It went on: 'From starting zones that have retained some snow the avalanches can reach an exceptionally long way. Exposed buildings and exposed parts of transportation routes are endangered. Extensive safety measures are to be maintained in particular for the late morning.
'In the afternoon the natural avalanche activity will decrease. Without question, it is inadvisable to engage in ski touring, freeriding and snowshoe hiking outside marked and open pistes.'
A reconnaissance flight is planned over the area to help determine the situation and how to proceed.
A number of other Valais villages were also isolated by the heavy snow. The Simplon region of Valais was hit by 3.5 feet of snow in a 24-hour period, the ATS news agency reported.
A webcam showing the snow-covered resort
Mud and rockslides, as well as flooding, have forced the closure of a number of roads across Valais, as has the risk of avalanches, which regional police have said is currently at the highest possible level.
At lower altitudes, heavy rains have meanwhile forced the evacuation of around 20 people from the tiny village of Eyholz, and the hamlet of Mottec was also emptied as a precaution, the RTS broadcaster reported.
Beyond Valais, the first men's World Cup downhill training run in Wengen, in the canton of Bern, was cancelled Tuesday due to snow and high winds, organisers said.
Overnight winds of up to 125 miles per hour also meant there was significant damage to infrastructure on the course, notably at the finish area where tents and the stands were hit. The piste itself was unaffected.