Meteorologists and climate researchers issued an unusually stark warning on May 13, 2024, several weeks before the formal start of the hurricane season, cautioning that the months ahead could produce one of the most active hurricane seasons ever recorded. Their outlook, drawn from an alignment of oceanic, atmospheric, and climatic signals that specialists described as "highly conducive" to tropical cyclone development, has prompted emergency managers across the region to move preparations forward and has renewed a long-running conversation about how communities and infrastructure are adapting to an increasingly dangerous climate.

Regional and national forecasting centres, along with several university research groups, coordinated the release of their seasonal outlooks to underscore the severity of the message. Collectively, their forecasts anticipate a total number of named storms, hurricanes, and major hurricanes well above the long-term average — and in several forecasts, at levels approaching or exceeding the record-breaking seasons of recent memory.

The Ingredients of an Extreme Season

Forecasters pointed to a combination of factors that have rarely, if ever, aligned so strongly in favour of an active season. Chief among them is record-warm sea surface temperature across the tropical ocean basin from which most of the region's hurricanes emerge. Waters in the so-called "main development region" have been running more than a full degree Celsius above the long-term average since the start of the year — an anomaly that meteorologists described as both "exceptional" and "persistent."

Warm ocean water is the primary fuel source for hurricanes. The more heat stored in the upper layer of the ocean, and the deeper that warm layer extends, the more energy is available to hurricanes that track through it. In years past, hurricane intensity has often been moderated by cooler pockets of water, upwelled as storms passed over the same area. This year, those moderating effects are expected to be substantially reduced.

Atmospheric conditions are also unfavourable to storm suppression. Vertical wind shear — the change in wind speed and direction with altitude, which tends to disrupt developing cyclones — is forecast to remain weak across much of the basin. Meanwhile, the large-scale climate pattern known as El Niño–Southern Oscillation, which has historically modulated seasonal storm counts, is expected to shift toward a neutral or La Niña-leaning state, further reducing natural brakes on storm development.

"What we are looking at is an almost perfect storm of storm-favourable conditions," a senior forecaster at a major regional prediction centre said at a joint press briefing. "Every one of the key ingredients we look at is pointing in the same direction. That does not guarantee a record season, but it does mean that residents, businesses, and governments need to prepare as if one is coming."

What the Forecasts Actually Say

Forecasts for the season ahead vary in the specific numbers they report, but the range they cover is itself telling. The most conservative outlook anticipates a season with roughly 20 named storms, 10 hurricanes, and 4 major hurricanes (Category 3 or above). The most aggressive outlooks project as many as 25 named storms, 13 hurricanes, and 6 or 7 major hurricanes. The long-term average, by comparison, is closer to 14 named storms, 7 hurricanes, and 3 major hurricanes per season.

Forecasters emphasised that the seasonal number of storms, while informative, is not the most important metric for individual communities. What matters for any given coastal town or inland community is whether a storm reaches them — and at what intensity. A season of many weak storms may produce less damage than a season of few but extremely powerful ones.

For that reason, the outlook also included forecasts of "accumulated cyclone energy" — a measure that captures the combined intensity and duration of all storms in a season — which is projected to run at or near record levels. Rapid intensification events, in which a storm's maximum sustained winds increase by at least 55 km/h within 24 hours, are also expected to occur more frequently than in a typical season, adding to the challenge of forecasting and evacuation.

The Climate Connection

Climate researchers speaking alongside forecasters were careful to distinguish between seasonal variability, which has always existed, and long-term trends, which they said have become increasingly difficult to ignore. Every individual season is shaped by a mixture of short-term signals — ocean currents, atmospheric patterns, volcanic eruptions — and longer-term climate conditions. The current seasonal outlook is unusual, but the background conditions against which this season will unfold have been trending in a concerning direction for decades.

Sea surface temperatures across much of the world's tropical oceans have been rising steadily. The fraction of hurricanes that reach major-storm intensity has trended upward. The proportion of storms undergoing rapid intensification has also increased. And the amount of rainfall delivered by a given storm has grown, a direct consequence of a warmer atmosphere's greater moisture-holding capacity.

"Any single hurricane is the product of many factors, most of them chaotic," one of the research leads explained. "But when we look at whole seasons, decades of seasons, we can see the fingerprints of a changing climate in the statistics. The outlook for this season is unusual. The conditions giving rise to it, increasingly, are not."

Emergency Management Moves Early

Across the region, emergency management agencies have moved to accelerate their preparations in response to the outlook. Storm-readiness exercises that would normally be conducted in late spring have been rescheduled earlier, pre-season meetings with utility companies and transportation agencies have been expanded, and stockpiles of food, water, medical supplies, and emergency equipment are being reviewed and replenished ahead of typical timelines.

Mutual-aid agreements between agencies and between regions are being re-examined, and many jurisdictions are conducting audits of their evacuation plans. Particular attention has been paid to assisted evacuation needs — residents who rely on oxygen, dialysis, or other life-supporting medical equipment, and who require specialised transport and destination planning.

Utility companies and grid operators, whose infrastructure is often the most visible casualty of a major storm, are holding pre-season drills and conducting physical inspections of the most storm-vulnerable assets. Coastal defence agencies are completing off-season maintenance on seawalls, drainage systems, and pumping stations.

Insurance industry officials, participating in several of the same briefings, confirmed that reinsurance costs had continued to rise ahead of the season and urged residents and businesses to review their policies, particularly with regard to flood and wind coverage, which in many cases require specific additional policies.

A Message to Residents

Public messaging around the outlook has been unusually direct. Residents of hurricane-prone areas were urged to treat the season ahead with the seriousness it demands: to have family emergency plans in place; to assemble or update emergency kits; to review evacuation routes; to consider home-hardening measures such as reinforced garage doors, impact-resistant windows, and roof strapping; and to ensure that important documents, medications, and backup communication tools are accessible in the event of a rapid evacuation.

Officials also emphasised that a single storm is enough to turn any year into the "worst year" for a given community, regardless of what the season looks like overall. A season with twenty named storms may produce no landfalls at a particular location, while a below-average season may still deliver a direct hit.

"Season forecasts inform what governments, utilities, insurers, and emergency agencies do before anything has started to move," a regional emergency director said. "But for individual families, the preparation that matters is always the preparation you make for the storm that reaches you — not the storms that don't."

Weeks to Act

With the formal start of the hurricane season only weeks away, and with the earliest named storms of past seasons sometimes forming in advance of that date, the window for unhurried preparation is closing. Forecasters reiterated that their outlook reflected probabilities, not certainties, and that the single storm that reshapes a community cannot always be predicted months in advance.

But they were unanimous in their message: the signals in the ocean, in the atmosphere, and in the climate are telling the same story, and the prudent response is to prepare for a season that, if the outlook is right, will ask more of the region than any that has come before. Whether the season ultimately breaks records or falls short of the forecasts, the work being done now — by agencies, utilities, businesses, and households — is the work that will determine how communities fare when the first major storm, as it eventually will, arrives at the coast.