Right now
The most recent data we hold from NOAA arrived 20 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 17 March 2026 at 02:45 UTC. It is kept here as a record.
It is the 17th strongest of the 130 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 41 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Heavy Freezing Spray Warning issued March 16 at 10:32AM EDT until March 17 at 2:00PM 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
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.58/1 |
| Coordinates | 44.3000, -85.6000 |
| Nearest City | Traverse City (51 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-03-16T18:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Heavy Freezing Spray Warning_noaa_urn:oid:2.49.0.1.840.0.f2263c956dc51e6632be12b6ba90db6d |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-03-16T18:00:00.000Z.
First archived: 2026-03-16T16:47:59.055Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Heavy Freezing Spray Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Saxon Harbor WI to Black River MI; Black River To Ontonagon MI; Ontonagon to Upper Entrance of Portage Canal MI; Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park; Seul Choix Point to Point Detour MI; 5NM East of a line from Fairport MI to Rock Island Passage; Upper Entrance of Portage Canal to Eagle River MI; Eagle River to Manitou Island MI; Manitou Island to Point Isabelle MI; Point Isabelle to Lower Entrance of Portage Canal MI; Portage Lake to Huron Island MI to Lower Entrance of Portage Canal To Huron Islands MI Including Keweenaw and Huron Bays; Huron Islands to Marquette MI; Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border; Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore and 7 more areas |
| Headline | Heavy Freezing Spray Warning issued March 16 at 10:32AM EDT until March 17 at 2:00PM EDT by NWS Marquette MI |
| Expires | 2026-03-16T22:45:00-04:00 |
| SenderName | NWS Marquette MI |
| HasExactCoords | false |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f2263c956dc51e6632be12b6ba90db6da887d88d.001.2","noaa_urn:oid:2.49.0.1.840.0.f2263c956dc51e6632be12b6ba90db6da887d88d.002.2","noaa_urn:oid:2.49.0.1.840.0.f2263c956dc51e6632be12b6ba90db6da887d88d.004.2","noaa_urn:oid:2.49.0.1.840.0.f2263c956dc51e6632be12b6ba90db6da887d88d.005.2","noaa_urn:oid:2.49.0.1.840.0.b1145e4ac72135c79410bf436970a63614f5cd64.001.2","noaa_urn:oid:2.49.0.1.840.0.b1145e4ac72135c79410bf436970a63614f5cd64.003.2","noaa_urn:oid:2.49.0.1.840.0.b1145e4ac72135c79410bf436970a63614f5cd64.002.2","noaa_urn:oid:2.49.0.1.840.0.a4278cf38a69ad83b701252211b518a062dd8160.001.3","noaa_urn:oid:2.49.0.1.840.0.a4278cf38a69ad83b701252211b518a062dd8160.002.2","noaa_urn:oid:2.49.0.1.840.0.bb92f9ee5c72e3e91fddb665fc18fedfba045e4e.001.2"] |
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.
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