Severe Storm Surge ● Closed
High waves and swell — Center-west, south-west, south, south-east and center-east coasts of Madagascar.
Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.
Rough seas are affecting the coastal navigation zone between Besalampy and cape Sainte Marie, cape Sainte Marie to Toamasina due to a south to south-easterly swell. Significant wave heights will be around 2.5–3.5 m, reaching 4/5 m between Morombe and Taolagnaro.
Measurements
| Coordinates | -21.9586, 45.5239 |
|---|---|
| Region | Center-west, south-west, south, south-east and center-east coasts of Madagascar. |
| Location Precision | polygon |
| Issuing Authority | Madagascar — mg-meteo-en |
| Cap Urgency | Immediate |
| Cap Certainty | Observed |
| Cap Expires | 2026-09-11T00:00:00+03:00 |
Official source
Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.
This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.
Severity as published by WMO Alert Hub (national weather services).
View original reportThis event as JSON · API and licence
Source updated 41 days ago (Sep 8, 2026 13:56 UTC) · we last heard from WMO Alert Hub (national weather services) 37 seconds ago
On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.
Satellite view, before and after
The latest clear Sentinel-2 pass before this event and the earliest one after it.
4 Sep 2026, 4 days before this event. 1% cloud across the tile.
9 Sep 2026, the day after this event. 1.7% cloud across the tile.
The white ring marks where the event was reported.
Each image is a preview of a whole Sentinel-2 tile — an area of roughly 110 by 110 km, where one pixel is about 320 metres — not a close-up of the event, which may be a small part of it. "Clear" means under 30% cloud across the entire tile, so the exact place that matters can still be hidden. These are pictures for context, not an assessment of damage.
Contains modified Copernicus Sentinel data 2026, found through the Earth Search catalogue (Element 84) and served from the AWS Open Data Sentinel-2 archive.
Official authorities in Madagascar
If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.
More for Madagascar →What to do
Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.
Understanding surge zones, evacuation timing, and why storm surge is the deadliest part of a tropical cyclone.
Open Storm Surge Safety Guide →Nearby & related events
Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.