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Question
What are the dashed lines on a Wheather map?



         Happy Wheather,
         
         Willow

Answer
Hi Willow

On the surface weather map the dashed lines are most likely isotherms:

http://ww2010.atmos.uiuc.edu/%28Gl%29/guides/maps/sfcobs/cntr/thrm.rxml

For more about lines on weather maps:

http://www.theweatherprediction.com/basic/isopleths/

And for more about learning about weather:

http://weatherknowledge.com/learn.html  

Meteorology (Weather)

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Donald Rosenfeld

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Any questions (except private) answered from the 1st grade level on up pertaining to any aspect of Weather. I am a 20 year member of the American Meteorological society and a long time forecaster of eastern United States snow storms and Hurricanes.

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