This alert expired on 11 July 2026 at 22:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 15 detections recorded within 20 km of this point since 12 May 2026. The last comparable one was on 7 July 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 11 at 4:10PM CDT until July 11 at 5:30PM CDT by NWS New Orleans LA
An estimated 330,931 people live within 50 km of this point.
Nearby, since 12 May 2026
- July 6, 2026 · score 43 · 8.0 km
- July 5, 2026 · score 43 · 8.0 km
- June 16, 2026 · score 37 · 9.5 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 80 % 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) | 43 / 100 |
| Our confidence | 80% |
| Coordinates | 30.1413, -90.9558 |
| Nearest City | Prairieville (18 km) |
| Population Exposed | 330.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-11T21:10:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.b84434b39b84138a57057245b830eaff |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Jefferson, LA; Orleans, LA; Iberia, LA; East Baton Rouge, LA |
| Headline | Flash Flood Warning issued July 11 at 4:10PM CDT until July 11 at 5:30PM CDT by NWS New Orleans LA |
| Expires | 2026-07-11T17:30:00-05:00 |
| SenderName | NWS New Orleans LA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b84434b39b84138a57057245b830eaffb16de48a.001.1","noaa_urn:oid:2.49.0.1.840.0.2eae6cb23f49d18cd552dfa9effb989a40d957b0.001.1","noaa_urn:oid:2.49.0.1.840.0.1fd36e7faf7fba9bbc06abda50c60e70938e26ff.001.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 Prairieville?
Calamity.live data shows a weather event with CalamityScore 43/100, near Prairieville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.