The National Weather Service issued the advisory Wednesday afternoon, warning of heat index values of more than 100 degrees and an elevated risk of heat-related illness for those spending time outdoors between noon and 8 p.m.

Those who are sensitive to the heat or performing outdoor activities should take proper precautions, authorities say.


Arlington County and the rest of the D.C. metropolitan area is under a Code Orange alert today (Friday) for its air quality.

With temperatures and humidity expected to build today and continue through the Fourth of July holiday, the Metropolitan Washington Council of Governments issued its alert, warning that sensitive groups could be affected and should avoid strenuous activity or outdoor exercise.


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