This alert expired on 14 March 2026 at 03:00 UTC. It is kept here as a record.
It is the 16th strongest of the 130 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 11 March 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Storm Warning issued March 13 at 2:57PM EDT until March 13 at 11:00PM EDT by NWS Grand Rapids MI
Nearby, since 10 March 2026
- September 3, 2026 · score 28 · 0.0 km
- August 9, 2026 · score 22 · 0.0 km
- August 8, 2026 · score 22 · 0.0 km
How we know
Confirmed by 12 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % 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) | 22 / 100 |
| Our confidence | 70% |
| Coordinates | 44.3000, -85.6000 |
| Nearest City | Traverse City (51 km) |
| Impact Tier | minor |
| Timestamp | 2026-03-13T18:57:00.000Z |
| Source | https://api.weather.gov/alerts/urn-oid-2_49_0_1_840_0_e0096f3159fcaee080303bea4e5b24c9e2d82420_002_1 |
Score Breakdown
Technical Details
| Event | Storm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | St Joseph to South Haven MI; South Haven to Holland MI; Holland to Grand Haven MI; Grand Haven to Whitehall MI; Whitehall to Pentwater MI |
| Headline | Storm Warning issued March 13 at 2:57PM EDT until March 13 at 11:00PM EDT by NWS Grand Rapids MI |
| Expires | 2026-03-13T23:00:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | false |
| Iem TypeSummary | S |
| Iem Magnitude | 6.5 |
| Iem Unit | Inch |
| Iem City | 3 E Grawn |
| Iem County | Grand Traverse |
| Iem State | MI |
| Iem Wfo | APX |
| Iem Remark | Wet, dense, snow. |
| MergedSources | [{"id":"iem_S_44.230_-85.960_1773410400000","source":"iem","severity":"low","severityValue":25,"timestamp":1773410400000,"latitude":44.23,"longitude":-85.96},{"id":"iem_N_44.270_-86.250_1773432120000","source":"iem","severity":"low","severityValue":25,"timestamp":1773432120000,"latitude":44.27,"longitude":-86.25},{"id":"iem_S_44.540_-86.110_1773406800000","source":"iem","severity":"low","severityValue":25,"timestamp":1773406800000,"latitude":44.54,"longitude":-86.11},{"id":"iem_N_44.790_-85.630_1773434460000","source":"iem","severity":"low","severityValue":25,"timestamp":1773434460000,"latitude":44.79,"longitude":-85.63},{"id":"iem_N_44.630_-86.250_1773431040000","source":"iem","severity":"low","severityValue":25,"timestamp":1773431040000,"latitude":44.63,"longitude":-86.25},{"id":"iem_S_44.730_-85.840_1773424800000","source":"iem","severity":"low","severityValue":25,"timestamp":1773424800000,"latitude":44.73,"longitude":-85.84},{"id":"iem_S_44.340_-85.300_1773425700000","source":"iem","severity":"low","severityValue":25,"timestamp":1773425700000,"latitude":44.34,"longitude":-85.3},{"id":"iem_N_44.630_-86.200_1773433980000","source":"iem","severity":"low","severityValue":25,"timestamp":1773433980000,"latitude":44.63,"longitude":-86.2},{"id":"iem_S_44.230_-86.060_1773441000000","source":"iem","severity":"low","severityValue":25,"timestamp":1773441000000,"latitude":44.23,"longitude":-86.06},{"id":"iem_N_44.730_-85.570_1773434520000","source":"iem","severity":"low","severityValue":25,"timestamp":1773434520000,"latitude":44.73,"longitude":-85.57},{"id":"iem_S_44.670_-85.620_1773412200000","source":"iem","severity":"low","severityValue":25,"timestamp":1773412200000,"latitude":44.67,"longitude":-85.62}] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.