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IndySouth
Rank: Whirlwind
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Bloomington, IN
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Joined: 16-November 08
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IndySouth

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16 Nov 2008
Here are a few questions that I never got a chance to pose to local meterologists: the Indianapolis I-70 phenomena in the winter. It is really not a phenomena since it is only an Interstate, but nevertheless there has to be an explanation as why it occurs not only in forecast but also in actual terms of the results of winter events.

In my area during a typical winter the all snow line is usually north of I-70. In successive winters (25+) this interstate usually can be relied upon as the demarcation between an all snow event north and a snow/ mix bag event south. I guess my question(s) regarding climate are: Does I-70 itself pose some sort of meterological phenoma? Could the Interstate provide some sort of steering mechanism to meterological events? and does the flatter terrain of this corridor have an effect as opposed to the hills further south? Overall, with few exceptions, the temperatures during these events are usually the same or maybe 1-2 degrees difference at most.

Could this be just a coincidental outcome of the common winter southwestern and Colorado type systems that eventually run up the Ohio River Valley 100-125 miles to the south (of I-70)? Furthermore, if the annual temperature decreased by 1C hypothetically how much further south would the (average) all snow line be located from this interstate? 50,100 miles etc.

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