Why massive storm hitting US is a 'bomb cyclone'

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DENVER (AP) Meteorologists say the storm raging across the West and Midwest was caused by a sudden and severe drop in air pressure called a "bomb cyclone" or "bombogenesis."

Low air pressure is how meteorologists measure the strength of a storm, and this is the strongest in Colorado since at least 1950.

Pressure readings are similar to what's seen in Category 2 hurricanes.

Meteorologist Ryan Maue of weathermodels.com said it's very rare.

Maue says forecasters have been warning about the storm for days, but some people underestimated it and wound up stranded.