Bomb Cyclones Bring Dangerous Weather Conditions

Rapidly strengthening storms can produce heavy rain, blizzards, and intense winds.

Jan. 31, 2026 at 2:55pm

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Bomb cyclones, a type of rapidly intensifying storm, can bring hazardous weather conditions like heavy rain, blizzards, and powerful winds that can lead to downed trees and power outages. These storms undergo a process called bombogenesis, where the central pressure drops at least 24 millibars in 24 hours, making them stronger and more dangerous.

Why it matters

Bomb cyclones can occur in any season but are more common during the fall and winter when cold Arctic air clashes with warmer air masses. Regions like Alaska, the Pacific Northwest, and the Great Lakes are particularly prone to these intense storms, which can create life-threatening conditions for residents.

The details

According to the National Oceanic and Atmospheric Administration, a storm is considered a bomb cyclone when its central pressure drops at least 24 millibars in 24 hours. This rapid strengthening is known as bombogenesis and results in the storm producing heavy precipitation, blizzard conditions, and powerful winds. Meteorologists use the term 'bomb out' to describe this process.

  • Bomb cyclones can occur in any season, but are more common during the fall and winter months.

The players

Andrew Orrison

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

U.S. National Oceanic and Atmospheric Administration

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

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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 type of rapidly intensifying storm that can bring dangerous weather conditions like heavy rain, blizzards, and powerful winds. Understanding how these storms form and the regions most prone to them can help communities better prepare for and respond to these potentially life-threatening weather events.