3.1.5.5 - Two contrasting recent tropical storms

Two events with different settings

The comparison uses named storms and dated geographical units, rather than treating every affected place as having the same experience.

Helene made landfall in Florida's Big Bend at about 03:10 UTC on 27 September 2024 as a Category 4 hurricane with maximum sustained winds of 120 knots. Its effects extended into the southern Appalachians. Freddy crossed the southwest Indian Ocean and made repeated landfalls; after its second Mozambique landfall on 11 March 2023, its remnants brought destructive rain to southern Malawi. Malawi's disaster was inland rainfall, flooding and debris flows, not a coastal landfall there. NHC Helene report, revised February 2026, WMO Freddy review, July 2024.

WMO verified 36 days at tropical-storm strength or above for Freddy, excluding intervals below that strength. This is not 36 continuous days at its peak wind. Helene's landfall wind and Freddy's qualifying duration measure different characteristics and cannot rank total disaster risk on one scale.

The USA has substantial forecasting, transport and reconstruction resources, but these are unevenly accessible. Mozambique and Malawi faced more constrained services and resources in many affected communities; Malawi also had an existing cholera emergency. Such contrasts help explain capacity, without assuming every American household is secure or every African community responds in the same way. Compare mechanisms and local conditions before using national development as an explanation.

Helene: coastal damage and inland disruption

Helene produced destructive coastal surge and an inland freshwater disaster, with cascading consequences for services and livelihoods.

The NHC report records surge inundation of 12–16 feet above ground level along part of the coast near Keaton Beach and Steinhatchee. In the Appalachians, preceding rainfall helped prime catchments before Helene's rain, increasing flood and landslide hazard. Damage included roads, homes, trees and water infrastructure. The revised report gives at least 250 US deaths, including at least 175 direct deaths, and an estimated US$78.7 billion in damage. The totals are national event estimates, not Asheville-only figures. NHC report.

Environmental damage included slope failure and debris movement; social impacts included deaths, isolation and interrupted safe water. Destroyed premises and transport links caused economic disruption beyond physical asset losses. Political responsibilities included warning, rescue, service restoration and decisions about reconstruction assistance. These categories overlap: damage to a public water system creates an environmental health concern, a household burden and a governance problem.

Evacuation provides a bounded response example. NHC reported high evacuation rates and no reported surge deaths in Keaton Beach and Steinhatchee, despite very severe building losses. This supports a local life-protection benefit; it does not show that evacuation prevented property destruction or worked equally everywhere. Inland rescue and access remained difficult where flood and landslide damage severed routes.

Asheville's December 2024 utility notice records the system-wide boil-water notice lifted on 18 November 2024 and billing resuming afterwards. Restored potable water is an achieved recovery milestone after prolonged disruption. It does not establish full housing or livelihood recovery. North Carolina's recovery action plan sets out assistance intentions; a planned programme should be judged later against delivery and outcomes.

Freddy: flooding, access and a compound emergency

Freddy's rain interacted with steep terrain, exposed settlements and an existing health emergency, creating consequences that continued after the circulation weakened.