Right now
The most recent data we hold from NOAA arrived 69 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 02:00 UTC. It is kept here as a record.
It is the 22nd strongest of the 79 detections recorded within 20 km of this point since 5 May 2026. The last comparable one was on 4 June 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 20 at 7:32PM MDT until June 20 at 8:00PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- June 4, 2026 · score 16 · 3.5 km
- May 31, 2026 · score 28 · 9.6 km
- May 30, 2026 · score 46 · 15.2 km
How we know
2 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 | 0.65/1 |
| Coordinates | 41.1978, -103.9618 |
| Nearest City | Cheyenne (72 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-21T01:32:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.415248ef5cdd5bd94f789b748bac5dd0 |
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: 2026-06-21T01:32:00.000Z.
First archived: 2026-06-21T01:42:04.805Z. 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 | Kimball, NE; Banner, NE; Cheyenne, NE; Kimball, NE; Morrill, NE; Scotts Bluff, NE; Kimball, NE; Laramie, WY and 1 more areas |
| Headline | Severe Thunderstorm Warning issued June 20 at 7:32PM MDT until June 20 at 8:00PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-20T20:00:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.415248ef5cdd5bd94f789b748bac5dd019025897.002.1","noaa_urn:oid:2.49.0.1.840.0.1cee2d5af230ed9ba23ae517b2e72001f9a56cd7.001.1","noaa_urn:oid:2.49.0.1.840.0.8268a22524d9725019ae48ad0af63e03ea88a6f9.001.1","noaa_urn:oid:2.49.0.1.840.0.fa9f4d0aeaad7de1fdbac061790ad6654f34b8a8.001.1"] |
| 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_41.650_-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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens in this area?