A heat advisory is in effect from noon today through 8 p.m. on Thursday with heat index values over 100 degrees expected in St. Lawrence County, according to the National Weather Service (NWS).

Forecasters predict heat index values of 95 to 105 over the next two days in parts of the North Country. A shower or thunderstorm late morning is possible. Winds will be 6-9 mph.

Overnight temps will not be cool, with lows in the mid 70s, the service says.

Temps Wednesday and Thursday will push 100 as well, with Thursday likely being slightly cooler, NWS says.

Extreme heat may cause illness in some people.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

To reduce risk during outdoor work, the Occupational Safety andHealth Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke

is an emergency! Call 911.

Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Indoor temperatures may continue to rise after peak heating hours in poorly ventilated spaces. Those without air conditioning should consider the potential for lingering health impacts while indoors late in the day.

The extended forecast through next Monday is as follows:

Juneteenth

A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 92. Heat index values as high as 101. Southwest wind 8 to 11 mph.

Wednesday Night

Partly cloudy, with a low around 73. Southwest wind around 8 mph.

Thursday

A 50 percent chance of showers and thunderstorms after 11am. Partly sunny, with a high near 89. Southwest wind 7 to 10 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Light and variable wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday

A 30 percent chance of showers before 2pm. Partly sunny, with a high near 81. Northeast wind 6 to 8 mph.

Friday Night

Mostly cloudy, with a low around 62. Northeast wind around 5 mph becoming light and variable in the evening.

Saturday

A 40 percent chance of showers after 8am. Mostly cloudy, with a high near 77. Calm wind becoming northeast around 6 mph in the afternoon.

Saturday Night

A 50 percent chance of showers. Mostly cloudy, with a low around 64. Northeast wind around 6 mph.

Sunday

Showers likely. Mostly cloudy, with a high near 80. East wind 5 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 70%.

Sunday Night

Showers likely. Mostly cloudy, with a low around 65. South wind 9 to 11 mph. Chance of precipitation is 70%.

Monday

Showers likely. Partly sunny, with a high near 74. Southwest wind 11 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.