We have had a lot of snow and prolonged, sustained cold which has enabled the snow to accumulate.  Lots of people got worried about their roofs and shoveled snow off their roof.  The Amish stopped by and offered to shovel my roof, for pay, but I declined.   A couple nights later I did take the snow rake and clear off the lower half of our north facing roof.  Finally, we benefited from warmer weather.  The snow on the barn roof slide off in great hunks that will likely take several weeks to melt.  The impact of the snow blocks landing was great enough to cause tools to fall from the barn wall and several bottles to fall off the shelving along the north wall.