Right now
The most recent data we hold from NOAA arrived 8 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 11 August 2026 at 17:15 UTC. It is kept here as a record.
It is the 4th strongest of the 89 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 11 at 10:42AM CDT until August 11 at 12:15PM CDT by NWS Chicago IL
An estimated 6,539,787 people live within 50 km of this point.
Nearby, since 10 March 2026
- June 28, 2026 · score 52 · 1.6 km
- May 18, 2026 · score 52 · 2.0 km
- June 14, 2026 · score 52 · 5.6 km
How we know
Confirmed by 17 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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) | 52 / 100 |
| Our confidence | 89% |
| Coordinates | 41.8500, -87.3962 |
| Nearest City | Hyde Park (17 km) |
| Population Exposed | 6.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T15:42:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.af13166ce1709faac21eaac8cdf1419149f32509.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Winthrop Harbor to Wilmette Harbor IL; Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL; Calumet Harbor IL to Gary IN; Gary to Burns Harbor IN; Burns Harbor to Michigan City IN; 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 |
| Headline | Special Marine Warning issued August 11 at 10:42AM CDT until August 11 at 12:15PM CDT by NWS Chicago IL |
| Expires | 2026-08-11T12:15:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| Google News RssFeed | weather |
| Google News SourceName | NBC 5 Chicago |
| MergedSources | [{"id":"gnews_weather_496238_327","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786458779000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496234_328","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786445200000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496239_329","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786463330000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496238_330","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786457526000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496238_331","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786456950000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496238_332","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786459930000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496240_335","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786464962000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496240_338","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786464437000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496234_342","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786445769000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496238_345","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786460129000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496239_346","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786462020000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496240_350","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786464242000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496233_351","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786441803000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496237_359","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786456010000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496235_362","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786449380000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496240_366","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786464005000,"latitude":41.85,"longitude":-87.65}] |
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 Hyde Park?
Calamity.live data shows a weather event with CalamityScore 52/100, near Hyde Park (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.