Originally Posted by
mduell

The snow has been in the forecast for Sunday since Saturday morning...
Code:
KORD 031137Z 0312/0418 28007KT P6SM OVC027
FM031500 29007KT P6SM OVC035
FM040100 VRB03KT P6SM BKN040 OVC090
FM041200 18005KT 6SM -SN OVC060
FM041400 17006KT 3SM -SN SCT025 OVC050
FM041530 17007KT 1SM -SN OVC015
They were expecting snow, but not the same intensity and duration than what actually ended up happening. Most forecasts expected 1 inch with lots of melting and no accumulation within miles of the lake.
What happened was 6.4 inches at ORD, which easily qualified as the biggest one-day first-of-season snowfall in history.