Move over, Polar Vortex: there is a new big freeze brewing.

Forecasters in the United States are warning of a "bomb cyclone", which they say will send the already-freezing temperatures along the east coast plummeting further.

Blizzards, ice and snow are expected in storms forecast to hit New England overnight on Wednesday, after snow fell on Wednesday in Florida for the first time in more than a quarter of a century.

Meteorologists coin the term bomb cyclone because the storm's pressure is predicted to fall so fast - an indicator of explosive strengthening.