There is an increasing likelihood a winter storm — and bitterly cold temperatures — could hit the area late Wednesday night and continue into Friday, possibly extending the Christmas vacation for Wilton students.

“The likelihood is increasing for a prolonged period of snow and/or wintry mix ... several inches of snow are possible — particularly across the interior,” according to a hazardous weather outlook issued Monday for southwestern Connecticut by the National Weather Service.

“Closer to the coast, accumulating snow could be accompanied by a period of sleet and freezing rain.”

In Wilton, the schools have been on break since the weekend before Christmas. Students are scheduled to return Thursday, Jan. 2. So far this school year, there have been two snow days.

There is still uncertainty over these forecasts as the potential storm is over 48 hours away. The weather is, however, expected to get much colder in the coming days and after falling below freezing on New Year’s Eve, Tuesday, might not top 32 degrees again until Sunday.

Forecasts for the Wilton area call for a low of 14 Monday night, Dec. 30, followed by a high of 32 on Tuesday. New Year’s Eve’s low is expected to be 19.

On New Year’s Day, the high could be 27 before falling to 21 on Wednesday night. There is a 40% chance of snow developing that night. On Thursday, snow is in the forecast for much of the day, along with a high of 23. Thursday night, more snow is likely with a low of 15.

On Friday, Jan. 2, there is a 30% chance of more snow along with a high of 18 before the temperature drops into the single digits that night — for the first time this season. Saturday is expected to be sunny with a high around 25 before it warms up on Sunday into the upper 30s or low 40s.