Right now
The most recent data we hold from NOAA arrived 3 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 22 May 2026 at 01:45 UTC. It is kept here as a record.
It is the 4th strongest of the 31 detections recorded within 20 km of this point since 6 May 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 21 at 7:23PM MDT until May 21 at 7:45PM MDT by NWS Denver CO
Nearby, since 6 May 2026
- August 12, 2026 · score 22 · 12.1 km
- July 11, 2026 · score 22 · 15.2 km
How we know
6 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 | 39.7025, -103.6563 |
| Nearest City | Parker (97 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-22T01:23:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.99ea3d26c57387d22b68589417feeac0f44ca6fa.002.1 |
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: 2026-05-22T01:23:00.000Z.
First archived: 2026-05-22T01:42:41.820Z. 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 | Eastern Arapahoe, CO; Washington, CO |
| Headline | Severe Thunderstorm Warning issued May 21 at 7:23PM MDT until May 21 at 7:45PM MDT by NWS Denver CO |
| Expires | 2026-05-21T19:45:00-06:00 |
| SenderName | NWS Denver CO |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 2.5 |
| Iem Unit | Inch |
| Iem City | 5 SSE Last Chance |
| Iem County | Washington |
| Iem State | CO |
| Iem Wfo | BOU |
| MergedSources | [{"id":"iem_H_39.650_-103.590_1779403800000","source":"iem","severity":"low","severityValue":25,"timestamp":1779403800000,"latitude":39.65,"longitude":-103.59},{"id":"iem_H_39.620_-103.590_1779404280000","source":"iem","severity":"low","severityValue":25,"timestamp":1779404280000,"latitude":39.62,"longitude":-103.59},{"id":"iem_H_39.620_-104.040_1779399840000","source":"iem","severity":"low","severityValue":25,"timestamp":1779399840000,"latitude":39.62,"longitude":-104.04},{"id":"iem_H_39.640_-103.410_1779405540000","source":"iem","severity":"low","severityValue":25,"timestamp":1779405540000,"latitude":39.64,"longitude":-103.41},{"id":"iem_H_39.670_-103.530_1779404760000","source":"iem","severity":"low","severityValue":25,"timestamp":1779404760000,"latitude":39.67,"longitude":-103.53}] |
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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