This alert expired on 23 May 2026 at 00:30 UTC. It is kept here as a record.
No stronger detection stands among the 37 recorded within 20 km of this point since 16 March 2026 — 27 others scored the same. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 22 at 7:21PM CDT until May 22 at 7:30PM CDT by NWS New Orleans LA
An estimated 262,709 people live within 50 km of this point.
Nearby, since 16 March 2026
- May 9, 2026 · score 43 · 4.4 km
- July 21, 2026 · score 43 · 4.9 km
- May 24, 2026 · score 43 · 5.6 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 89 % 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 | 89% |
| Coordinates | 30.2040, -88.7970 |
| Nearest City | Ocean Springs (23 km) |
| Population Exposed | 262.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-23T00:21:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.fd44347a92068e861b11960391dfd39d |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake Pontchartrain; Chandeleur Sound; Coastal waters from Pascagoula Mississippi to Stake Island out 20 NM; South Mobile Bay; Mississippi Sound; Perdido Bay Area; Coastal waters from Pensacola FL to Pascagoula MS out 20 NM |
| Headline | Special Marine Warning issued May 22 at 7:21PM CDT until May 22 at 7:30PM CDT by NWS New Orleans LA |
| Expires | 2026-05-22T19:30:00-05:00 |
| SenderName | NWS New Orleans LA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.fd44347a92068e861b11960391dfd39d62a4e602.001.1","noaa_urn:oid:2.49.0.1.840.0.72c8608c29276cc55f1dc60210ffc85f61b187b5.002.1","noaa_urn:oid:2.49.0.1.840.0.636c5d722d26f8da36470cf9abaae2e5b3336deb.001.1"] |
| Iem TypeSummary | F |
| Iem City | 2 SW Gulfport |
| Iem County | Harrison |
| Iem State | MS |
| Iem Wfo | LIX |
| Iem Remark | Intersection of Hwy 90 and 20th Ave flooded according to Harrison SO. |
| MergedSources | [{"id":"iem_F_30.380_-89.060_1779476880000","source":"iem","severity":"low","severityValue":25,"timestamp":1779476880000,"latitude":30.38,"longitude":-89.06},{"id":"iem_M_30.210_-88.980_1779489360000","source":"iem","severity":"low","severityValue":25,"timestamp":1779489360000,"latitude":30.21,"longitude":-88.98},{"id":"iem_F_30.370_-89.090_1779476580000","source":"iem","severity":"low","severityValue":25,"timestamp":1779476580000,"latitude":30.37,"longitude":-89.09}] |
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 43/100, near Ocean Springs (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.