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 16 July 2026 at 23:30 UTC. It is kept here as a record.
No stronger detection stands among the 14 recorded within 20 km of this point since 13 May 2026 — 8 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 16 at 4:29PM MDT until July 16 at 5:30PM MDT by NWS Great Falls MT
Urban PEI: 32,091 within a heuristic 50 km radius; not unique people.
Nearby, since 13 May 2026
- July 18, 2026 · score 34 · 22.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 46.8664, -111.5268 |
| Nearest City | Helena (50 km) |
| Urban exposure index (PEI) | 32.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-16T22:29:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.899977529235bdfe4f7ef86fa37810c7 |
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: 2026-07-16T22:29:00.000Z.
First archived: 2026-07-16T22:39:43.430Z. 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 | Cascade, MT; Lewis and Clark, MT; Fergus, MT; Judith Basin, MT; Lewis and Clark, MT and 1 more areas |
| Headline | Severe Thunderstorm Warning issued July 16 at 4:29PM MDT until July 16 at 5:30PM MDT by NWS Great Falls MT |
| Expires | 2026-07-16T17:30:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.899977529235bdfe4f7ef86fa37810c7a01f6889.001.1","noaa_urn:oid:2.49.0.1.840.0.21f85c96b0a3f9e3bf8d399dfccacf717c959df6.001.1","noaa_urn:oid:2.49.0.1.840.0.ffcc64c10ce8013a47a113a62d3e9cd81f175fc9.001.1","noaa_urn:oid:2.49.0.1.840.0.da9b810e2bcd49e55231886d13b04d8ecb9d6675.001.1"] |
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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