Wednesday, March 13, 2019
An intense and ferocious winter storm -- a "bomb cyclone" -- is expected to bring hurricane-force wind gusts, blizzard conditions and a flood threat across a swath of the US heartland Wednesday. A bomb cyclone occurs when there is a rapid pressure drop, falling at least 24 millibars (which measures atmospheric pressure) over 24 hours known as bombogenesis.
Explosive cyclogenesis (also referred to as a weather bomb, meteorological bomb, explosive development, bomb cyclone or bombogenesis) is the rapid deepening of an extratropical cyclonic low-pressure area. The change in pressure needed to classify something as explosive cyclogenesis is latitude dependent. For example, at 60° latitude, explosive cyclogenesis occurs if the central pressure decreases by 24 mbar (hPa) or more in 24 hours. This is a predominantly maritime, winter event, but also occurs in continental settings, even in the summer.[not in citation given] This process is the extratropical equivalent of the tropical rapid deepening. Although their cyclogenesis is totally different from that of tropical cyclones, bombs can produce winds of the same order as the first categories of the Saffir-Simpson scale and give heavy rainfall. Even though only a minority of the bombs become so strong, some have caused significant damage.
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