Is there something specific about the storm that is unique in its formation or impact? Ed Vallee Those types of temperature gradients are typically a railroad track, so to speak, that the storms can form along and ride up along, and that kind of helps to increase the lift in the atmosphere and ultimately the amount of precipitation that falls. When you have the Gulf Stream just off the East Coast, that naturally leads to warmer conditions, and when you get this cold air coming in behind it - or coming in from the North - that leads to that very tight temperature gradient from just off the Southeast Coast onto the mainland of the East Coast. What do you mean when you say “tight temperature gradient”? Ed Vallee Under the right conditions, that can lead to a very strong storm and ultimately some pretty good snowfall across the Northeastern US. The bomb is really not that uncommon, but it does indicate a very strong, strengthening low-pressure system. When they phase together with that really tight temperature gradient, that’s the ingredient you need to have a storm start to strengthen really rapidly. When you have this really tight temperature gradient, you can get these pieces of energy - weather disturbances - coming through the atmosphere. You have the Gulf Stream just off the Southeast Coast there, and you have all this really cold air coming in from the North. What conditions have to be present to make that bomb happen? Ed ValleeĪtmospheric dynamics are going to differ by storm, but in this situation, there is a really tight temperature gradient along the East Coast. The official definition of a “bomb” is for an area of low pressure to strengthen at least 24 millibars in 24 hours. The lower the millibars, the stronger the storm. It is definitely a real term, and there’s a strict definition that has to happen for it to be considered a “bomb.” The strength of an area of low pressure - so a storm system - is measured in what we call millibars. So is “bomb cyclone” a real term? Ed Vallee This interview has been edited and condensed for clarity. “A lot of people,” he warned, “are going to be very cold.” I spoke to Ed Vallee, a North Carolina meteorologist, to understand this one-two punch of bomb cyclone and brutal chill. Cold temperature records will likely be shattered, as highs in the mid-Atlantic states and New England will be in the teens and single digits Friday into Saturday. But even more bone-numbing Arctic cold will follow in its wake.
The bomb cyclone will wallop the Eastern Seaboard Wednesday into Thursday. kfyn4KnTCm- Ryan Maue | January 2, 2018 The storm really kicks into gear off the Carolinas w/large area of very strong winds along southern flank of "eye-like" feature or low center. Animation of low-level wind speed showing the development of the massive circulation of Nor'easter "bomb" from Wed to Fri.
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