9/24/2026
# How climate patterns can influence disaster seasons
Disaster seasons do not happen in a vacuum. Year to year, large-scale climate patterns can shift the odds of certain hazards becoming more or less likely. That does not mean a disaster will happen in a specific place, or that one pattern causes one outcome every time. It simply means the background conditions can nudge weather and hazard seasons in different directions.
Understanding those patterns can help people make sense of why some years feel busier than others for storms, heat, drought, flooding, or wildfire risk. It can also help families and communities stay flexible, prepared, and alert to local official guidance.
The big idea: patterns shape probabilities
Climate patterns are broad, repeating changes in the ocean and atmosphere. They can influence:
Where storms tend to form
- How much rain or snow an area may receive over a season
- Whether some regions are more likely to see warm, dry, or wet periods
- How long a hazard season may feel in practice
These patterns are best understood as part of a larger picture. Local geography, land use, elevation, coastlines, and timing all matter too. A climate pattern can tilt the odds, but it does not replace local conditions.
El Niño and La Niña: two familiar examples
One of the most discussed climate patterns is the El Niño–Southern Oscillation, often shortened to ENSO. It has two main phases:
El Niño: When some parts of the tropical Pacific are warmer than average
- La Niña: When some parts of the tropical Pacific are cooler than average
These shifts can affect weather patterns far beyond the Pacific. Depending on the region and season, they may influence rainfall, temperature, storm tracks, and the likelihood of certain hazards.
A few general examples:
One phase may be associated with wetter-than-average conditions in some places and drier-than-average conditions in others
- One phase may be associated with warmer or cooler seasonal temperatures in certain regions
- One phase can sometimes affect the timing or intensity of some storm seasons
The important point is that these are broad tendencies, not guarantees. The same pattern can produce very different results from one region to another.
Ocean temperatures matter more than many people realize
The ocean stores and moves heat. When ocean temperatures shift, they can change how much energy and moisture are available to the atmosphere. That can influence:
Tropical storm development
- Seasonal rainfall patterns
- Heat in nearby coastal areas
- The persistence of dry or wet conditions
Warmer ocean waters do not mean a specific disaster will occur, and cooler waters do not prevent all hazards. But ocean conditions can be one of the background ingredients that help shape a season.
For people thinking about preparedness, the key lesson is simple: coastal and inland hazards can both be influenced by ocean conditions, even when the effects are indirect.
Drought cycles can build risk over time
Drought is often thought of as a lack of rain, but it is more than that. Drought can develop when below-average precipitation lasts long enough to dry out soil, reduce streamflow, and stress plants.
That matters because dry conditions can affect other hazard seasons too:
Dry vegetation can raise wildfire concern
- Dry soil can make heat feel more intense
- Long dry periods can make later rainfall more likely to run off rather than soak in
- Water stress can build gradually, affecting homes, farms, and ecosystems
Drought cycles can be shaped by climate patterns, but also by local weather over many months. A wet week does not always erase a long dry spell, and a dry month does not always create drought on its own.
Seasonal timing still matters
Even when climate patterns are active, the season itself remains important. Some hazards are more common during particular times of year because of sunlight, temperature, wind patterns, or vegetation.
Examples include:
Heat: More likely during warmer parts of the year in many places
- Wildfire conditions: Often influenced by dry, windy periods and accumulated fuel
- Flooding: Can be tied to heavy rain seasons, snowmelt, or storm tracks
- Tropical storms: Usually tied to a defined season in certain ocean basins
Climate patterns can strengthen or weaken these seasonal tendencies. But the underlying seasonal calendar still matters.
Why one pattern can affect different hazards at once
Climate patterns can influence more than one hazard because weather systems are connected. For example, changes in storm tracks can affect both rain and temperature. Changes in ocean temperature can affect moisture supply and storm development. Long dry periods can raise wildfire concern while also changing how floods behave when rain eventually arrives.
That is why preparedness works best when it focuses on flexible planning instead of a single hazard. A season that leans warmer or drier may call for different attention than a season that leans cooler or wetter.
What this means for preparedness
You do not need to predict the future to prepare well. A practical approach is to stay aware of broad seasonal guidance and keep your plans adaptable.
Helpful habits include:
Reviewing local official seasonal outlooks and updates
- Checking whether your household plans still work for heat, rain, wind, or smoke
- Keeping important documents, supplies, and contact lists easy to access
- Making sure everyone in the household knows where to get trusted information
- Planning for more than one hazard, not just the one you think is most likely
The goal is not to chase every signal. The goal is to notice when the background may be shifting and to stay ready for a range of possibilities.
A calm way to think about seasonal risk
Climate patterns are part of the reason disaster seasons can feel different from year to year. El Niño, La Niña, ocean temperatures, and drought cycles can all influence the odds of certain hazards. But they are only part of the story.
A steady preparedness mindset works better than trying to read every signal as a prediction. Look for broad trends, follow local official instructions, and keep your plans simple, flexible, and up to date.
That approach will not remove risk, but it can make seasonal uncertainty much easier to handle.