Hurricane seasons often have stretches of surprising quiet, even when forecasters predicted blockbuster activity. The 2024 Atlantic season is a perfect case study: NOAA forecast an 85% chance of an above-normal season, ocean temperatures were running 2 to 5°F above average across the tropics, and La Niña was expected to supercharge storm formation. Yet for weeks during the heart of the season, the Atlantic went eerily calm. If you searched this question during one of those lulls, you weren’t imagining things.
By the end of the year, the 2024 season actually finished above average, with 18 named storms, 11 hurricanes, and 5 major hurricanes (compared to the long-term average of 14, 7, and 3). But the activity came in bursts, with long gaps in between that left people wondering where all the storms went. Several atmospheric forces explain why.
Saharan Dust and Dry Air
One of the most powerful storm killers in the Atlantic isn’t another weather system. It’s a massive plume of dust blowing off the Sahara Desert. Known as the Saharan Air Layer, this river of dry, dusty air travels westward across the ocean at roughly the same altitudes where hurricanes need moist, rising air to grow. It attacks developing storms in three ways at once.
First, the air is extremely dry. Hurricanes feed on moisture, and when parched Saharan air gets pulled into a developing storm, it chokes off the engine. Second, embedded within that dust plume is a strong wind current that creates vertical wind shear, essentially tearing apart storms that are trying to organize. Third, the dust particles themselves appear to suppress cloud formation by inhibiting convection, the process where warm, moist air rises and condenses into the towering thunderstorms that power a hurricane. NASA researchers have described the effect as a “blanketing influence” that can outright kill tropical disturbances before they ever become named storms.
In years when Saharan dust is unusually persistent as it crosses the Atlantic, it can shut down storm development for weeks. Researchers pointed to the 2006 season as one example where a strong, sustained Saharan Air Layer likely defeated multiple disturbance waves. During 2024, similar surges of dry air helped explain stretches where the tropics looked completely dormant despite record-warm water underneath.
Wind Shear at the Wrong Time
Vertical wind shear is the difference in wind speed or direction between the lower and upper atmosphere. When shear is high, it tilts developing storms sideways, ripping apart their structure before they can become organized. Even a moderate increase in shear across the main development region (the stretch of Atlantic between Africa and the Caribbean where most hurricanes are born) can suppress activity for weeks.
During early-to-mid September 2024, a pattern of atmospheric variability driven by the Madden-Julian Oscillation, a large-scale pulse of weather that circles the tropics, created several bouts of increased wind shear across the central Atlantic. Colorado State University researchers described the resulting gap in activity as a “remarkable mid-season hurricane lull.” September is historically the peak of hurricane season, so a quiet stretch then is especially noticeable.
Why Record-Warm Water Wasn’t Enough
Sea surface temperatures in 2024 were extraordinary. Much of the central North Atlantic, Caribbean, and Gulf of Mexico sat 2 to 5°F above the 1971-2000 average. Some areas along the Gulf Stream and northern Atlantic were running as much as 9°F above normal. Vast stretches of ocean exceeded 80°F, the threshold generally needed to fuel hurricane development. NOAA described the North Atlantic as experiencing a prolonged marine heatwave.
Warm water is necessary for hurricanes, but it’s not sufficient on its own. Think of it as fuel sitting in a tank. Without the right atmospheric conditions to ignite and sustain a storm (low wind shear, moist air, a triggering disturbance), that warm water just sits there. During the 2024 lulls, the fuel was abundant, but dry Saharan air and bursts of wind shear kept snuffing out sparks before they could catch. This is why even ocean temperatures near record levels can coexist with a temporarily quiet Atlantic.
La Niña’s Delayed Arrival
One of the biggest reasons forecasters expected a hyperactive 2024 season was the anticipated shift from El Niño to La Niña in the Pacific. El Niño increases wind shear over the Atlantic, which suppresses hurricanes. La Niña does the opposite: it reduces shear and creates a more favorable environment for storm formation. NOAA estimated a 77% chance that La Niña would be in place during the season.
But La Niña was slow to develop. NOAA had flagged this timing uncertainty in its seasonal outlook, noting that a delayed transition could postpone the favorable conditions La Niña typically brings. That delay likely contributed to the mid-season quiet, as the atmosphere hadn’t yet fully shifted into the low-shear pattern that helps storms organize. When conditions finally became more favorable later in the season, activity ramped up quickly, which is why the final storm counts ended up well above average despite the extended lulls.
Hurricane Seasons Come in Bursts
It’s natural to expect hurricanes to be spread evenly across the June-through-November season, but that’s not how it works. Activity tends to cluster around favorable windows when wind shear drops, moisture surges, and tropical waves rolling off Africa happen to align. Between those windows, the Atlantic can look completely dead for two or three weeks at a time, even in historically active years.
The 2024 season illustrated this perfectly. Beryl became a powerful early-season hurricane in late June, then activity largely stalled before exploding again later. Those quiet gaps are a normal feature of even the busiest seasons, not a sign that something is wrong with the forecast. The atmosphere operates on its own schedule, and the conditions that favor or suppress storms can flip within days.
What Quiet Periods Don’t Mean
A lull in hurricane activity is never a signal that the rest of the season will stay quiet. Some of the most destructive Atlantic hurricanes on record have formed in October and November, well after people assumed the season was winding down. The factors that suppress storms, particularly Saharan dust and wind shear, tend to weaken as the season progresses into fall, which can open the door for rapid development even after weeks of inactivity.
The 2024 season is a reminder that seasonal forecasts predict total activity, not timing. A forecast calling for 17 to 25 named storms doesn’t mean those storms will arrive on a predictable schedule. They can bunch into intense clusters separated by weeks of nothing. If you’re checking the tropics and seeing a quiet map, the conditions driving that calm are temporary, and the underlying fuel (warm ocean water, favorable large-scale patterns) is still waiting.