Overall Orange alert Tropical Cyclone for HANNA-20
in Mexico, United States

Event summary

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

GDACS ID TC 1000685
Name HANNA-20
From - To 23 Jul - 26 Jul
Exposed countries Mexico, United States
Exposed population 920 thousand in Category 1 or higher
Maximum wind speed 148 km/h Category 1
Maximum storm surge 1.1 m (25 Jul 22:00 UTC)
Vulnerability Medium (Mexico)

GDACS Score

For more info on GDACS alert score click here.
Wind Storm surge Rainfall GDACS score
GDACS NOAA 56 km/h 1.1 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF 158 km/h 2.3 m 1282 mm 0.5
GFS 126 km/h 2.1 m 470 mm 0.5
ECMWF 115 km/h 2 m 421 mm 0.5
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
USA, Mexico - Tropical Storm HANNA (ECHO 24 Jul 2020)Fri, 24 Jul 2020 13:04

  • Tropical Storm HANNA, formed over the Gulf of Mexico and moved west-northwest towards the southern coast of Texas. On 24 July, its centre was located approximately 367 km south-west of Houma City (Louisiana State), with maximum sustained wind of 65 km/h (tropical storm).
  • HANNA is forecast to continue west-northwestward across the northwestern Gulf of Mexico, strengthening. It will make landfall along the southern Texas coast on 25 July, with maximum sustained wind up to 100 km/h.
  • On 24-25 July, heavy rain and strong wind are expected over the Gulf coast from Louisiana to southern Texas. Moderate to heavy rain is expected across the Mexican States of Coahuila, Nuevo Leon, and northern Tamaulipas.
  • A Tropical Storm Warning is in effect from the Delta of Rio Grande to San Luis Pass Texas.
USA, Gulf of Mexico - Tropical Cyclone HANNA update (ECHO 27 Jul 2020)Mon, 27 Jul 2020 13:10

  • On 25 July, HANNA made landfall on Padre Island, 53 km south-southeast of Corpus Christi City (southern Texas) as a category 1 hurricane and moved south-west towards north-east Mexico, weakening. On 27 July, its centre was located 172 km south-west of Monterrey City (Nuevo León State, Mexico), with maximum sustained wind of 45 km/h (tropical depression).
  • HANNA is forecast to weaken as it moves inland and becomes a remnant low over the next hours.
  • According to media, widespread floods have been reported over southern Texas and north-eastern Mexico. In Texas, 250,000 people remained without power and the authorities issued disaster declarations in 32 counties. 
  • Heavy rain is expected over southern Texas, northern Mexican States of Coahuila, Nuevo Leon, Tamaulipas, and Luis Potosi, and eastern Durango. Flash floods and flooding' warnings have been issued across the aforementioned States.
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)

Latest media headlines

Articles: 2025 | About casualties: 32 | Last hour: 0

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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 (38), (2), DesInventar (1), WMO (1), INFORM (2),