Heat Advisory: District of Columbia; Cecil; Southern Baltimore; Prince Georges; Anne Arundel; Charles; St. Marys; Calvert; Central and Southeast Montgomery; Central and Southeast Howard; Southeast Harford; Albemarle; Greene; Madison; Orange; Culpeper; Fairfax; Arlington/Falls Church/Alexandria; Stafford; Spotsylvania; King George; Southern Fauquier; Central and Southeast Prince William/Manassas/Manassas Park

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Heat Advisory — District of Columbia; Cecil; Southern Baltimore; Prince Georges; Anne Arundel; Charles; St. Marys; Calvert; Central and Southeast Montgomery; Central and Southeast Howard; Southeast Harford; Albemarle; Greene; Madison; Orange; Culpeper; Fairfax; Arlington/Falls Church/Alexandria; Stafford; Spotsylvania; King George; Southern Fauquier; Central and Southeast Prince William/Manassas/Manassas Park Severity: Moderate. Certainty: Likely. * WHAT...Heat index values up to 105 expected. * WHERE...Washington DC, portions of central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...From 10 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.