Reported by SPC today.
No stronger detection stands among the 30 recorded within 20 km of this point since 14 March 2026 — 15 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
SPC reported: Wind 73 kt near 11 W Helena, Lewis and Clark, MT. (TFX)
An estimated 32,091 people live within 50 km of this point.
How we know
Confirmed by 2 independent sources, including SPC.
Our own score for this event is 28 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 90% |
| Coordinates | 46.5800, -112.2500 |
| Nearest City | Helena (16 km) |
| Population Exposed | 32.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T20:28:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Score Breakdown
Technical Details
| ReportType | wind |
| Speed | 73 |
| Location | 11 W Helena |
| County | Lewis and Clark |
| State | MT |
| Comments | (TFX) |
| Iem TypeSummary | G |
| Iem Magnitude | 73 |
| Iem Unit | MPH |
| Iem City | 11 W Helena |
| Iem County | Lewis and Clark |
| Iem State | MT |
| Iem Wfo | TFX |
| MergedSources | [{"id":"iem_G_46.580_-112.250_1788380880000","source":"iem","severity":"low","severityValue":25,"timestamp":1788380880000,"latitude":46.58,"longitude":-112.25}] |
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.
Want to know when something happens near Helena?
Calamity.live data shows a weather event with CalamityScore 28/100, near Helena (United States), based on data from spc. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.