Heat Advisory: District of Columbia; Frederick; Carroll; Northern Baltimore; Cecil; Southern Baltimore; Prince Georges; Anne Arundel; Charles; St. Marys; Calvert; Northwest Montgomery; Central and Southeast Montgomery; Northwest Howard; Central and Southeast Howard; Northwest Harford; Southeast Harford; Rappahannock; Culpeper; Fairfax; Arlington/Falls Church/Alexandria; Stafford; Spotsylvania; King George; Northern Fauquier; Southern Fauquier; Western Loudoun; Eastern Loudoun; Northwest Prince William; Central and Southeast Prince William/Manassas/Manassas Park

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Heat Advisory — District of Columbia; Frederick; Carroll; Northern Baltimore; Cecil; Southern Baltimore; Prince Georges; Anne Arundel; Charles; St. Marys; Calvert; Northwest Montgomery; Central and Southeast Montgomery; Northwest Howard; Central and Southeast Howard; Northwest Harford; Southeast Harford; Rappahannock; Culpeper; Fairfax; Arlington/Falls Church/Alexandria; Stafford; Spotsylvania; King George; Northern Fauquier; Southern Fauquier; Western Loudoun; Eastern Loudoun; Northwest Prince William; Central and Southeast Prince William/Manassas/Manassas Park Severity: Moderate. Certainty: Likely. * WHAT...Heat index values up to 105 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...From 11 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.