This alert expired on 1 July 2026 at 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 37 recorded within 20 km of this point since 15 March 2026 — 15 others scored the same. The last comparable one was on 30 June 2026. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 1 at 2:51PM MDT until July 1 at 5:45PM MDT by NWS Great Falls MT
An estimated 32,091 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 23, 2026 · score 34 · 17.9 km
- July 18, 2026 · score 34 · 18.1 km
- July 16, 2026 · score 34 · 21.6 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, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 80% |
| Coordinates | 46.5331, -111.7385 |
| Nearest City | Helena (24 km) |
| Population Exposed | 32.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-01T20:51:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6cb3da10585df3f6c1a69813312c186275dc7b86.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Broadwater, MT; Jefferson, MT; Lewis and Clark, MT |
| Headline | Flash Flood Warning issued July 1 at 2:51PM MDT until July 1 at 5:45PM MDT by NWS Great Falls MT |
| Expires | 2026-07-01T17:45:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 34/100, near Helena (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.