What does this ominous term, and related jargon like “bombogenesis,” tell us about the storm pounding states from Texas to Minnesota this week?
A broken shovel, white flag and a sign that says"I surrender" were placed on top of a 5-foot snow bank in Iron Mountain, Mich. By Russ Schumacher March 13 at 12:27 PM Blizzards in March, when our thoughts start turning to spring, are never good news. But warnings of “bomb cyclones” take the intensity to a new level.
What, then, distinguishes a “bomb” from a run-of-the-mill cyclone? The term was coined by famed meteorologists Fred Sanders and John Gyakum in a 1980 paper and was inspired by the work of the Swedish meteorological pioneer Tor Bergeron. It describes a cyclone in which the central pressure drops very rapidly — an average of 24 millibars in 24 hours, at Bergeron’s latitude of 60 degrees north .
— Alex Lamers March 12, 2019 Wind speed is a function of the “pressure gradient” — the magnitude of the change from higher atmospheric pressure outside the cyclone to low pressure at its center, as well as how quickly the pressure changes over time. This means that a storm that rapidly develops an intense low-pressure region will have persistent strong winds.
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