UPDATE: A winter storm warning has been issued for Fairfield, New Haven and Litchfield counties. A winter weather advisory is in effect for Hartford and Middlesex counties.

No advisories have been issued for New London, Tolland and Windham counties.

The weather service said in an update Thursday afternoon that 4 to 8 inches of snow is forecast for Fairfield County.

A total of 5 to 7 inches of snow is forecast for New Haven County but lesser amounts in eastern parts of the county.

“Total snow accumulations between 5 and 7 inches,” the weather service said concerning New Haven County. “The eastern portion of the county may see less snow with accumulations 3 to 5 inches.”

A winter weather advisory is in effect for Hartford County. “Total snow accumulations between 2 and 4 inches.”

A winter storm warning is in effect for Litchfield County. “Heavy snow expected. Total snow accumulations between 5 and 8 inches.”

A winter weather advisory is in effect for Middlesex County. “Total snow accumulations between 3 and 5 inches.”

Original story: The weather itself on Christmas will be pleasant with temperatures rising into the 40s under sunny skies but with wind gusts approaching 30 mph at times.

This will all set the stage for an interesting but also complex snowstorm, which is scheduled to begin Friday evening. Folks residing in the western part of the state will see the most snow, possibly up to 7 inches of snow, while residents in the eastern part of the state could see as little as 1 to 3 inches of snow.

Snow could break out Friday afternoon in western parts of the state, while it may not start snowing until Friday night in eastern parts of Connecticut. The snow is forecast to mainly fall during the nighttime and overnight hours and should end by late morning Saturday.

Here is a full breakdown on the forecast for every county in the state via the National Weather Service:

Fairfield County snow details, via the weather service:

A winter storm watch remains in effect from Friday afternoon through Saturday afternoon. “Heavy snow possible. Total snow accumulations between 5 and 7 inches possible.” There is a 30 percent chance of snow after 1 p.m. Friday, but the storm really gets going in the evening hours.

New Haven, Middlesex and New London counties snow details, via the weather service:

“A winter storm system will affect the region Friday afternoon through Saturday morning with an accumulating, plowable snow,” the weather service said in a hazardous weather outlook.

There is a 20 percent chance of snow after 1 p.m. in western parts of New Haven County, where 3 to 7 inches of snow may accumulate.

In eastern parts of New Haven County and Middlesex County, 3 to 5 inches of snow is forecast. And in New London County, 2 to 4 inches of snow is forecast. The snow here won’t begin until Friday night.

Hartford County snow details, via the weather service:

Friday Night: Snow. Low around 19. Light northeast wind. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

Saturday: Snow likely, mainly before 1pm. Partly sunny, with a high near 30. North wind 3 to 6 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

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Tolland County snow details, via the weather service:

Friday Night: Snow likely, mainly after 9pm. Cloudy, with a low around 17. Calm wind becoming northeast around 6 mph after midnight. Chance of precipitation is 70%. New snow accumulation of 2 to 4 inches possible.

Saturday: Snow likely, mainly before 1pm. Partly sunny, with a high near 28. Northeast wind 5 to 7 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

Windham County snow details, via the weather service:

Friday Night: Snow likely, mainly after 10pm. Cloudy, with a low around 18. Calm wind becoming northeast around 5 mph after midnight. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

Saturday: Snow likely, mainly before 1pm. Partly sunny, with a high near 30. Northeast wind around 6 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

Litchfield County snow details, via the weather service:

Friday: A slight chance of snow after 1pm. Increasing clouds, with a high near 24. Wind chill values as low as -1. North wind 5 to 10 mph becoming light and variable in the afternoon. Chance of precipitation is 20%.

Friday Night: Snow. The snow could be heavy at times. Low around 16. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.

Saturday: A chance of snow, mainly before 1pm. Partly sunny, with a high near 27. Northeast wind 3 to 6 mph. Chance of precipitation is 40%.

Sunday and beyond forecast details for Connecticut, via the National Weather Service

Sunday: A chance of rain after 4pm. Mostly cloudy, with a high near 38. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 30%.

Sunday Night: A chance of rain and snow before 7pm, then snow likely between 7pm and 1am, then rain after 1am. Low around 27. Calm wind becoming south around 6 mph after midnight. Chance of precipitation is 90%.

Monday: Rain, mainly before 4pm. High near 45. South wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 80%.

Monday Night: A chance of rain before 9pm. Mostly cloudy, with a low around 23. West wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

Tuesday: Partly sunny, with a high near 32. West wind 13 to 16 mph, with gusts as high as 29 mph.

Tuesday Night: Mostly cloudy, with a low around 20. West wind 6 to 8 mph.

Wednesday: Partly sunny, with a high near 34. Southwest wind 6 to 11 mph, with gusts as high as 22 mph.