A complex storm storm system is expected to produce a widespread moderate to locally heavy precipitation event across the region this weekend.

This system will feature a complex thermal profile, resulting in a period of sleet and freezing rain across our forecast area Saturday night into Sunday morning, especially across Northern New York, forecasters say.

Latest forecast indicate the heaviest precipitation and greatest threat for moderate to localized significant icing would be across the St. Lawrence Valley, NWS says.

In addition to the warm temperatures preceding this event, snow melt will enhance river rises from precipitation with the potential for minor river flooding, the service says.

Before the storm, we will see a cold St. Lawrence County, forecasters predict. Highs today will be around 20 with wind chill values of -10.

Tonight skies will be mostly cloudy with temps rising to around 32 by 5 a.m., NWS says.

The forecast through Tuesday is as follows:

Friday

A slight chance of rain showers, snow showers, and sleet before 9am, then a chance of rain showers. Cloudy, with a high near 42. Southwest wind 11 to 16 mph. Chance of precipitation is 40%. Little or no snow and sleet accumulation expected.

Friday Night

Rain likely, mainly after midnight. Cloudy, with a low around 40. Southwest wind around 9 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday

Rain. High near 48. Southwest wind 5 to 15 mph becoming north in the afternoon. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

Saturday Night

Rain before 10pm, then rain, possibly mixed with freezing rain between 10pm and 11pm, then freezing rain after 11pm. Low around 23. Northeast wind 9 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

Sunday

Freezing rain and sleet, possibly mixed with snow, becoming all snow after 11am, then gradually ending. High near 35. Northeast wind around 10 mph becoming west in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 80%.

Sunday Night

Mostly cloudy, with a low around 16. West wind 5 to 9 mph, with gusts as high as 23 mph.

Monday

Mostly cloudy, with a high near 30. West wind 3 to 6 mph.

Monday Night

Mostly cloudy, with a low around 16. Light and variable wind.

Tuesday

A 40 percent chance of snow showers. Cloudy, with a high near 31. Calm wind becoming northwest around 6 mph in the morning.

Tuesday Night

A 50 percent chance of snow showers. Cloudy, with a low around 22. Light and variable wind becoming south around 6 mph in the evening.

Wednesday

A 30 percent chance of snow showers. Mostly cloudy, with a high near 39. West wind 6 to 9 mph.