Heat Advisory: Washington; Augusta; Rockingham; Shenandoah; Frederick; Page; Warren; Clarke; Morgan; Berkeley; Jefferson

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Heat Advisory — Washington; Augusta; Rockingham; Shenandoah; Frederick; Page; Warren; Clarke; Morgan; Berkeley; Jefferson Severity: Moderate. Certainty: Likely. * WHAT...For the Heat Advisory, heat index values up to 104 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 109 possible. * WHERE...Portions of north central Maryland, northwest and western Virginia, and the eastern panhandle of West Virginia. * WHEN...For the Heat Advisory, from 11 AM this morning to 8 PM EDT this evening. For the Extreme Heat Watch, from Thursday morning through Friday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Dangerous heat may linger into Saturday. Prolonged extreme heat could impact power, water, and transportation systems.