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Hassan should have applied snow loads according to ASCE/SEI 7-05 standards, and they have given guidelines, indicating the procedure to apply even and uneven snow loads. ASE/SEI calls it as: BALANCED and UNBALANCED .

Good points being raised. Let me also clarify that my answer was with the assumption that only bottom cord of truss is supported on beam. If there is a horizontal reaction at pinned end then that would result in some torsion(reaction *distance to top of beam) in supporting beam. The action of wind + snow can result in uneven snow distribution of one side of the structure(if the area is considerable enough) resulting in substantial snow load. There is a good reference in book called "Why buildings fall down."

All, The attached article provides some insight about the subject program. The article is a very good read. Thanks. Str Eng Considerations PERP.pdf