Overall Green alert Tropical Cyclone for HENRI-21
in United States

Event summary

Tropical Cyclone HENRI-21 can have a low humanitarian impact based on the maximum sustained wind speed, exposed population and vulnerability.

GDACS ID TC 1000815
Name HENRI-21
From - To 16 Aug - 23 Aug
Exposed countries United States
Exposed population 90 thousand in Category 1 or higher
Maximum wind speed 120 km/h Category 1
Maximum storm surge 1 m (22 Aug 16:00 UTC)
Vulnerability Low (United States)


For more info on GDACS alert score click here.
Wind Storm surge Rainfall GDACS score
GDACS NOAA 46 km/h 1 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF 166 km/h 0.8 m 488 mm 0.5
GFS 126 km/h 0.7 m 810 mm 0.5
ECMWF 58 km/h 0.6 m 351 mm 0.5
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
USA - Tropical Depression HENRI (ECHO 23 Aug 2021)Mon, 23 Aug 2021 16:33

  • After making landfall in an area at the border between Rhode Island and Connecticut States in the afternoon of 22 August, tropical cyclone HENRI has weakened to a tropical depression as it moves north overland. On 23 August at 3.00 UTC, its centre was located about 40 km north-west of Hartford City (Wisconsin), and 55 km south-west of Springfield (Illinois), with maximum sustained winds of 45 km/h. 
  • A State of Emergency was declared for Rhode Island and 36 people in Connecticut have been displaced to evacuation shelters, as reported by the US Federal Emergency Management Agency (FEMA).
  • On the midday of 23 August, HENRI is forecast to turn eastwards and move across Massachusetts State, as a tropical depression. Then it is expected to reach the North Atlantic Ocean and further dissipate on 24 August.
  • A flood warning has been issued for Hartford City, while over the next 24 hours, moderate to heavy rain is forecast over the north-eastern USA.
Detailed event map. European Union, 2024. 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.

Updates on volcanic activity (Smithsonian)

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Estimated casualties (PAGER)

USGS estimates the number of casualties for each earthquake for the Prompt Assessment of Global Earthquakes for Response (PAGER) product.
The graph shows the current fatalities estimate.

Exposed population

Data, images, links, services and documents

For this events, GDACS has links to information from the following sources: EC-JRC (40), (2), WMO (1), INFORM (2),