That is because earlier, at 9:00, volunteers were out shoveling the white stuff off the streets. Then, once shoveled, where do you put it?
At the beginning of March, in preparation for this day, the street was painted with two huge clovers and the space between the double lines was painted green for the length of Main St. This is done legally, now. It wasn't always so. The guys who started this affair, Jim Riggs and Bob Bliss, would invite people over to Riggs Beauty Salon for corned beef sandwiches and beer. Then about midnight, after they'd had plenty of liquid courage, they'd paint the single yellow line green with the help of anyone else willing to face arrest if caught. The powers that be laid in wait and caught Jim Riggs, arrested him, and put him in jail one year. The judge was friendly to one of the outstanding merchants, movers and shakers about town, and Jim was released the next morning without charges being filed. They finally made a deal to everyone's satisfaction, and the practice continues to this day.
Here is a very short sample. I was sorry I cut it off so soon.