On Apr 15, 11:19*am, "Dave R." wrote:
Ah thank you. In all the years I been following the weather I've never heard
it used. OK you have evidently pointed me in the right direction.
Many thanks.

An explosively deepening depression can also be known as a "bomb".
Here's an example of its useage from the Southern Hemisphere. I always
find the Southern Hemisphere "upside down" depressions so odd (you can
see the development of the "bomb" on here). I know I shouldn't, but I
can't help it!!

Paul