I just heard a loud clap of thunder here in Hamden. Thundersnow! This low is bombing out. Bombogenesis!
Bombogenesis really is a word! It describes the explosive growth of a low pressure system. We’re seeing it right now, especially in Eastern Connecticut.
Deb Drake @debirlfan @geofffox FYI, thundersnow in Quaker Hill. Scared the dog.
Thundersnow, a product of bombogenesis, was reported at Bridgeport, New Haven and New London between 6:30 and 7:30 PM EST. Yes, that’s very unusual. It’s also been reported at Marshfield, MA, Providence and Westerly, RI and on the Cape at Otis AFB.
Bombogenesis is an extreme example of cyclogenesis. I know, little help.
Cyclogenesis is the development or rapid intensification of a low pressure system. In New England we see this as winter lows hit the relatively mild waters of the Atlantic. If the cyclogenesis really goes nuts it’s bombogenesis!
This explosive development is seen as a rapid drop of the central barometric pressure.
Wind is reflective of a change in barometer over a given distance. The bigger the change over a given distance the stronger the wind. If the central pressure drops and everything else stay the same the pressure difference between two distant points (we call it pressure gradient or delta) will increase. So does the wind!
Over the rest of tonight, as the storm continues to ‘bomb’ we’ll see the pressure gradient increase. Even as the storm moves away from us this gradient will continue to deliver very strong winds. East of us, like the Massachusetts coast, the wind will be even stronger!
The rest of the forecast looks on target. We’ll be in-and-out of blizzard conditions throughout the overnight hours. Finally accumulations will be measured in feet across New England.
If you’re looking at weather observations and notice snow no longer being reported, sensors at a few airports have iced over and are out of service. This wasn’t a problem when humans did the observing.
Stay put and you should be OK. There will be power outages, but you’re better staying where you are than venturing out.