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Jan 9-10th snow threat. Disco/OBS


dmc76

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Makes sense. What's your take on any possible lake enhancement?

Wind direction is not favorable really for Chicago, maybe far southern Cook looking at wind direction alone. But more importantly, 850 mb temps are progged to be marginal at best this evening when boundary layer flow is closest to due north based on current lake temps. I think there could be a decent period of lake enhancement into parts of northwest Indiana (probably favoring Porter and LaPorte but possibly clipping Lake) later tonight as the much colder 850s arrive while wind direction is NNW.
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Not the greatest confidence in my earlier call of 5-7"...concerns are obvious with timing of changeover and temperature drop.  Should snow hard when it does change over so an hour or two either way will be important.  Knocking off an inch or two may be the way to go. 

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LOT Aviation update:

IT

LOOKS LIKE THE PRECIPITATION IN NORTHWEST INDIANA MAY HOLD AS RAIN

FOR MOST OF THE AFTERNOON...AND POSSIBLY INTO EARLY EVENING WHEN

THE MORE SIGNIFICANT PRECIPITATION WILL BE OCCURRING. WITH THE

SNOWFALL EFFICIENCY REDUCED...EXPECT THAT THE 1/2SM-3/4SM VSBYS

WILL BE AS LOW AS THINGS GET FOR THE MOST PART.

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