_urn:oid:2.49.0.1.840.0.2f7d1806147c255b31011e3727e435d878c00af9.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 65 |
| Iem Unit | MPH |
| Iem City | 4 S Holton |
| Iem County | Jackson |
| Iem State | KS |
| Iem Wfo | TOP |
| Iem Remark | Measured on a personal weather station. |
| MergedSources | [{"id":"iem_G_39.110_-96.710_1779146520000","source":"iem","severity":"low","severityValue":25,"timestamp":1779146520000,"latitude":39.11,"longitude":-96.71},{"id":"iem_T_39.240_-97.020_1779143400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779143400000,"latitude":39.24,"longitude":-97.02},{"id":"iem_G_39.230_-96.570_1779146880000","source":"iem","severity":"low","severityValue":25,"timestamp":1779146880000,"latitude":39.23,"longitude":-96.57},{"id":"iem_G_39.270_-96.520_1779147660000","source":"iem","severity":"low","severityValue":25,"timestamp":1779147660000,"latitude":39.27,"longitude":-96.52},{"id":"iem_G_39.230_-96.340_1779148140000","source":"iem","severity":"low","severityValue":25,"timestamp":1779148140000,"latitude":39.23,"longitude":-96.34},{"id":"iem_G_39.400_-95.750_1779150360000","source":"iem","severity":"low","severityValue":25,"timestamp":1779150360000,"latitude":39.4,"longitude":-95.75}] |
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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