On Sun, 7 Sep 2008 14:37:02 -0700 (PDT), Weatherlawyer

What does the legend indicate? Assumed heights? But not in minus
figures surely?
http://www.weatheroffice.gc.ca/ensem...me=00&Type=pnm
indicates a col. The 1016 mb lines in particular indicate that there
is a lot of vorticity or inversion so maybe it was mist.

How is it that the 1016 mb line indicates vorticity... be it positive
or negative?

An inversion, if strong enough, will enhance the presence of ground
clutter on a radar due to rf ducting.

As far as mist, fog, drizzle or any other weather was present, you
would need to see the local weather observations at the time.

Roger