How Bomb Cyclones Form and Create Hazardous Conditions

Such rapidly strengthening storms can produce heavy rain, blizzard conditions, and intense winds that lead to downed trees and power outages.

Jan. 31, 2026 at 10:55am

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Bomb cyclones are a type of rapidly intensifying storm that undergo bombogenesis, where the storm's central pressure drops at least 24 millibars in 24 hours. These powerful storms can create dangerous weather conditions like heavy rain, blizzards, and intense winds that can lead to downed trees and power outages.

Why it matters

Bomb cyclones are a significant weather phenomenon that can have major impacts on communities, causing hazardous conditions and disruptions. Understanding how these storms form and the risks they pose is important for preparedness and public safety.

The details

Bomb cyclones occur when a storm's central pressure drops at least 24 millibars in 24 hours, indicating rapid strengthening. This intense drop in pressure is known as bombogenesis. The lower the pressure, the stronger the storm. These storms can produce heavy rain, blizzard conditions, and intense winds that can down trees and power lines.

  • Bomb cyclones can happen in any season, but mainly occur during the fall and winter months.

The players

National Oceanic and Atmospheric Administration (NOAA)

The U.S. government agency that defines the criteria for a storm to be considered a bomb cyclone.

Andrew Orrison

A meteorologist with the National Weather Service in College Park, Maryland.

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What they’re saying

“If you're watching TV at night and the weather report comes on and you're hearing 'bomb cyclone' being used, that usually means there's quite a bit of active weather going on.”

— Andrew Orrison, Meteorologist

“It's really the clash of those air masses that really kind of helps to generate the areas of low pressure in the first place.”

— Andrew Orrison, Meteorologist

The takeaway

Bomb cyclones are a powerful and dangerous weather phenomenon that can cause significant disruptions and hazardous conditions. Understanding how they form and the risks they pose is crucial for communities to prepare and stay safe during these intense storms.