Wednesday, December 31, 2008

Roof Glaciers: Seattle Thaws Out

South County -- New Year's Eve:

This recent posting by the Amboy motivated Grumpy to take some evidence photos of his own showing the Great Melt here.

Like the Bale Castle, Grumpy's abode boasts of a 50-year steel roof. Grumpy had all but ignored what might be impending disaster with the snow piling up on his roof. The other evening, however, he ventured over to the Southeast eaves to observe what might be occurring.

He first noticed a slab of snow about 18-24 inches long, dangling below the aluminum gutters. Grumpy peered up at the gutters, fearing the worst: that he would find them being slowly torn from the edge of the roof by the inexorable forces of the tons of snow sliding from the gently sloping (~3:12) roof. Thankfully, the "glacier" was jumping over and past the gutters as it gently curved downward due to the force of its own gravity. Notice the "tracks" on the bottom of the snow, made by the ridges at the seams of the roof panels. No gutter damage!!

But look how wide this ribbon of snow was! It was continuous along the full length of the roof!!

As the air temperature continued to modify in the next couple of day, pieces of the hanging curtain of snow broke off. By New Year's Eve, no more snow lies on Grumpy's roof. One, obviously quite large slab of snow, came off the Northwest eaves during daytime one morning with a loud, rather disturbing metallic "clang". Grumpy feared that it may have reached a velocity such that it flew past the property line, cleared the wooden fence and smashed into some article of garden equipment stored along the neighbor's walkway between our two houses. Close examination revealed that, instead, this large chunk of snow had hit the wrought iron railing Grumpy had installed along the stairway next to our house. No damage was done!

No comments:

Post a Comment