On Sun, 13 Dec 2009 23:29:27 -0600, cavelamb
wrote:

Anybody know what that purple thing connecting the two Lows over California
is called? I don't think I've ever see than symbol before...

http://www.weather.com/maps/maptype/...dex_large.html

It's called an occluded front, (when a cold front overtakes a warm
front):

http://ww2010.atmos.uiuc.edu/guides/...ifs/ofdef2.gif