How bomb cyclones form and create dangerous conditions

"According to the U.S. National Oceanic and Atmospheric Administration, certain storms undergo bombogenesis, which happens when a storm's central pressure drops at least 24 millibars in 24 hours. These storms are sometimes called bomb cyclones. Storm intensity is measured by central pressure, so the lower the pressure, the stronger the storm. Such rapidly strengthening storms are capable of producing heavy rain, blizzard conditions and intense winds that can create dangerous conditions such as downed trees and power outages."

"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, said Andrew Orrison, a meteorologist with the National Weather Service in College Park, Maryland. Bomb cyclones can happen in any season, but mainly occur during fall and winter when frigid air from the Arctic can creep south and clash with warmer air masses."

"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, said Orrison. Regions in North America that are prone to seeing bomb cyclones include Alaska, the Pacific Northwest and the Great Lakes region. It's not common to get bomb cyclones at lower latitudes. So generally speaking, you wouldn't see a bomb cyclone across, let's say, the southern United States, said Orrison."

Bomb cyclones form through bombogenesis, defined as a storm's central pressure dropping at least 24 millibars within 24 hours. Storm intensity is gauged by central pressure, with lower pressure indicating a stronger storm. Rapidly intensifying storms can produce heavy rain, blizzard conditions and intense winds capable of downing trees and causing power outages. These storms can occur in any season but mainly develop in fall and winter when frigid Arctic air moves south and collides with warmer air masses, generating strong low-pressure areas. Regions prone to bomb cyclones include Alaska, the Pacific Northwest and the Great Lakes, while lower latitudes seldom experience them.

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