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.
This alert expired on 22 May 2026 at 01:45 UTC. It is kept here as a record.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 21 at 7:09PM MDT until May 21 at 7:45PM MDT by NWS Denver CO
How we know
9 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 | 39.6538, -103.3227 |
| Nearest City | Parker (124 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-22T01:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.07c5ecc46ff4be13fa7194274841b2e7 |
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: 2026-05-22T01:09:00.000Z.
First archived: 2026-05-22T01:16:54.104Z. 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 | Adams, CO; Eastern Arapahoe, CO; Washington, CO; Washington, CO |
| Headline | Severe Thunderstorm Warning issued May 21 at 7:09PM 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 |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.07c5ecc46ff4be13fa7194274841b2e7f1527fce.001.1","noaa_urn:oid:2.49.0.1.840.0.5c1f06a2621071522ea14cec861e69ea6a3bf933.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.75 |
| Iem Unit | Inch |
| Iem City | 7 S Last Chance |
| Iem County | Washington |
| Iem State | CO |
| Iem Wfo | BOU |
| Iem Remark | Report from mPING: Golf Ball (1.75 in.). |
| MergedSources | [{"id":"iem_H_39.610_-103.240_1779407040000","source":"iem","severity":"low","severityValue":25,"timestamp":1779407040000,"latitude":39.61,"longitude":-103.24},{"id":"iem_H_39.580_-103.220_1779407220000","source":"iem","severity":"low","severityValue":25,"timestamp":1779407220000,"latitude":39.58,"longitude":-103.22},{"id":"iem_T_39.610_-103.270_1779406500000","source":"iem","severity":"low","severityValue":25,"timestamp":1779406500000,"latitude":39.61,"longitude":-103.27},{"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},{"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_39.650_-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}] |
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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