Right now
The most recent data we hold from NOAA arrived 12 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 5 km from here.
This alert expired on 18 September 2026 at 03:30 UTC. It is kept here as a record.
No stronger detection stands among the 16 recorded within 20 km of this point since 27 April 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 17 at 8:54PM MDT until September 17 at 9:30PM MDT by NWS North Platte NE
Nearby, since 27 April 2026
- September 18, 2026 · score 28 · 5.2 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 28 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 28 / 100 |
| Legacy data-support index | 0.71/1 |
| Coordinates | 41.8080, -102.0990 |
| Nearest City | North Platte (135 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-18T02:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.62b95f46c7d5d008688a6aaaf6f2c0093b0b025e.001.1 |
Physical priority index · v5. 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: 2026-09-18T02:54:00.000Z.
First archived: 2026-09-18T02:58:25.649Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-18T03:03:53.356Z · data_change
Index 28 → 28; severity high → high; version 5 → 5.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Arthur, NE; Garden, NE; Grant, NE |
| Headline | Severe Thunderstorm Warning issued September 17 at 8:54PM MDT until September 17 at 9:30PM MDT by NWS North Platte NE |
| Expires | 2026-09-17T21:30:00-06:00 |
| SenderName | NWS North Platte NE |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.62b95f46c7d5d008688a6aaaf6f2c0093b0b025e.001.1","noaa_urn:oid:2.49.0.1.840.0.6ca7897263e52a17355baa24e51a01c493497e3d.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 150 |
| Spc Location | 9 ESE Broadwater |
| Spc County | Morrill |
| Spc State | NE |
| Spc Comments | Report of 1.5 inch hail on U-26 between Broadwater and Lisco. (CYS) |
| Iem TypeSummary | H |
| Iem Magnitude | 0.5 |
| Iem Unit | Inch |
| Iem City | 8 E Broadwater |
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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