This alert expired on 17 May 2026 at 23:15 UTC. It is kept here as a record.
No stronger detection stands among the 44 recorded within 20 km of this point since 15 March 2026 — 7 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued May 17 at 5:07PM CDT until May 17 at 6:15PM CDT by NWS Hastings NE
An estimated 51,440 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 10, 2026 · score 32 · 7.8 km
- July 8, 2026 · score 39 · 17.6 km
How we know
Confirmed by 8 independent sources, including NOAA.
Our own score for this event is 63 out of 100, at 89 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 | Critical |
| Calamity Score (ours) | 63 / 100 |
| Our confidence | 89% |
| Coordinates | 41.1433, -98.3058 |
| Nearest City | Grand Island (24 km) |
| Population Exposed | 51.4K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-05-17T22:07:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.4eaf4d9cf796f6a0a746e37dc2e83150 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Howard, NE; Merrick, NE; Nance, NE; Polk, NE; Howard, NE; Merrick, NE |
| Headline | Tornado Warning issued May 17 at 5:07PM CDT until May 17 at 6:15PM CDT by NWS Hastings NE |
| Expires | 2026-05-17T18:15:00-05:00 |
| SenderName | NWS Hastings NE |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4eaf4d9cf796f6a0a746e37dc2e83150595be31a.001.1","noaa_urn:oid:2.49.0.1.840.0.945fe67e8f37f1ef229e4e566845ee84406bba9e.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 2.5 |
| Iem Unit | Inch |
| Iem City | Ashton |
| Iem County | Sherman |
| Iem State | NE |
| Iem Wfo | GID |
| MergedSources | [{"id":"iem_H_41.230_-98.860_1779053700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779053700000,"latitude":41.23,"longitude":-98.86},{"id":"iem_H_41.250_-98.790_1779054660000","source":"iem","severity":"low","severityValue":25,"timestamp":1779054660000,"latitude":41.25,"longitude":-98.79},{"id":"iem_H_41.070_-98.720_1779053640000","source":"iem","severity":"low","severityValue":25,"timestamp":1779053640000,"latitude":41.07,"longitude":-98.72},{"id":"iem_T_41.050_-98.570_1779054660000","source":"iem","severity":"low","severityValue":25,"timestamp":1779054660000,"latitude":41.05,"longitude":-98.57},{"id":"iem_H_41.120_-98.550_1779054240000","source":"iem","severity":"low","severityValue":25,"timestamp":1779054240000,"latitude":41.12,"longitude":-98.55},{"id":"iem_H_41.000_-98.870_1779052440000","source":"iem","severity":"low","severityValue":25,"timestamp":1779052440000,"latitude":41,"longitude":-98.87},{"id":"iem_H_41.250_-98.790_1779053400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779053400000,"latitude":41.25,"longitude":-98.79}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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.
Want to know when something happens near Grand Island?
Calamity.live data shows a weather event with CalamityScore 63/100, near Grand Island (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.