Reported by SPC today.
It is the 9th strongest of the 28 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 23 August 2026.
What the source measured
SPC reported: Wind UNK kt near Martinsburg, Blair, PA. Tree down across West Allegheny Street at the 428 block. (CTP)
An estimated 45,344 people live within 50 km of this point.
Nearby, since 11 March 2026
- June 6, 2026 · score 39 · 6.4 km
- March 12, 2026 · score 39 · 11.9 km
- March 11, 2026 · score 45 · 16.5 km
How we know
Confirmed by 2 independent sources, including SPC.
Our own score for this event is 28 out of 100, at 80 % 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 | 80% |
| Coordinates | 40.3100, -78.3300 |
| Nearest City | Altoona (24 km) |
| Population Exposed | 45.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T15:18:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Score Breakdown
Technical Details
| ReportType | wind |
| Speed | UNK |
| Location | Martinsburg |
| County | Blair |
| State | PA |
| Comments | Tree down across West Allegheny Street at the 428 block. (CTP) |
| Iem TypeSummary | D |
| Iem City | Martinsburg |
| Iem County | Blair |
| Iem State | PA |
| Iem Wfo | CTP |
| Iem Remark | Tree down across West Allegheny Street at the 428 block. |
| MergedSources | [{"id":"iem_D_40.310_-78.330_1788362280000","source":"iem","severity":"low","severityValue":25,"timestamp":1788362280000,"latitude":40.31,"longitude":-78.33}] |
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 Altoona?
Calamity.live data shows a weather event with CalamityScore 28/100, near Altoona (United States), based on data from spc. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.