Dylan Smith wrote:

snip
The other week I saw a warm front
drawn like this. What's the difference between this and a 'normal' cold
front?

I use ADDs for prognostic charts and these charts often contain the warm
front that has not been colored in, which represents a "dry line."

http://www.hpc.ncep.noaa.gov/html/fntcodes2.shtml

A dry line is defined as "a boundary between warm, dry air and warm, humid
air in the southeast sector of a mature midlatitude cyclone; likely site
for severe thunderstorm development."




--
Peter