This alert expired on 11 August 2026 at 15:15 UTC. It is kept here as a record.
It is the 7th strongest of the 45 detections recorded within 20 km of this point since 31 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 9:28AM CDT until August 11 at 10:15AM CDT by NWS Quad Cities IA IL
An estimated 522,924 people live within 50 km of this point.
Nearby, since 31 March 2026
- August 10, 2026 · score 52 · 12.4 km
- July 4, 2026 · score 48 · 13.8 km
- July 3, 2026 · score 46 · 19.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 81 % 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) | 48 / 100 |
| Our confidence | 81% |
| Coordinates | 41.7891, -88.7881 |
| Nearest City | DeKalb (16 km) |
| Population Exposed | 522.9K within 50 km |
| Impact Tier | significant |
| Date | 2026-08-11 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.7a553d4f15feb7c03e6b466339e555d4 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Bureau, IL; Boone, IL; De Kalb, IL; La Salle, IL; Whiteside, IL and 5 more areas |
| Headline | Severe Thunderstorm Warning issued August 11 at 9:28AM CDT until August 11 at 10:15AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-08-11T10:15:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7a553d4f15feb7c03e6b466339e555d4a9018faf.002.1","noaa_urn:oid:2.49.0.1.840.0.93f7443ff39dd75844c1da31674ca1622f39f31a.001.1","noaa_urn:oid:2.49.0.1.840.0.68a14c38d876ae0f6799ac16b4f986c8c9e70954.002.1","noaa_urn:oid:2.49.0.1.840.0.6fe03f43545036b97efb4b6065da2a2264f0ac7e.002.1","noaa_urn:oid:2.49.0.1.840.0.5425df02f2f52a2f46570b315a6143b3743ec591.001.1","noaa_urn:oid:2.49.0.1.840.0.f1646ff304ac05aafdac5fb168afb64053d1a0b2.001.1","noaa_urn:oid:2.49.0.1.840.0.d780344ae69e40db6261b13882c7e187617fc078.002.1","noaa_urn:oid:2.49.0.1.840.0.7688a7860ebcb71ddbf048725f32b54e19f1d5a6.001.1"] |
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.
Want to know when something happens near DeKalb?
Calamity.live data shows a weather event with CalamityScore 48/100, near DeKalb (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.