Overall Orange alert Tropical Cyclone for IDALIA-23
in United States

Event summary

Tropical Cyclone IDALIA-23 can have a medium humanitarian impact based on the maximum sustained wind speed, exposed population and vulnerability.

GDACS ID TC 1001000
Name IDALIA-23
From - To 26 Aug - 02 Sep
Exposed countries United States
Exposed population 470 thousand in Category 1 or higher
Maximum wind speed 213 km/h Category 4
Maximum storm surge 2.4 m (30 Aug 10:00 UTC)
Vulnerability Low (United States)

GDACS Score

For more info on GDACS alert score click here.
Wind Storm surge Rainfall GDACS score
GDACS NOAA 93 km/h 2.4 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF 220 km/h 3.2 m 1433 mm 0.5
GFS 166 km/h n.a. 816 mm 0.5
ECMWF 112 km/h 2.6 m 647 mm 0.5
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
USA, Cuba - Tropical cyclone IDALIA (ECHO 28 Aug 2023)Mon, 28 Aug 2023 10:15

  • A new tropical cyclone named IDALIA formed over the western Caribbean Sea on 26 August and started moving north toward the western Cuba and north-western Florida (USA). On 28 August at 6.00 UTC its centre was located over the sea approximately 260 km south-west of the westernmost part of Cuba, with maximum sustained winds of 95 km/h (tropical storm).
  • Western Cuba could see 8 to 15 cm of rain, with isolated amounts up to 25 cm.
  • On the forecast track, IDALIA is expected to continue moving north-east, strenghtening, and to make landfall over north-western Florida on 30 August late in the morning (UTC), with maximum sustained winds up to 175 km/h (Cat. 2 Hurricane).
  • Heavy rainfall, strong winds and storm surges are forecast over northern and western Florida on 29-30 August. The Governor of Florida declared a state of emergecny over 33 Counties across the area, according to FEMA, as of 27 August.
United States, Cuba - Tropical cyclone IDALIA, update (ECHO 29 Aug 2023)Tue, 29 Aug 2023 10:10

  • Tropical cyclone IDALIA continued moving over the northern Caribbean Sea on 28 August, towards the far western Cuba, and entered into the Gulf of Mexico. On 29 August at 6.00 UTC, its centre was located over the sea approximately 50 km west of the westernmost part of Cuba, with maximum sustained winds of 110 km/h (tropical storm).
  • On the forecast track, IDALIA is expected to continue moving north-east, strenghthening, and to make landfall over north-western Florida on 30 August early in the afternoon (UTC), with maximum sustained winds up to 195 km/h (Cat. 3 Hurricane).
  • Heavy rainfall, strong winds and storm surges are forecast over the whole Florida Gulf Coast and the westernmost part of Cuba on 29-30 August. NOAA has issued a hurricane warning for the interested coast of Florida and a tropical storm warning for the western coast of Cuba.
  • The state of emergency declared from the Government of Florida on 27 August is still in force.
United States - Tropical cyclone IDALIA, update (ECHO 31 Aug 2023)Thu, 31 Aug 2023 10:51

  • Tropical cyclone IDALIA made landfall over north-western Florida as a category 3 hurricane on 30 August in the morning, and crossed north-east over Georgia and southern South Carolina, weakening as a tropical storm. On 31 August at 6.00 UTC, its centre was located inland approximately 30 km south-west of Myrtle Beach in South Carolina, with maximum sustained winds of 95 km/h.
  • Media reported two deaths in Florida and one in Georgia. Some 470,000 people in Georgia and Florida were without power, and several flights have been cancelled. According to the Federal Emergency Management Agency, as of 30 August, almost 5,000 people have been sheltered in Florida.
  • IDALIA will move close to the coast of South Carolina and then just offshore from North Carolina on 31 August, after which it will move over the western Atlantic on 1-2 September, dissipating. 
  • For the next 24 hours, heavy rainfall and strong winds are expected over central Florida, South Carolina and eastern North Carolina. A Tropical Storm Warning is in effect for parts of North Carolina close to the Virginia border.
IDALIA-23 - EC/ECHO daily mapThu, 31 Aug 2023 18:00

A new EC/ECHO daily map is now available
United States, Bermuda - Tropical cyclone IDALIA, update (ECHO 01 Sep 2023)Fri, 01 Sep 2023 10:10

  • After its landfall over north-western Florida on 30 August, Cat. 3 Hurricane IDALIA continued moving north-east inland over eastern Georgia and the coast of South Carolina, weakening, on 30-31 August. On 1 September at 6.00 UTC its centre was located over the North Atlantic Ocean well off the coast of the Carolinas and 450 km west of Bermuda, with maximum sustained winds of 100 km/h (tropical storm).
  • The Federal Emergency Management Agency (FEMA) reports as of 31 August three fatalities, of which two in Florida and one more in Georgia. FEMA also reports 4,924 evacuated people in 114 shelters across Florida and four evacuated people in one shelter in Georgia. Mandatory evacuation orders are still in force for 11 Counties in Florida and some areas across Georgia.
  • IDALIA is expected to continue moving west over the Ocean, further weakening, and to pass near Bermuda (approximately 100 km south) on 3 September early in the morning (UTC), with maximum sustained winds up to 75 km/h.
  • Over the next 24 hours, moderate rainfall and winds are still forecast over eastern North Carolina. 
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

Tropical Storm Lee Expected To Become A Major Hurricane; Meteorologist.. 9/6/2023 11:17:00 AM.

The National Hurricane Center and Central Pacific Hurricane Center said that Lee is expected to rapidly intensify into an extremely dangerous hurricane by the weekend. Path of the tropical storm. Meteorologists said that at 11:00 PM AST (03
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ALLISTER AALDERS: Idalia remnants offshore, feeling summer-like this w.. 9/6/2023 11:15:00 AM.

Idalia’s remnants are offshore but will influence our weather through the end of this week, mainly in Nova Scotia, along with Newfoundland and Labrador. We had some excellent weather for the last long weekend of summer — the weekend some
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‘Increasing confidence’ that Lee will become ‘very powerful hurricane’.. 9/6/2023 11:12:00 AM.

Tropical Storm Lee is gaining strength in the Atlantic and likely will develop into an “extremely dangerous” major hurricane with potential top wind speeds of 150 mph by the weekend as it travels west toward the Caribbean and Bahamas, forec
...(more)
‘Increasing confidence’ that Lee will become ‘very powerful hurricane’.. 9/6/2023 11:10:00 AM.

Tropical Storm Lee is gaining strength in the Atlantic and likely will develop into an “extremely dangerous” major hurricane with potential top wind speeds of 150 mph by the weekend as it travels west toward the Caribbean and Bahamas, forec
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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),