Boise, ID

Cold Weather Forecasted; Snow Expected in Central Idaho Mountains

Bryan Dijkhuizen

From now until Friday night, there will be no. A weak and disorganized front will stall out over the area today, ensuring that the danger of showers remains in place throughout the day and evening.

Cooler temperatures aloft will aid in mixing the lower regions of the atmosphere and the inversion, which will result in a more stable environment.

In the north, a strong cold front will travel south and converge with the trough off the West Coast across British Columbia and Southeast Alaska by Thursday, bringing rain to the Pacific Northwest.

This storm will be accompanied by a warm front that will produce widespread precipitation on Thursday due to southwesterly winds above.

Snow levels will be between 400 and 5000 feet on Thursday, with 6-12 inches of additional snow expected in the central Idaho highlands and 4-7 inches expected in the mountains of southeast Oregon and northern California.

On Thursday evening, precipitation will begin to taper off behind the warm front before a thin cold front swing in from the southeast.

It is possible that the highest summits in the central Idaho highlands would get 14-18 inches of fresh snow by Friday.

Southwest flow aloft will reduce snow accumulations in the Boise metro area and Treasure Valley to less than an inch on average through Friday.

I am beginning on Saturday and continuing until Wednesday. There has been no notable change in the longwave pattern during the prolonged period. A high amplitude ridge anchored over the North Pacific/Alaska and the Pacific Northwest remains persistent.

According to the National Weather Service, an almost constant trend of shortwave radiation will sustain a reasonably steady snowfall of various intensities over the mountains until the first few days of next week.

Combined with strong winds, this will create potentially hazardous travel conditions in the mountains and surrounding areas. Lower altitudes will have more gaps in the snow, some mountain shadowing, and a generally lower snowfall intensity.

A minor westward movement in the storm track will reduce the likelihood of precipitation on Tuesday and Wednesday, but this will come at the expense of a colder air mass on those days.

Temperatures drop to somewhat below average on Sunday and Monday, with a more significant dip on Tuesday and Wednesday, with peak temperatures reaching 15-20 degrees below normal.

For snowfall, the mountains will receive an average cumulative snowfall total of 1-2 feet from Saturday through Tuesday, with more significant amounts occurring in isolated locations.

Accumulations of less than 4kft will be more difficult to come by during the weekend but are still conceivable, even on Christmas Day.

It is anticipated that the cooler air mass will bring a higher probability of accumulating snow on valley floors next week, albeit initially, moisture seems to be in low supply.

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