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Summary: A cold front is moving through Berkshire County this afternoon. As skies clear and winds become light, temperatures will plummet overnight. Most places will see temperatures fall into the lower 20s and any place that has yet to experience a killing freeze should tonight. (Addendum: the latest data suggests we may have more cloud cover than expected, with temperatures only falling into the mid 20s).

Tomorrow should be a fairly nice fall day as surface high pressure builds over the region behind the cold front. As today’s cold front moves back to the north as a warm front, skies will cloud up for Tuesday night and Wednesday. We are even likely to see some light mixed precipitation on Wednesday morning. Right now it appears that this will be mostly in the form of rain but it could start as a period of light snow, particularly in the higher elevations. It should be much milder on Thursday after the warm front passes.

Meanwhile, an early season snowstorm in the northern Rockies today will gradually drift into the Great Plains and then northeastward, passing north of the Great Lakes on Thursday and Friday. As this surface low pressure system passes to our north, it will drag its warm front through on Thursday afternoon. This warm front will bring even warmer air into our region Thursday night and Friday as the southern branch of the jet stream passes to our north and subtropical air floods in. There is the chance for some rain showers with the warm frontal passage but rain, possibly heavy, is much more likely as the low drags its strong cold front through during the day on Friday. This will lead to a much cooler weekend, probably windy on Sunday, as the jet stream again dips to our south.

Monday Night

Mostly clear with light winds. Becoming quite cold across the county by morning. Cloud cover will increase somewhat toward morning, particularly over South County, which may keep temperatures up a bit.

Low temperatures in the mid 20s in most locations, temperatures could reach the low 20s in a few wind protected spots over the higher terrain. Low temperatures may only fall to the upper 20s over portions of South County due to some cloud cover.

Light north-northeasterly winds.

Tuesday

Partly cloudy in South County during the morning, otherwise mostly sunny and seasonably cool. There will likely be an increase in clouds late in the day.

High temperatures in the mid 40s in Pittsfield, North Adams, Adams and Williamstown; mid to upper 40s in Lee, Stockbridge, Great Barrington and Sheffield and; near 40 to low 40s over the elevated terrain and hilltowns.

Northwesterly winds at 5-10 mph.

Tuesday Night

Mostly cloudy. There is the chance of a rain shower, possibly a snow shower over the elevated terrain, toward daybreak. Probability of precipitation 30%.

Low temperatures generally in the upper 20s with temperatures rising into the low 30s by daybreak.

Winds light and variable, becoming light south-southwesterly toward morning.

Wednesday

Mostly cloudy with a good chance for showers in the morning. Any precipitation should be predominantly rain, although there could be a period of wet snow over the elevated terrain. Probability of precipitation 50%. Precipitation should be light, with 0.10″ or less liquid and no more than a light dusting of snow. Skies should begin to clear during the afternoon.

It will be a bit milder than Tuesday with high temperatures near 50 in Pittsfield, North Adams, Adams and Williamstown; low 50s in Lee, Stockbridge, Great Barrington and Sheffield and; mid 40s over the elevated terrain and hilltowns.

West-northwesterly winds at 5-10 mph.