Forecasters upgrade heat wave warning for Clark County

Forecasters have upgraded their warning for an unprecedented heat wave set to move into the region starting Friday, predicting dangerously hot temperatures as high as 108 degrees with little cooling overnight.

“Temperatures will already be in the low to mid-90s beginning Friday, but increase further to dangerous levels Saturday through Monday,” the weather service said in an excessive heat warning issued Wednesday afternoon. “High temperatures will run 20 to 30 degrees above normal for late June at many locations, putting numerous daily, monthly and possible all-time high temperature records in jeopardy.”

Dangerously hot conditions are forecast throughout Southwest Washington and Northwest Oregon, with temperatures between 100 and 108, the warning said. Vancouver’s all-time high was 108 degrees in July 2009.

The highest temperatures are expected Sunday, but Monday could exceed 100 degrees, as well, before gradually trending downward toward the middle of next week. Even then, temperatures will be 10 to 20 degrees above normal.

Little cooling is expected overnight, with low temperatures falling no lower than the upper 60s to low 70s throughout the weekend. That will increase the risk of heat-related illness.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the weather service warned. “Young children and pets should never be left unattended in vehicles.”

The warning also urged residents to reschedule strenuous activities to early morning or evening and wear lightweight, loose-fitting clothing.

To reduce risks at work, the Occupational Safety and Health Administration recommends frequent rest breaks in shaded or air-conditioned areas, the warning said.

Anyone overcome by heat should be moved to a cool and shaded location. Anyone with heat stroke is suffering a medical emergency requiring immediate treatment. Call 911.