Right now
The most recent data we hold from NOAA arrived 1 minute 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 September 2026 at 09:00 UTC. It is kept here as a record.
It is the 97th strongest of the 118 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 20 at 11:25PM MDT until September 21 at 3:00AM MDT by NWS Denver CO
Nearby, since 15 March 2026
- September 19, 2026 · score 16 · 0.0 km
- September 5, 2026 · score 16 · 0.0 km
- August 13, 2026 · score 22 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Legacy data-support index | 0.62/1 |
| Coordinates | 39.1000, -105.4000 |
| Nearest City | Castle Rock (55 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-21T05:25:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.9ee4e069d401262776af8f62cea7b01660c2690e.002.1 |
Physical priority index · v5. 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: 2026-09-21T05:25:00.000Z.
First archived: 2026-09-21T05:31:27.963Z. 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 Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Elbert, CO; Lincoln, CO; Cheyenne, CO; Kit Carson, CO; Greeley, KS; Logan, KS; Wallace, KS; Wichita, KS; Kiowa, CO; Prowers, CO and 1 more areas |
| Headline | Severe Thunderstorm Watch issued September 20 at 11:25PM MDT until September 21 at 3:00AM MDT by NWS Denver CO |
| Expires | 2026-09-21T03:00:00-06:00 |
| SenderName | NWS Denver CO |
| HasExactCoords | false |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9ee4e069d401262776af8f62cea7b01660c2690e.002.1","noaa_urn:oid:2.49.0.1.840.0.aa17dde93e504a8220c00b22d841158f8ab50015.001.2","noaa_urn:oid:2.49.0.1.840.0.19996ce6b430436f7bc3af6fbbdfb71afea5731b.001.2","noaa_urn:oid:2.49.0.1.840.0.19996ce6b430436f7bc3af6fbbdfb71afea5731b.002.1"] |
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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