A heat advisory was issued by the National Weather Service on Monday at 6:22 a.m. valid from noon until Wednesday 10 p.m. for Grande Ronde Valley, Northern Blue Mountains of Oregon and Southern Blue Mountains of Oregon as well as Wallowa County.

"Hot temperatures with modest overnight relief. Afternoon high temperatures of 90 to 105 degrees, highest in lower valleys and canyons. Overnight low temperatures in the mid 50s to upper 60s, lowest in high valleys," says the weather service. "Hottest temperatures during this long-duration heatwave are expected Tuesday and Wednesday."

"Hot temperatures may cause heat-related illnesses," states the weather service.

Weather service Heat wave safety tips: Stay safe with these recommendations

• Stay hydrated: Make sure to drink plenty of fluids.
• Seek shelter: Opt for an air-conditioned room to stay comfortable.
• Avoid sun exposure: Stay out of the sun, and check up on relatives and neighbors.
• Child and pet safety: Never leave young children and pets alone in vehicles, especially during hot weather when car interiors can become dangerously hot in a matter of minutes.
• Caution outdoors: Take extra precautions if you work or spend time outside.
• Select the ideal time: If possible, move strenuous activities to early morning or evening for more favorable conditions.
• Recognize heat-related issues: Recognize the warning signs and familiarize yourself with symptoms of heat exhaustion and heat stroke.
• Stay cool with clothing: Select lightweight and loose-fitting outfits for enhanced comfort.

Additional tips for outdoor workers:

• The Occupational Safety and Health Administration (OSHA) recommends frequent rest breaks in shaded or air-conditioned areas for outdoor workers.
• If someone succumbs to the heat, promptly relocate them to a cool, shaded location.
• In emergencies, call 911 for immediate assistance.

These NWS heat safety recommendations are vital for your well-being during periods of high temperatures. Stay informed and take the necessary steps to protect yourself and others from the heat's potentially dangerous effects.

Advance Local Weather Alerts is a service provided by United Robots, which uses machine learning to compile the latest data from the National Weather Service.