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Question for the Board

ghost

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I've been following this site for quite a long time and learned a lot about weather from many of the knowledgeable people who have posted here over the years. There are still some things I haven't figured out yet though and I would like for someone to help me understand so I don't feel so dumb when I read posts and comments on weather boards.

Here's one that I see often and would like some help on. Could someone post some images that show the difference in a negative, neutral, and positive tilted trough? Embarrassed to say I've never figured this out.
 

Mike S

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This NWS page gives a good description

 

ghost

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This NWS page gives a good description

Thanks! Good info!
 
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