The National Weather Service in Seattle issued an excessive heat warning for the area in effect from 2 p.m. Tuesday through 9 p.m. Friday.

The unusual hot weather affecting the region could create a dangerous situation in which heat illness is possible, according to the National Weather Service. This week could reach temperatures of 100 degrees or more.

“Thursday should be the hottest day in this stretch for most spots, and high temperatures will probably be within 5 degrees of the all-time record high,” according to the release.

Tuesday will see temperatures in the mid-80s to lower-90s and will warm to the 90s to near 105 degrees by Thursday.

“Heat illnesses are possible with temperatures this hot,” according to the release. “People engaged in outdoor activities should have access to plenty of beverages as well as places to get out of the direct sunlight.”

The National Weather Service advises everyone to drink plenty of fluids and avoid strenuous activities; avoid the sun and seek share; stay in air-conditioned areas; check on relatives and neighbors who might be susceptible to heat-related illnesses; don’t leave children, elderly, disabled persons or pets in a hot car; and make sure outdoor pets have shelter from the sun and plenty of water to drink.

King County also encourages people to be alert to signs of heat exhaustion and heat stroke.

Heat exhaustion comes with signs of heavy sweating; weakness; cold, pale and clammy skin; a weak pulse; fainting; and vomiting.

Heat stroke comes with signs of a high body temperature (103 degrees or higher); hot, dry skin; rapid and strong pulse; possibly unconsciousness. Heat stroke is a medical emergency. Call 9-1-1.

For more “Beat the Heat” tips, go to www.kingcounty.gov/depts/health/emergency-preparedness/preparing-yourself/hot-weather.aspx.