A warm frontal rain band has moved across the North Country and temperatures are rising, giving meteorologists at the National Weather Service concern over river ice breakup and the potential for ice jams and flooding.

The NWS believes that the warmup and rainfall could be enough to cause ice movement and potential breakup, especially in smaller rivers. They have posted a flood watch for much of the North Country, including southeast St. Lawrence County, from 4 p.m. today through Sunday evening.

There will be periods of moderate to briefly heavy rainfall in the entire region this afternoon into early this evening.

As temperatures drop from the high 40s into the low 30s tonight, the rain could turn to snow. Winds are expected to become gusty tonight, up to as much as 30 mph.

The chance of light snow will remain tomorrow, mainly in the morning. Highs will be in the 30s.

You can get up-to-the-minute weather information at the NorthCountryNow.com weather page.

The NWS forecast for the St. Lawrence Valley and the northwestern Adirondacks:

• Today: Rain. High near 48. South wind around 15 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

• Tonight: Rain likely before 11pm, then a chance of rain and snow showers between 11pm and 1am, then a chance of snow showers after 1am. Cloudy, with a low around 33. Southwest wind 10 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

• Sunday: A 40 percent chance of snow showers, mainly before 1pm. Mostly cloudy, with a high near 36. Southwest wind 14 to 16 mph. New snow accumulation of less than one inch possible.

• Sunday Night: Partly cloudy, with a low around 25. South wind 8 to 10 mph.

• Monday: Mostly cloudy, with a high near 43. Southwest wind 11 to 15 mph.

• Monday Night: A chance of rain showers before 1am, then a chance of rain and snow showers. Cloudy, with a low around 33. Southwest wind 10 to 13 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

• Tuesday: A chance of snow showers before 1pm, then a chance of rain showers. Mostly cloudy, with a high near 39. Southwest wind 5 to 9 mph becoming light in the afternoon. Chance of precipitation is 50%.

• Tuesday Night: A chance of snow showers. Cloudy, with a low around 24. Calm wind becoming southwest 5 to 9 mph in the evening. Chance of precipitation is 50%.

• Wednesday: A 40 percent chance of snow showers. Mostly cloudy, with a high near 30. West wind around 8 mph.

• Wednesday Night: Mostly cloudy, with a low around 17. West wind 5 to 8 mph.

• Thursday: Partly sunny, with a high near 30. South wind 5 to 10 mph.

• Thursday Night: A 30 percent chance of snow showers. Mostly cloudy, with a low around 22. Southwest wind 10 to 13 mph.

• Friday: A 30 percent chance of snow showers. Mostly cloudy, with a high near 31. Southwest wind 11 to 15 mph.