This alert expired on 25 May 2026 at 17:30 UTC. It is kept here as a record.
It is the 27th strongest of the 68 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 12 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 25 at 10:42AM CDT until May 25 at 12:30PM CDT by NWS New Orleans LA
An estimated 448,593 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 11, 2026 · score 48 · 3.1 km
- June 18, 2026 · score 72 · 4.6 km
- May 9, 2026 · score 48 · 7.1 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 91% |
| Coordinates | 30.2611, -89.7279 |
| Nearest City | Slidell (5 km) |
| Population Exposed | 448.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-25T15:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.9717a43a1fe3ebd6e86ebb2af718e784 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Jefferson, LA; Orleans, LA; St. Bernard, LA; Hancock, MS; Harrison, MS |
| Headline | Flash Flood Warning issued May 25 at 10:42AM CDT until May 25 at 12:30PM CDT by NWS New Orleans LA |
| Expires | 2026-05-25T12:30:00-05:00 |
| SenderName | NWS New Orleans LA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9717a43a1fe3ebd6e86ebb2af718e78421b581c7.001.1","noaa_urn:oid:2.49.0.1.840.0.884c39f914718fd7e3841ae7525672aad8e6cadf.001.1"] |
| Iem TypeSummary | F |
| Iem City | 4 SW East New Orleans |
| Iem County | Orleans |
| Iem State | LA |
| Iem Wfo | LIX |
| Iem Remark | Street flooding along Old Gentilly Rd according to Streetwise NOLA. |
| MergedSources | [{"id":"iem_F_30.040_-89.990_1779721800000","source":"iem","severity":"low","severityValue":25,"timestamp":1779721800000,"latitude":30.04,"longitude":-89.99},{"id":"iem_F_29.970_-90.110_1779721500000","source":"iem","severity":"low","severityValue":25,"timestamp":1779721500000,"latitude":29.97,"longitude":-90.11},{"id":"iem_F_29.950_-90.140_1779721560000","source":"iem","severity":"low","severityValue":25,"timestamp":1779721560000,"latitude":29.95,"longitude":-90.14},{"id":"iem_F_30.010_-89.970_1779721860000","source":"iem","severity":"low","severityValue":25,"timestamp":1779721860000,"latitude":30.01,"longitude":-89.97}] |
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.
Calamity.live data shows a weather event with CalamityScore 43/100, near Slidell (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.