Hi Mike,That's good advise from Uriph.
Althought snow on the roof looks innocent enough now.
When the sunshines, it starts to melt and gets even heavier.
Ice forms in the eaves and prevents run-off
Behind those little ice dams more ice forms and adds to the weight
on your roof. Your pics shows that your roof has a good pitch to it.
However, it's the strength of your joists and trusses that counts now.
And be damn careful if you decide to go up on your roof.
Wear the best damn boots you've got with deep treads for the best traction.
No sneakers (ie:running shoes or street shoes) for this job.
People have broken bones or worse falling off snow covered roofs....
Getting a ladder up against the eaves and pulling the snow off
the roof with a makestift 2x4 board with a 2x2 braced pull handle attached
works quite well. Or even an inverted push broom works too.
This gets most of the snow and the weight off the roof
without endangering yourself too much...
and I'll bet you thought just clearing your driveway
was all you had to think about....
Cheers mate

David