When the rapidly moving cold front collides with warmer air coming north from the Gulf of Mexico, strong surface winds, significant cold air advection, and extensive wintry precipitation occur.
2.
Secondly, a high pressure system was in place over eastern portions of Canada, allowing for cold air to be brought down into the coastal areas in a process known as cold air advection.
3.
At 7 pm, the low was placed near Indianapolis, Indiana with numerous thunderstorms east and south of the low and a squall line was moving into the southeastern US . Cold air advection behind the strong cold front fed into the cyclone as snow and sleet fell from eastern Iowa to central Michigan.
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