The weight of snow obviously varies greatly, depending on the water content. "Average" snow might be around 15 lbs. per square ft. So, if you removed 2 feet, it would be about 30 lbs. per square ft. maybe? I think our roofs will handle a lot more than that per square foot. Heck, I weigh 225 and it doesn't even know when I'm up there.
Now of course you need to factor in the total load over the entire roof, but I still imagine the weight is acceptable. I'm thinking getting up there and shoveling is more dangerous than the snow load.
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