Right now
The most recent data we hold from NOAA arrived 25 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 04:00 UTC. It is kept here as a record.
It is the 4th strongest of the 31 detections recorded within 20 km of this point since 19 March 2026. The last comparable one was on 27 June 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 27 at 7:05PM MDT until June 27 at 10:00PM MDT by NWS Glasgow MT
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 | 47.8964, -105.6040 |
| Nearest City | Williston (150 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-28T01:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.ba5d759a8310a20b07bafc0306b6f1c6 |
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: 2026-06-28T01:05:00.000Z.
First archived: 2026-06-28T01:48:54.166Z. 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 | Roosevelt, MT; Garfield, MT; Richland, MT |
| Headline | Flash Flood Warning issued June 27 at 7:05PM MDT until June 27 at 10:00PM MDT by NWS Glasgow MT |
| Expires | 2026-06-27T22:00:00-06:00 |
| SenderName | NWS Glasgow MT |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["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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