Right now
The most recent data we hold from NOAA arrived 47 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 28 June 2026 at 04:45 UTC. It is kept here as a record.
It is the 6th strongest of the 29 detections recorded within 20 km of this point since 8 April 2026. 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: Flash Flood Warning issued June 27 at 7:50PM MDT until June 27 at 10:45PM MDT by NWS Glasgow MT
Nearby, since 8 April 2026
- September 3, 2026 · score 28 · 18.0 km
- May 27, 2026 · score 22 · 20.9 km
How we know
4 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 | 0.69/1 |
| Coordinates | 47.9476, -105.3639 |
| Nearest City | Williston (132 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-28T01:50:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.1db7d23a456d98709bb53af63613f76d |
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: 2026-06-28T01:50:00.000Z.
First archived: 2026-06-28T01:54:10.140Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Richland, MT; Roosevelt, MT; Roosevelt, MT; Garfield, MT and 1 more areas |
| Headline | Flash Flood Warning issued June 27 at 7:50PM MDT until June 27 at 10:45PM MDT by NWS Glasgow MT |
| Expires | 2026-06-27T22:45:00-06:00 |
| SenderName | NWS Glasgow MT |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1db7d23a456d98709bb53af63613f76d1cbf6d87.001.1","noaa_urn:oid:2.49.0.1.840.0.ba5d759a8310a20b07bafc0306b6f1c6f12f0072.001.1","noaa_urn:oid:2.49.0.1.840.0.1dd150b2b303ff7f51c7007e5add712986511a1f.001.1","noaa_urn:oid:2.49.0.1.840.0.7c011d6eee6b04369e8313df3d3c73cf404c5485.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.75 |
| Iem Unit | Inch |
| Iem City | 20 S Brockton |
| Iem County | Richland |
| Iem State | MT |
| Iem Wfo | GGW |
| MergedSources | [{"id":"iem_H_47.470_-105.600_1782591900000","source":"iem","severity":"low","severityValue":25,"timestamp":1782591900000,"latitude":47.47,"longitude":-105.6},{"id":"iem_H_47.950_-104.940_1782604440000","source":"iem","severity":"low","severityValue":25,"timestamp":1782604440000,"latitude":47.95,"longitude":-104.94},{"id":"iem_H_47.860_-104.920_1782606120000","source":"iem","severity":"low","severityValue":25,"timestamp":1782606120000,"latitude":47.86,"longitude":-104.92}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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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