This alert expired on 9 August 2026 at 19:30 UTC. It is kept here as a record.
It is the 19th strongest of the 207 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 16 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 9 at 1:36PM CDT until August 9 at 2:30PM CDT by NWS Chicago IL
An estimated 8,617,305 people live within 50 km of this point.
Nearby, since 10 March 2026
- March 11, 2026 · score 58 · 8.4 km
- July 3, 2026 · score 52 · 8.8 km
- March 11, 2026 · score 58 · 10.8 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 91 % 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) | 52 / 100 |
| Our confidence | 91% |
| Coordinates | 41.8652, -87.9403 |
| Nearest City | Elmhurst (4 km) |
| Population Exposed | 8.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-09T18:36:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.1a39d7cf59816daa5fc9b508d1931cf3 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | DuPage, IL; Kane, IL; Kendall, IL; Will, IL; Cook, IL; DuPage, IL |
| Headline | Severe Thunderstorm Warning issued August 9 at 1:36PM CDT until August 9 at 2:30PM CDT by NWS Chicago IL |
| Expires | 2026-08-09T14:30:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1a39d7cf59816daa5fc9b508d1931cf3ec83fa71.001.1","noaa_urn:oid:2.49.0.1.840.0.d9098f5ed8690cf8bb00f6cff06ec82508459981.002.1"] |
| Google News RssFeed | weather |
| Google News SourceName | NBC 5 Chicago |
| MergedSources | [{"id":"gnews_weather_496190_224","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786287216000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496188_230","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786279334000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_496188_232","source":"google_news","severity":"medium","severityValue":40,"timestamp":1786279334000,"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 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 52/100, near Elmhurst (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.