St. Lawrence County could see scattered severe thunderstorms as early as this afternoon, the National Weather Service predicts.

The NWS has the region under a hazardous weather outlook, calling for the possibility of damaging winds and heavy rains.

They forecast a 40-percent chance of storms in Massena and Gouverneur. Temperatures will be in the low-90s, the NWS says, and a few degrees cooler in the mountains.

Meteorologists say Potsdam and Canton have a 40-percent of thunderstorms tonight, with a 50-percent chance in Ogdensburg.

Those areas forecast for thunderstorms should get hit by 10 p.m. at the latest, with a chance of continued showers and thunderstorms until 2 a.m.

On Wednesday, Potsdam has a 20 percent chance of showers and thunderstorms. Massena, Star Lake have a 20-percent chance after noon, with the same odds after 1 p.m. in Canton and Ogdensburg.

The detailed forecast for Potsdam is:

This afternoon: Scattered thunderstorms. Some storms could be severe, with damaging winds and heavy rain. Partly sunny and hot, with a high near 91. Heat index values as high as 95. Southwest wind around 16 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: Scattered thunderstorms before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 2am. Some storms could be severe, with damaging winds and heavy rain. Mostly cloudy, with a low around 70. Southwest wind 9 to 11 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 85. Southwest wind 9 to 16 mph.

Wednesday night: Partly cloudy, with a low around 62. Southwest wind 6 to 11 mph becoming light after midnight.

Thursday: A 30 percent chance of showers after 9am. Partly sunny, with a high near 76. Southwest wind 6 to 8 mph.

Thursday night: A 30 percent chance of showers. Mostly cloudy, with a low around 53. West wind 3 to 6 mph. New precipitation amounts of less than a tenth of an inch possible.

Independence Day: A 30 percent chance of showers before 9am. Mostly sunny, with a high near 75. West wind 3 to 7 mph.

Friday night: Mostly clear, with a low around 52. Light west wind.

Saturday: Sunny, with a high near 78. Calm wind becoming west around 6 mph in the afternoon.

Saturday night: Mostly clear, with a low around 54. Southwest wind around 6 mph.

Sunday: Mostly sunny, with a high near 78. Southwest wind 7 to 10 mph.

Sunday night: Partly cloudy, with a low around 59. Southwest wind around 8 mph.

Monday: Partly sunny, with a high near 81. Southwest wind 7 to 10 mph.