This alert expired on 16 March 2026 at 03:15 UTC. It is kept here as a record.
It is the 35th strongest of the 177 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 15 March 2026. 18 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Storm Warning issued March 15 at 10:07AM CDT until March 16 at 4:00PM CDT by NWS Duluth MN
An estimated 16,788 people live within 50 km of this point.
Nearby, since 15 March 2026
- September 2, 2026 · score 28 · 0.0 km
- August 9, 2026 · score 34 · 0.0 km
- August 4, 2026 · score 34 · 0.0 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 77 % 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) | 34 / 100 |
| Our confidence | 77% |
| Coordinates | 46.0000, -94.3000 |
| Nearest City | Sartell (43 km) |
| Population Exposed | 16.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-16T00:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Storm-Warning_noaa_urn-oid-2_49_0_1_840_0_5d927a3f051d4a8bc17413b60a7738b1 |
Score Breakdown
Technical Details
| Event | Storm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Grand Portage to Grand Marais MN; Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM |
| Headline | Storm Warning issued March 15 at 10:07AM CDT until March 16 at 4:00PM CDT by NWS Duluth MN |
| Expires | 2026-03-15T22:15:00-05:00 |
| SenderName | NWS Duluth MN |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5d927a3f051d4a8bc17413b60a7738b167db41e5.001.3","noaa_urn:oid:2.49.0.1.840.0.3e16dfa0bb4d85badfa6028e440201397413ebd2.001.3"] |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.