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 11 August 2026 at 17:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 86 detections recorded within 20 km of this point since 3 April 2026. Another comparable one was recorded here earlier the same day. 17 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 11 at 12:22PM EDT until August 11 at 1:00PM EDT by NWS Northern Indiana
Urban PEI: 4,056,832 within a heuristic 50 km radius; not unique people.
Nearby, since 3 April 2026
- May 18, 2026 · score 52 · 1.0 km
- July 3, 2026 · score 48 · 4.0 km
- July 4, 2026 · score 52 · 4.0 km
How we know
16 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 41.8736, -87.0858 |
| Nearest City | Michigan City (24 km) |
| Urban exposure index (PEI) | 4.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T16:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.b26d236f1da84ccb586ff9f88e1c7f7c |
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: 2026-08-11T16:22:00.000Z.
First archived: 2026-08-11T16:59:38.322Z. 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 | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | New Buffalo MI to St Joseph MI; Michigan City IN to New Buffalo MI; Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.; 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 12:22PM EDT until August 11 at 1:00PM EDT by NWS Northern Indiana |
| Expires | 2026-08-11T13:00:00-04:00 |
| SenderName | NWS Northern Indiana |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b26d236f1da84ccb586ff9f88e1c7f7c32dfe683.001.1","noaa_urn:oid:2.49.0.1.840.0.af13166ce1709faac21eaac8cdf1419149f32509.001.1"] |
| 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_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.
Review the area, threshold and delivery channel in your account.
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