Right now
The most recent data we hold from NOAA arrived 6 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 00:00 UTC. It is kept here as a record.
No stronger detection stands among the 14 recorded within 20 km of this point since 15 April 2026 — 3 others scored the same. 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 17 at 6:18PM CDT until May 17 at 7:00PM CDT by NWS Omaha/Valley NE
Urban PEI: 22,797 within a heuristic 50 km radius; not unique people.
How we know
9 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 41.0832, -97.5629 |
| Nearest City | Columbus (42 km) |
| Urban exposure index (PEI) | 22.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-17T23:18:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4b65a217d7606f810329c06cf3e635e5 |
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: 2026-05-17T23:18:00.000Z.
First archived: 2026-05-17T23:20:21.690Z. 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 | Platte, NE; Nuckolls, NE; Thayer, NE; Madison, NE; Stanton, NE; Wayne, NE and 11 more areas |
| Headline | Severe Thunderstorm Warning issued May 17 at 6:18PM CDT until May 17 at 7:00PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-17T19:00:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 14 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4b65a217d7606f810329c06cf3e635e521a151c9.001.1","noaa_urn:oid:2.49.0.1.840.0.7c0788a7ae5fd546279df260cec0b71eff7b026c.001.1","noaa_urn:oid:2.49.0.1.840.0.d30f59e220cd16e4ff8ba72b0ef00dbefeb61eb8.001.1","noaa_urn:oid:2.49.0.1.840.0.9e231514bcc9a663aede54abab2a94abb0a5470d.001.1","noaa_urn:oid:2.49.0.1.840.0.237f915d95fbda21a625a5e3448b3b7c96570dd4.001.1","noaa_urn:oid:2.49.0.1.840.0.00015290f780fcaa708eb95541262a83699c71e8.001.1","noaa_urn:oid:2.49.0.1.840.0.a4d1a6e6aad33fe17e4e0fcb792ae8c1380fc8e5.001.1","noaa_urn:oid:2.49.0.1.840.0.1b15699a6ba0b8b2daeb88cf83c1445713bf5a82.001.1","noaa_urn:oid:2.49.0.1.840.0.b34d707cadade8c027f40b180a8acd35e4f8a32d.001.1","noaa_urn:oid:2.49.0.1.840.0.3ab6f4336e1d7bfca1da2262004e5afc87043ae7.001.1","noaa_urn:oid:2.49.0.1.840.0.d809dcb9159c2637822e490e4b54ffdaf7e36053.001.1","noaa_urn:oid:2.49.0.1.840.0.8fdfcccea96eb27faadd9524519dd157d2bb77ab.001.1","noaa_urn:oid:2.49.0.1.840.0.c618e55150d47ab87b3a230964891b1acccc5fba.001.1","noaa_urn:oid:2.49.0.1.840.0.5c67a7ff8b2b6ead6c6014620690fe1647f57ee3.002.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 3.5 |
| Iem Unit | Inch |
| Iem City | 1 W Palmer |
| Iem County | Merrick |
| Iem State | NE |
| Iem Wfo | GID |
| MergedSources | [{"id":"iem_T_41.080_-98.380_1779055440000","source":"iem","severity":"low","severityValue":25,"timestamp":1779055440000,"latitude":41.08,"longitude":-98.38},{"id":"iem_G_41.300_-98.200_1779057120000","source":"iem","severity":"low","severityValue":25,"timestamp":1779057120000,"latitude":41.3,"longitude":-98.2},{"id":"iem_H_41.190_-98.360_1779056100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779056100000,"latitude":41.19,"longitude":-98.36},{"id":"iem_G_40.520_-98.050_1779058020000","source":"iem","severity":"low","severityValue":25,"timestamp":1779058020000,"latitude":40.52,"longitude":-98.05},{"id":"iem_T_41.130_-98.360_1779055800000","source":"iem","severity":"low","severityValue":25,"timestamp":1779055800000,"latitude":41.13,"longitude":-98.36},{"id":"iem_G_41.300_-98.200_1779057540000","source":"iem","severity":"low","severityValue":25,"timestamp":1779057540000,"latitude":41.3,"longitude":-98.2},{"id":"iem_G_41.240_-98.310_1779056280000","source":"iem","severity":"low","severityValue":25,"timestamp":1779056280000,"latitude":41.24,"longitude":-98.31},{"id":"iem_H_41.220_-98.250_1779056700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779056700000,"latitude":41.22,"longitude":-98.25}] |
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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