This alert expired on 18 March 2026 at 00:00 UTC. It is kept here as a record.
It is the 15th strongest of the 126 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 56 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Heavy Freezing Spray Warning issued March 17 at 2:33PM EDT until March 17 at 3:00PM EDT by NWS Marquette MI
Nearby, since 10 March 2026
- August 9, 2026 · score 22 · 0.0 km
- August 8, 2026 · score 22 · 0.0 km
- August 7, 2026 · score 22 · 0.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 69 % 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) | 22 / 100 |
| Our confidence | 69% |
| Coordinates | 44.3000, -85.6000 |
| Nearest City | Traverse City (51 km) |
| Impact Tier | minor |
| Timestamp | 2026-03-17T18:33:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Heavy Freezing Spray Warning_noaa_urn:oid:2.49.0.1.840.0.12bb1da5173accb9147dd09e033231a4 |
Score Breakdown
Technical Details
| Event | Heavy Freezing Spray Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Marquette to Munising MI; Munising to Grand Marais MI; Grand Marais to Whitefish Point MI; Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore; Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border; Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay; Port Austin to Harbor Beach MI; Harbor Beach to Port Sanilac MI; Port Sanilac to Port Huron MI and 1 more areas |
| Headline | Heavy Freezing Spray Warning issued March 17 at 2:33PM EDT until March 17 at 3:00PM EDT by NWS Marquette MI |
| Expires | 2026-03-17T20:00:00-04:00 |
| SenderName | NWS Marquette MI |
| HasExactCoords | false |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.12bb1da5173accb9147dd09e033231a4687a5d40.001.1","noaa_urn:oid:2.49.0.1.840.0.12bb1da5173accb9147dd09e033231a4687a5d40.002.1","noaa_urn:oid:2.49.0.1.840.0.01bc92c77fac8e5df304a44a18ca13ac4fd75a1a.003.1","noaa_urn:oid:2.49.0.1.840.0.01bc92c77fac8e5df304a44a18ca13ac4fd75a1a.004.1"] |
| Iem TypeSummary | S |
| Iem Magnitude | 12.3 |
| Iem Unit | Inch |
| Iem City | 5 S Benzonia |
| Iem County | Benzie |
| Iem State | MI |
| Iem Wfo | APX |
| Iem Remark | Cocorahs station MI-BZ-1 Benzonia 5.3 S. |
| MergedSources | [{"id":"iem_S_44.230_-85.960_1773756000000","source":"iem","severity":"low","severityValue":25,"timestamp":1773756000000,"latitude":44.23,"longitude":-85.96},{"id":"iem_S_44.540_-86.110_1773752400000","source":"iem","severity":"low","severityValue":25,"timestamp":1773752400000,"latitude":44.54,"longitude":-86.11}] |
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 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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.