The officer died from an apparent, self-inflicted gunshot wound in the facility at 348 Campbell Avenue SW.
A microburst is a localized column of sinking air, or downdraft, within a thunderstorm and is usually less than 2 miles in diameter.
One person has died and two others were hurt in an ambulance crash in Alleghany County, according to Virginia State Police.
Salinas was arrested Tuesday and is being held at the Montgomery County Jail without bond. He was charged with forcible sodomy and rape.