Overall Green alert Tropical Cyclone for HEROLD-20
in Mauritius, Madagascar

Event summary

Tropical Cyclone HEROLD-20 can have a low humanitarian impact based on the maximum sustained wind speed, exposed population and vulnerability.

GDACS ID TC 1000660
Name HEROLD-20
From - To 13 Mar - 19 Mar
Exposed countries Mauritius, Madagascar
Exposed population No people in Category 1 or higher
Maximum wind speed 185 km/h Category 3
Maximum storm surge 0.3 m (13 Mar 09:00 UTC)
Vulnerability High (Madagascar)

GDACS Score

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Wind Storm surge Rainfall GDACS score
GDACS JTWC 56 km/h 0.3 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF 205 km/h 0.7 m 1031 mm 0.5
GFS 184 km/h 0.6 m 920 mm 0.5
ECMWF 151 km/h 0.8 m 1026 mm 0.5
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
  • OpenStreetMap
    The boundaries and the names shown on this map do not imply official endorsement or acceptance by the European Union.
2000 km
Detailed event map. European Union, 2025. Map produced by EC-JRC.
The boundaries and the names shown on this map do not imply official endorsement or acceptance by the European Union.
"Mauritius - Tropical Cyclone HEROLD update "

Latest media headlines

NASA find Herold a fading ex-tropical cyclone 3/20/2020 5:48:00 PM.

IMAGE: On Mar. 20, 2020, the MODIS instrument that flies aboard NASA's Aqua satellite provided a visible image ex-tropical cyclone Herold in the Southern Indian Ocean. Credit: Credit: NASA Worldview. Former Tropical Cyclone Herold is now
...(more)
NASA finds little strength left in Tropical Cyclone Herold 3/19/2020 4:36:00 PM.

IMAGE: On March 19, 2020, the MODIS instrument that flies aboard NASA's Aqua satellite gathered infrared data on Herold. MODIS showed minimal associated strong convection (rising air that forms the thunderstorms... Credit: NASA/NRL. Wind
...(more)
NASA analyzes tropical cyclone Herold's water vapor concentration 3/18/2020 8:38:00 PM.

Credit: Credits: NASA/NRL. When NASA's Aqua satellite passed over the Southern Indian Ocean on Mar. 18, it gathered water vapor data that showed wind shear was adversely affecting Tropical Cyclone Herold. In general, wind shear is a measure
...(more)
Météo : Retour d’un anticyclone à partir de lundi 3/18/2020 5:19:00 PM.

Des rafales de 130 km/h enregistrés à Plaine-Corail. Après le passage de Herold à Maurice, qui a causé une légère baisse de la température, le soleil a refait son apparition depuis hier. La chaleur a ainsi repris ses droits et la températur
...(more)

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Data, images, links, services and documents

For this events, GDACS has links to information from the following sources: EC-JRC (38), (2), WMO (1), INFORM (2),