Residents across St. Lawrence County should prepare for hot and humid conditions Tuesday as the National Weather Service has issued a heat advisory for much of the region.

The advisory is in effect from 11 a.m. to 8 p.m. Tuesday, July 14, with heat index values expected to range from 93 to 103 degrees.

The warning covers northern St. Lawrence County, including communities such as Ogdensburg, Massena, Potsdam, Gouverneur, Star Lake and surrounding areas.

The hottest conditions are expected between 2 and 7 p.m.

Officials are advising residents to drink plenty of fluids, remain in air-conditioned spaces when possible, avoid prolonged exposure to direct sunlight and check on neighbors, relatives and others who may be vulnerable to extreme heat.

Those who must be outdoors are encouraged to wear lightweight, loose-fitting clothing and limit strenuous activities until the cooler morning hours, the weather service says.

Residents should also watch for signs of heat exhaustion and heat stroke, including dizziness, heavy sweating, weakness, nausea, confusion or loss of consciousness.

The National Weather Service is also warning of the possibility of strong to severe thunderstorms Tuesday evening into Tuesday night. Forecasters say areas near the Canadian border could face an enhanced risk for damaging winds, while other parts of northern New York remain under a lower severe weather risk.

No severe weather spotter activation is expected at this time, but residents are encouraged to monitor forecasts and weather alerts throughout the day Tuesday.