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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 27 June 2026 at 06:00 UTC. It is kept here as a record.
It is the 4th strongest of the 76 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued June 26 at 8:36PM MDT until June 27 at 12:00AM MDT by NWS Billings MT
Nearby, since 17 March 2026
- September 6, 2026 · score 28 · 0.0 km
- August 30, 2026 · score 22 · 0.0 km
- July 26, 2026 · score 22 · 0.0 km
How we know
2 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 | 0.64/1 |
| Coordinates | 46.8000, -110.4000 |
| Nearest City | Great Falls (103 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-27T02:36:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.27063ff727fc26e68d457854c4307b83 |
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: 2026-06-27T02:36:00.000Z.
First archived: 2026-06-27T03:06:50.724Z. 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 | Carter, MT; Custer, MT; Powder River, MT; Rosebud, MT; Garfield, MT; Petroleum, MT; Phillips, MT; Valley, MT |
| Headline | Severe Thunderstorm Watch issued June 26 at 8:36PM MDT until June 27 at 12:00AM MDT by NWS Billings MT |
| Expires | 2026-06-27T00:00:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | false |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.27063ff727fc26e68d457854c4307b83ba55dcc9.002.1","noaa_urn:oid:2.49.0.1.840.0.83b52d9bb72742a88c4d498bb93b95231545c67f.002.1","noaa_urn:oid:2.49.0.1.840.0.83b52d9bb72742a88c4d498bb93b95231545c67f.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 0.9 |
| Iem Unit | Inch |
| Iem City | Stanford |
| Iem County | Judith Basin |
| Iem State | MT |
| Iem Wfo | TFX |
| Iem Remark | Trained spotter measured 0.9 inches of rain in 45 minutes with some ponding. |
| MergedSources | [{"id":"iem_R_47.150_-110.220_1782518100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782518100000,"latitude":47.15,"longitude":-110.22}] |
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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