Right now
The most recent data we hold from NOAA arrived 53 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 21 June 2026 at 02:30 UTC. It is kept here as a record.
It is the 9th strongest of the 56 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 June 20 at 7:52PM MDT until June 20 at 8:30PM MDT by NWS Denver CO
Nearby, since 15 March 2026
- June 4, 2026 · score 16 · 14.4 km
- May 31, 2026 · score 28 · 18.6 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 41.1996, -104.0923 |
| Nearest City | Cheyenne (61 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-21T01:52:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.1970d8c113d568f5532d3b111d4fa278 |
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: 2026-06-21T01:52:00.000Z.
First archived: 2026-06-21T02:02:37.167Z. 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 | Weld, CO; Laramie, WY; Banner, NE; Cheyenne, NE; Kimball, NE; Morrill, NE; Scotts Bluff, NE |
| Headline | Severe Thunderstorm Warning issued June 20 at 7:52PM MDT until June 20 at 8:30PM MDT by NWS Denver CO |
| Expires | 2026-06-20T20:30:00-06:00 |
| SenderName | NWS Denver CO |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1970d8c113d568f5532d3b111d4fa278e2e5315e.001.1","noaa_urn:oid:2.49.0.1.840.0.d4bb8ef81808773653444cb86ffcc194d4f5a56c.001.1","noaa_urn:oid:2.49.0.1.840.0.a798ab02f7d09ddfa27e238e38cdd4825f3a7dd6.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 0.75 |
| Iem Unit | Inch |
| Iem City | 7 W La Grange |
| Iem County | Goshen |
| Iem State | WY |
| Iem Wfo | CYS |
| Iem Remark | Penny sized hail measured. |
| MergedSources | [{"id":"iem_H_41.040_-104.280_1782004560000","source":"iem","severity":"low","severityValue":25,"timestamp":1782004560000,"latitude":41.04,"longitude":-104.28},{"id":"iem_H_41.040_-104.260_1782004140000","source":"iem","severity":"low","severityValue":25,"timestamp":1782004140000,"latitude":41.04,"longitude":-104.26},{"id":"iem_H_41.650_-104.290_1781990640000","source":"iem","severity":"low","severityValue":25,"timestamp":1781990640000,"latitude":41.65,"longitude":-104.29}] |
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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