Togwotee Pass

( Discussion is generated from the previous day's afternoon forecast. )A winter storm warming is in effect for Western Wyoming from 11 pm tonight thru 11 am Monday morning as a Pacific low pressure system moves through the region. Snowfall is expected to start late this evening and intensify during the day on Sunday. Six to ten inches of new snow could accumulate by Sunday evening. Overnight lows in the mountains will be in the mid teens rising into the low twenties on Sunday. South to southwesterly ridgetop winds will increase to 15 to 20 miles an hour.The general avalanche hazard is expected to be CONSIDERABLE on Sunday in the Teton, the Greys River/Southwest Trails, and Continental Divide/Togwotee Pass areas. New snow, falling upon crusts and surface hoar, will slowly increase the possibility for backcountry travelers to trigger new soft slabs and loose snow sluffs. Far more dangerous are the deep slab instabilities that plague the region. These hard slabs lie upon a base of weak, faceted snow, and could fail to the ground. A single person, and more likely a snowmobile, could trigger these avalanches even after a slope has been crossed multiple times. Conservative decisions regarding terrain selection will be essential tomorrow.