Overview

• The heat advisory for 14 counties in southeast Pennsylvania expired at 8 p.m. Wednesday after heat indices cooled below warning thresholds.
• Officials canceled heat warnings for the Lower Columbia Basin, Northern and Southern Blue Mountain foothills, Eastern Columbia River Gorge and north central Oregon early Thursday.
• The National Weather Service urges residents to stay hydrated, seek air-conditioned shelter and avoid sun exposure during high temperatures.
• Federal warnings stress never leaving young children or pets unattended in cars, where interior temperatures can become lethal within minutes.
• OSHA recommends that outdoor workers take regular rest breaks in shaded or air-conditioned areas to prevent heat-related illnesses.