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 27 June 2026 at 21:47 UTC. It is kept here as a record.
No stronger detection stands among the 8 recorded within 20 km of this point since 27 June 2026 — 3 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: Flash Flood Warning issued June 27 at 3:37PM MDT until June 27 at 3:45PM MDT by NWS Billings MT
An estimated 117,116 people live within 50 km of this point.
Nearby, since 27 June 2026
- July 16, 2026 · score 43 · 8.3 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 87 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 43 / 100 |
| Our confidence | 87% |
| Coordinates | 45.5958, -107.9614 |
| Nearest City | Billings (47 km) |
| Population Exposed | 117.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-27T21:37:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.950603e070c91c5d3554e23e6bd07615 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Stillwater, MT; Yellowstone, MT; Big Horn, MT and 1 more areas |
| Headline | Flash Flood Warning issued June 27 at 3:37PM MDT until June 27 at 3:45PM MDT by NWS Billings MT |
| Expires | 2026-06-27T15:47:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.950603e070c91c5d3554e23e6bd0761582ec85fd.001.1","noaa_urn:oid:2.49.0.1.840.0.5a1f6937d5a56f45cb9e570115c1a3fc06f80748.001.1","noaa_urn:oid:2.49.0.1.840.0.4c0b22b824d5e2fa4e3eda44dafbd6adf5fe0fec.001.1","noaa_urn:oid:2.49.0.1.840.0.6a3c3f269aa4fc2aa610e083110096b2bbeaebd2.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 0.88 |
| Iem Unit | Inch |
| Iem City | Laurel |
| Iem County | Yellowstone |
| Iem State | MT |
| Iem Wfo | BYZ |
| Iem Remark | Dime to nickel sized hail. Rainfall filling curbs. |
| MergedSources | [{"id":"iem_H_45.750_-108.570_1782590400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782590400000,"latitude":45.75,"longitude":-108.57},{"id":"iem_H_45.680_-108.770_1782590400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782590400000,"latitude":45.68,"longitude":-108.77},{"id":"iem_H_45.680_-108.780_1782588900000","source":"iem","severity":"low","severityValue":25,"timestamp":1782588900000,"latitude":45.68,"longitude":-108.78}] |
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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