An extended stretch of above average heat starts today across the region. Daytime highs will top 90 daily in the afternoon, and approach 100 by the middle of the week, with heat index values 5-10 degrees warmer than the actual air temperature. A heat advisory starts Tuesday afternoon, according to the National Weather Service. Take extra precautions when working or spending time outside. When possible, reschedule strenuous activities to early morning or evening. Residents should also know the signs and symptoms of heat exhaustion and heat stroke and wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location.