This alert expired on 17 March 2026 at 08:15 UTC. It is kept here as a record.
It is the 67th strongest of the 551 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 16 March 2026. 35 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Heavy Freezing Spray Warning issued March 16 at 7:04PM CDT until March 17 at 11:00AM CDT by NWS Milwaukee/Sullivan WI
An estimated 450,012 people live within 50 km of this point.
Nearby, since 10 March 2026
- August 13, 2026 · score 43 · 0.0 km
- August 12, 2026 · score 43 · 0.0 km
- August 9, 2026 · score 43 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 78 % 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) | 43 / 100 |
| Our confidence | 78% |
| Coordinates | 40.6000, -89.4000 |
| Nearest City | Morton (5 km) |
| Population Exposed | 450.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T00:04:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Heavy Freezing Spray Warning_noaa_urn:oid:2.49.0.1.840.0.b5909c2b973002ba5f97099719d7a1ff |
Score Breakdown
Technical Details
| Event | Heavy Freezing Spray Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.; Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake; Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake; Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake; Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake; Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake; Sheboygan to Port Washington WI; Port Washington to North Point Light WI; North Point Light to Wind Point WI; Wind Point WI to Winthrop Harbor IL |
| Headline | Heavy Freezing Spray Warning issued March 16 at 7:04PM CDT until March 17 at 11:00AM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-03-17T03:15:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b5909c2b973002ba5f97099719d7a1ff472dc5e6.002.2","noaa_urn:oid:2.49.0.1.840.0.b5909c2b973002ba5f97099719d7a1ff472dc5e6.003.2"] |
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.
Want to know when something happens near Morton?
Calamity.live data shows a weather event with CalamityScore 43/100, near Morton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.