Right now
The most recent data we hold from NOAA arrived 16 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 04:15 UTC. It is kept here as a record.
It is the 38th strongest of the 99 detections recorded within 20 km of this point since 6 May 2026. The last comparable one was on 9 June 2026. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 20 at 9:37PM MDT until June 20 at 10:15PM MDT by NWS Denver CO
Nearby, since 6 May 2026
- September 5, 2026 · score 28 · 16.2 km
- August 12, 2026 · score 22 · 18.5 km
- May 30, 2026 · score 16 · 23.4 km
How we know
3 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 | 40.6260, -103.4020 |
| Nearest City | Evans (112 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-21T03:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.23b3e62b5118544951fc811ab5315c35ab27e56e.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: 2026-06-21T03:37:00.000Z.
First archived: 2026-06-21T03:46:25.255Z. 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 | Logan, CO |
| Headline | Severe Thunderstorm Warning issued June 20 at 9:37PM MDT until June 20 at 10:15PM MDT by NWS Denver CO |
| Expires | 2026-06-20T22:15:00-06:00 |
| 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_40.920_-104.020_1782006840000","source":"iem","severity":"low","severityValue":25,"timestamp":1782006840000,"latitude":40.92,"longitude":-104.02},{"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.
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