Warmer temperatures will be accompanied by thunderstorms as high-pressure centers over the North Country this week, according to the National Weather Service.

Temperatures today are expected to reach the low 70s and rise into the 80s by Wednesday. Thunderstorms will threaten most of St. Lawrence County throughout the workweek.

For up-to-date weather information visit www.NorthCountryNow.com/weather.

A seven-day forecast follows:

• Today: Sunny, with a high near 71. Southwest wind 8 to 13 mph.

• Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Increasing clouds, with a low around 58. South wind around 7 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

• Tuesday: Showers and thunderstorms likely, mainly between 8am and noon. Some storms could be severe, with large hail and damaging winds. Mostly cloudy, with a high near 82. Southwest wind 7 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

• Tuesday Night: A 40 percent chance of showers and thunderstorms before midnight. Increasing clouds, with a low around 64. Southwest wind 6 to 11 mph becoming light west after midnight. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

• Wednesday: A 50 percent chance of showers and thunderstorms after 11am. Some storms could be severe, with large hail and damaging winds. Mostly cloudy, with a high near 82. Calm wind becoming southwest 5 to 8 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

• Wednesday Night: Showers and thunderstorms likely, mainly after 9pm. Mostly cloudy, with a low around 63. South wind around 6 mph becoming southwest after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

• Thursday: Showers and thunderstorms likely before 9am, then showers likely and possibly a thunderstorm after 9am. Mostly cloudy, with a high near 73. West wind 6 to 8 mph. Chance of precipitation is 60%.

• Thursday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 47. Northwest wind 6 to 8 mph. Chance of precipitation is 60%.

• Friday: A 30 percent chance of showers. Mostly cloudy, with a high near 61. Northwest wind 7 to 9 mph.

• Friday Night: A 30 percent chance of showers. Partly cloudy, with a low around 40. Northwest wind 5 to 7 mph.

• Saturday: Sunny, with a high near 63. Northwest wind around 7 mph.

• Saturday Night: Mostly clear, with a low around 42. West wind around 6 mph becoming light and variable in the evening.

• Sunday: Mostly sunny, with a high near 69. Southwest wind 5 to 9 mph.