This week’s satellite image is from over Lake Superior. I bet you can guess the dominant wind direction.
Right now, Lake Superior is warmer than the Michigan coastline, as shown by the Great Lakes Environmental Research Laboratory (GLERL).
As the cold air blows over the lake, it warms slightly, allowing it to absorb more moisture (warmer air can hold more moisture, according to the phase diagram of water). Some of the moisture condenses to form the cloud streets shown in this image. As the clouds cross over the cold Michigan soil, they cool, and the cold air cannot support as much moisture as the “warm” air (if you call 35 F “warm”), causing the moisture to condense into precipitation and fall, in this case, as snow.
The NWS has snow forecasted for the next few days, as the winds continue to blow from the Northwest, and the “high” temperatures remain in the teens.
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Source: College of DuPage – SATRAD