Traditionally, a “bomb cyclone” is a low-pressure system deepening (strengthening) by more than 24 MB over a 24-hour period. The definition usually applies to middle/upper middle latitude. Although a “bomb cyclone” is not a tropical cyclone, these systems can reach category-1 hurricane force on the Saffir Simpson Scale.

NOAA issues a Winter Storm Watch for the Mid-Atlantic/southern New England coastline. ECMWF is most aggressive with the snowfall amount forecast for New England where 10-20 in. of snow acros southeast Massachusetts is indicated. Of note, the GFS forecast is considerably lower as the storm is farther offshore.

NOAA/NWS projects significant snow along the Northeast Corridor Coast FRI/FRI night and New England/northern Mid-Atlantic region SAT/SAT night. Forecast confidence is HIGH that this storm will occur.

Stratospheric cooling is projected for the 11-15-day period across Canada indicating that the troposphere (below) will expand and warm consequently preventing a frigid 11-15-day forecast as indicated by GFS and other models to validate.