A heat advisory is in effect through 8 p.m. Thursday in St. Lawrence County with heat index values as high as 105 possible, according to the National Weather Service (NWS).

There will be a chance of a thunderstorm, mainly before noon, NWS says. Highs will reach into the low to mid-90s. Overnight lows will only be around 73.

Highs on Thursday will reach near 88 with heat index values around 92.

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 and

Health 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 Tuesday is as follows:

Thursday

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 88. Heat index values as high as 92. Southwest wind 6 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night

Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 64. Light north wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday

Partly sunny, with a high near 78. Northeast wind around 6 mph.

Friday Night

A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 61. Light east wind. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A 50 percent chance of showers. Mostly cloudy, with a high near 77. Northeast wind 3 to 6 mph.

Saturday Night

Showers likely. Mostly cloudy, with a low around 66. Light and variable wind becoming southwest around 6 mph after midnight. Chance of precipitation is 70%.

Sunday

Showers likely. Mostly cloudy, with a high near 80. Southwest wind around 11 mph. Chance of precipitation is 70%.

Sunday Night

Showers likely, mainly before 2am. Mostly cloudy, with a low around 63. Southwest wind around 15 mph. Chance of precipitation is 70%.

Monday

A 50 percent chance of showers. Partly sunny, with a high near 73. West wind 8 to 11 mph becoming north in the afternoon.

Monday Night

Partly cloudy, with a low around 58. North wind 6 to 8 mph becoming west after midnight.

Tuesday

Sunny, with a high near 81. West wind around 7 mph.