Weather chart oddity?

On 2006-04-20, Peter R. wrote:
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."

Well, the exception here is that both the cold front with unfilled
sharks teeth and the warm front with unfilled semicircles both occured
over the Atlantic Ocean - not the sort of place you expect to find a dry
line!

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