The National Weather Service in Seattle converted an excessive heat watch into an excessive heat advisory for King and Pierce counties through Monday.

The advisory went into effect Sunday afternoon and will last until 11 p.m. Monday.

Temperatures could reach the mid-90s inland, including the South Puget Sound area, and should begin to cool on Tuesday.

The Weather Service advises those sensitive to heat spells, such as the elderly and those who work outdoors, take extra precautions by rescheduling strenuous activities to the early morning or evening hours and wear light weight, loose fitting clothing and drink plenty of water.

The Occupational and Safety Administration additionally recommended frequent breaks in shaded or air conditioned environments to help combat possible heatstroke.

Heatstroke symptoms include:

• high body temperature, 104 degrees or higher is the main sign of heatstroke;

• lack of sweating;

• nausea and vomiting;

• flushed skin;

• rapid breathing;

• racing heart beat;

• headache;

• confusion;

• unconsciousness; and

• muscle cramps and weakness.

Anyone overcome by heatstroke should be moved to a cool, shaded location and 911 should be called for emergency medical assistance.

Additionally, the Weather Service advises those seeking relief from the heat by heading to local rivers and lakes use caution because of cold water temperatures and swift river currents this time of year.