Zulu time (also called "Z" time) is the meteorological equivalent of Greenwich Mean Time, the time of day in Greenwich, England (which is a 0° longitude).
During Eastern Standard Time (EST), we are 5 hours behind Zulu time, and during Eastern Daylight Time (EDT), we are 4 hours behind.
So, at 12Z (noon in England), it is 7 AM EST, or 8 AM EDT in Virginia.
