wrong-o, mary lou. Lake Tahoe is only 22 miles long and, more importantly, only 12 miles wide. Lake effect snow takes a minimum of 62 miles of water/fetch.
From lake effect wiki
The Truckee Meadows and other parts of Northern Nevada which are normally in the rain shadow of the Sierra Nevada can, when conditions are right, have severe snowfall as a result of lake effect from Lake Tahoe. Recent severe examples of this phenomenon have occurred as recently as 2004, dumping several feet of snow in the normally dry region.