. . . For the 19 hours following the southeasterly segment of the event, snowfall was light at Sault Ste. Marie. The surface low moved slowly northeastward, making the transition from southwesterly low-level flow to westerly a gradual one. During this period, sounding profiles found cold and dry air. This was not surprising since low-level flow was off the cold and relatively dry, upper Michigan peninsula. Light snow did occur during this time, however it was associated with synoptic lift provided by the closed upper tropospheric low. It wasn't until after about 0900UTC (10 December) that the flow trajectory became west-northwesterly which meant the low-level air reaching Sault Ste. Marie was coming off Lake Superior.
. . . At 1034 UTC, a special observation from Sault Ste. Marie indicated that heavy snow had begun again.
