The attribution challenge
Answering whether extreme weather is increasing requires distinguishing between several related but different questions: Are we detecting more events? Are events actually more frequent? Are they more intense? Are they causing more damage? The answer can differ depending on which question you ask and which hazard type you examine.
Detection bias is real: more monitoring stations, better satellite coverage, and expanded communication networks mean that events which would have gone unrecorded 50 years ago are now documented. Simply counting events in databases like EM-DAT or EONET overstates the trend because the databases are more complete now than in earlier decades. Rigorous analysis requires comparing events observed under consistent monitoring conditions.
Heat waves: the clearest signal
Of all extreme weather types, heat waves show the clearest and most attributable trend toward increasing frequency, intensity, and duration. The physics is straightforward: a warmer atmosphere raises baseline temperatures, shifting the entire probability distribution and making extreme heat events more likely. Attribution studies consistently find that specific heat wave events — the 2021 Pacific Northwest heat dome, the 2023 Southern European heat wave — were made significantly more probable by anthropogenic warming.
Global datasets show that the number of record-breaking heat events is occurring at roughly twice the rate expected from natural variability alone. This trend is observable in instrumental records without sophisticated statistical analysis — the raw data shows it. Heat-related mortality, agricultural losses, and infrastructure stress from heat waves are all trending upward as a consequence.
Precipitation extremes: more intense, geographically variable
A warmer atmosphere holds approximately 7 percent more water vapor per degree Celsius of warming (the Clausius-Clapeyron relation). This basic thermodynamic principle predicts more intense precipitation events, and observations confirm the trend. Heavy rainfall events are becoming more frequent in most regions, including areas where total annual precipitation is declining.
The translation from precipitation intensity to flood damage depends on many factors beyond rainfall: urbanization, land use change, infrastructure capacity, and population exposure. Flood losses are increasing globally, but attributing this increase specifically to climate change versus socioeconomic factors requires careful analysis. Both are contributing — more intense rainfall falling on increasingly developed, impervious landscapes.
Tropical cyclones: intensity up, frequency stable
The total number of tropical cyclones globally has not shown a clear increasing trend over recent decades. What has increased is the proportion of storms that reach major intensity (Category 4–5). The maximum wind speeds achievable by tropical cyclones in a warmer ocean are higher, and the rate of rapid intensification (storms that strengthen dramatically in short periods) appears to be increasing.
This creates a scenario where the number of storms is roughly stable but the most dangerous storms are becoming more dangerous. For coastal populations, this matters enormously — the difference between a Category 3 hurricane and a Category 5 hurricane is not linear but exponential in terms of damage potential.
Wildfires: longer seasons, more area burned
Wildfire seasons in the western United States, Mediterranean Europe, Australia, and Canada are starting earlier and lasting longer. Total area burned has increased in most fire-prone regions over recent decades. Extremely large fires (megafires) that were historically rare are becoming more common. Climate change contributes through higher temperatures, lower humidity, earlier snowmelt, and longer periods of dry conditions.
However, fire behavior is also influenced by land management practices, fire suppression history, and development patterns. A century of fire suppression in western US forests created dense fuel loads that amplify fire intensity. Urban development into the wildland-urban interface exposes more people and structures to fire risk regardless of climate trends. Effective wildfire risk reduction requires addressing both climate and land management factors.
What monitoring platforms reveal
Platforms like PlanetSentry that aggregate events from multiple global sources provide a real-time window into the current state of extreme events. While a single day's event count is meaningless for trend detection, patterns over months and years become visible. Users who consistently monitor the globe develop an awareness of what 'normal' activity looks like — and recognize when activity in a particular region or hazard type departs from that baseline.
The scientific consensus, reflected in IPCC reports, is clear: some types of extreme weather are becoming more frequent and intense due to climate change, while others show less clear trends. The monitoring data available on open platforms allows anyone to observe the real-time manifestation of these trends. Understanding what the data shows — and what it doesn't — is essential for informed engagement with one of the defining issues of our time.