This may be obvious, but ...
Shane is right. As TM says, a foot of dry snow should be OK. However, in Maine, there is commonly more than a foot of dry snow on the ground at all times, and a more-or-less sudden change in the weather brings in a squall that comes down as rain. The weather guys are usually able to forecast this, but if there is even a chance of it happening, you need to get the snow off the TM pronto. Almost every winter in Maine, rain-on-snow roof collapses happen - depends on how much rain falls - and a TM won't put up with much.
Bill
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