Right now
The most recent data we hold from NOAA arrived 5 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 05:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 86 detections recorded within 20 km of this point since 18 April 2026. The last comparable one was on 1 June 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 20 at 10:22PM MDT until June 20 at 11:00PM MDT by NWS Denver CO
Urban PEI: 490,123 within a heuristic 50 km radius; not unique people.
Nearby, since 18 April 2026
- September 7, 2026 · score 41 · 1.9 km
- September 7, 2026 · score 41 · 7.0 km
- July 2, 2026 · score 48 · 16.6 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 40.4200, -104.6220 |
| Nearest City | Evans (7 km) |
| Urban exposure index (PEI) | 490.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-21T04:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.3c619c93265910bd4758b60c64aac1989c823b40.001.1 |
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: 2026-06-21T04:22:00.000Z.
First archived: 2026-06-21T04:33:12.278Z. 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 |
| Headline | Severe Thunderstorm Warning issued June 20 at 10:22PM MDT until June 20 at 11:00PM MDT by NWS Denver CO |
| Expires | 2026-06-20T23:00:00-06:00 |
| SenderName | NWS Denver CO |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1.25 |
| Iem Unit | Inch |
| Iem City | 8 NE Grover |
| Iem County | Weld |
| Iem State | CO |
| Iem Wfo | BOU |
| Iem Remark | Report from mPING: Half Dollar (1.25 in.). |
| 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_40.960_-104.120_1782008460000","source":"iem","severity":"low","severityValue":25,"timestamp":1782008460000,"latitude":40.96,"longitude":-104.12}] |
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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