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* WHAT...Heavy snow above 6000 feet. Total snow accumulations of 5 to 10 inches possible, with higher amounts above 7000 feet. * WHERE...Areas above 6000 feet near Alpine, Doney Park, Flagstaff, Forest Lakes, Fredonia, Grand Canyon, Heber- Overgaard, Jacob Lake, Kachina Village, Munds Park, North Rim, Payson, Pine-Strawberry, Pinetop-Lakeside, Sedona, Show Low, Valle, Whiteriver and Williams. * WHEN...From Saturday evening through Monday morning. * IMPACTS...Travel could be very difficult to impossible. Patchy blowing snow could significantly reduce visibility. The hazardous conditions could impact the morning and evening commutes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...A strong cold front will move west to east and deliver heavy snowfall Saturday evening into Sunday. For most areas, the bulk of accumulations will occur during this period. However, additional waves of snowfall are possible through Monday. Snow forecast from 7 PM Saturday to 11 AM Monday: Alpine 3 to 5 inches Doney Park 4 to 6 inches Flagstaff 8 to 12 inches Forest Lakes 13 to 19 inches Fredonia 0 inches Grand Canyon 3 to 5 inches Heber-Overgaard 2 to 4 inches Jacob Lake 4 to 6 inches Kachina Village 9 to 13 inches Munds Park 9 to 13 inches North Rim 6 to 10 inches Payson 0 to 1 inches Pine-Strawberry 4 to 8 inches Pinetop-Lkside 3 to 5 inches Sedona 0 inches Show Low 1 to 3 inches Valle 1 to 3 inches Whiteriver 0 to 1 inches Williams 6 to 10 inches.