
“Bomb cyclone” is a term originating in meteorology, and not something used to get the public’s attention. Another way to think of it is explosive cyclogenesis. Technically, it applies to any low pressure system where the center of it drops 24 millibars in 24 hours, that is, a measure of barometric pressure, or the weight of our atmosphere upon us. This generally translates into violent weather. Our most recent weather front that froze out everything from Montana east was a bomb cyclone.
The above image, from Windy.com, takes a little screen gazing to understand. As I understand it, each concentric circle is a millibar, so that this storm more than qualifies as explosive cyclogenesis. To the right of it you will see a map of California. This system will be dumping a lot of warm moisture on top of existing snow. Since the ground is saturated already, the water plus melted snow has no where to go but out. They are calling for flooding in the Sacramento Valley. In the high country, the Sierras, anywhere from one to two feet of snow.


