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 18 May 2026 at 03:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 68 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 17 at 9:03PM CDT until May 17 at 10:15PM CDT by NWS Omaha/Valley NE
Urban PEI: 640,589 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- July 9, 2026 · score 48 · 7.8 km
- September 15, 2026 · score 54 · 16.7 km
- May 18, 2026 · score 48 · 20.1 km
How we know
15 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 | 41.0275, -96.0987 |
| Nearest City | Papillion (14 km) |
| Urban exposure index (PEI) | 640.6K within 50 km |
| Impact Tier | significant |
| Date | 2026-05-18 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.df5de06e5d7f1392e5756c7b21f90036 |
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: 2026-05-18 — time not reported.
First archived: 2026-05-18T02:04:20.507Z. 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 | Fremont, IA; Mills, IA; Montgomery, IA; Page, IA; Cass, NE; Otoe, NE; Sarpy, NE; Harrison, IA; Monona, IA; Marshall, KS; Washington, KS and 15 more areas |
| Headline | Severe Thunderstorm Warning issued May 17 at 9:03PM CDT until May 17 at 10:15PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-17T22:15:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 19 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.df5de06e5d7f1392e5756c7b21f90036ac493f5f.001.1","noaa_urn:oid:2.49.0.1.840.0.c4876b21806a37360c57e3e78e4bca64484a7ff1.001.1","noaa_urn:oid:2.49.0.1.840.0.d67d916fab6f876e0e92f4288706f03fafa88802.001.1","noaa_urn:oid:2.49.0.1.840.0.963b1a7b1e6ef6660a7b9c0646c33f4dd5240c51.001.1","noaa_urn:oid:2.49.0.1.840.0.03cea8898672ad9575e5e69b95d8b1df5e96a02b.001.1","noaa_urn:oid:2.49.0.1.840.0.818552ae93cbb790cbe3272d8a60a9050ee40936.001.1","noaa_urn:oid:2.49.0.1.840.0.f717ca15d5b2701b17fbf2c66f7bf20716a37076.001.1","noaa_urn:oid:2.49.0.1.840.0.646d6660b6eed5bd7498f51131ec33b84d678bd7.001.1","noaa_urn:oid:2.49.0.1.840.0.ee8b2d5ff7a671d6f1708cd4d891d98d590254b6.001.1","noaa_urn:oid:2.49.0.1.840.0.f71815c04e40e804b602ba0b20230797df9adcfe.001.1","noaa_urn:oid:2.49.0.1.840.0.53644d6b79a6a658bebaaebe1049989fb5be2fc1.001.1","noaa_urn:oid:2.49.0.1.840.0.7744a48215a5b4eae6e280b1a0474ac59b67975a.001.1","noaa_urn:oid:2.49.0.1.840.0.3b5c4dd44ef0aa5fc827fc70ea6697a71450c85d.001.1","noaa_urn:oid:2.49.0.1.840.0.e52c4a2c482d7e25c61a5657ce2c376fcc21bda1.001.1","noaa_urn:oid:2.49.0.1.840.0.5952180d5e0eb32d5e504ac3622494cb423c7e9a.001.1","noaa_urn:oid:2.49.0.1.840.0.386b1ee7c64188026c9b647afadc5ec83c9d01be.002.1","noaa_urn:oid:2.49.0.1.840.0.42f6c8b2079558ae0b443c181835a16a482aa1c4.001.1","noaa_urn:oid:2.49.0.1.840.0.9701c0f7cf6c8a4b47eef93a0398ae9916423944.001.1","noaa_urn:oid:2.49.0.1.840.0.3298a29f5f8c4442fc28a6ec3ea13c8c963ddb4e.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 59 |
| Iem Unit | MPH |
| Iem City | 4 WSW Murdock |
| Iem County | Cass |
| Iem State | NE |
| Iem Wfo | OAX |
| Iem Remark | Personal Weather Station. |
| Google News RssFeed | weather |
| Google News SourceName | Omaha World-Herald |
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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