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Eyes on 540

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By Nick Szankovics on February 25, 2013, 11:50pm Last modified: February 26, 2013, 6:36pm

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When we speak of the 540 line, what is it we are talking about? And why is it so important to how we forecast winter weather? I have compiled a technical discussion on what it is, and how that simple number can and will influence our forecast this week.