A cold front approaching Berkshire County from the west is presently generating a line of showers and thunderstorms moving west to east across New York State. By the time these showers reach us, between about 11 pm and 1 am tonight, they will have lost the energy due to environmental instability generated by daytime heating and will likely only be scattered and fairly light. Once this front moves through, we should remain dry for an extended period of time, through at least next weekend, as a sprawling surface high pressure system builds in and stalls across the entire eastern half of the country. This will occur due to a shift of the jet stream into Canada, with a broad ridge in the jet stream wave pattern building across the U.S..

Following the passage of the cold front, Monday and Monday night will be much cooler, although there will be considerable cloudiness in place until the low level moisture and instability associated with the upper-level cold pool within the jet stream trough lift out on Tuesday. From Tuesday through next weekend the skies should remain mostly clear with abundant sunshine. Temperatures will also moderate over the course of the week, as the warm ridge shifts eastward, with high temperatures rising a few degrees each day, through the 60s and into the 70s by the weekend.

Sunday Night

Partly cloudy this evening. Scattered, mostly light, showers are possible late this evening, between about 11 pm and 1 am. Skies will then clear for a time before clouds increase again toward morning. It will turn breezy and cooler after midnight. Probability of precipitation 50%. Likely rainfall totals 0.10″ or less.

Low temperatures in the low to mid 50s.

Light south-southwesterly winds this evening, shifting to westerly and increasing to 10-15 mph after midnight.

Monday

Mostly cloudy, very breezy, and cooler. Some scattered sprinkles or light showers are still possible, predominantly in the morning. Probability of precipitation 30%. Measurable rainfall is unlikely.

Temperatures will not rise much over the course of the day, with high temperatures in the upper 50s in Pittsfield, Adams, North Adams, and Willliamstown; near 60 in Lee and Stockbridge; near 60 to low 60s in Great Barrington and Sheffield; and mid 50s over the elevated terrain.

West-northwesterly winds at 10-20 mph, with gusts to 30 mph, particularly over the elevated terrain.

Monday Night

Considerable cloudiness during the evening, then clearing after midnight. Diminishing winds but much cooler than previous nights.

Low temperatures in the upper 30s.

West-northwesterly winds at 5-15 mph in the evening, becoming light after midnight.

Tuesday

Mostly sunny and pleasant, with seasonable temperatures.

High temperatures in the mid 60s in Pittsfield, Lee and Stockbridge, Adams, North Adams and Williamstown; mid to upper 60s in Great Barrington and Sheffield and; near 60 to low 60s over the elevated terrain.

Northwesterly winds at 5-10 mph.