I've been working in FCPS for over 25 years. They fluctuate in their closings, but they have been burned many times by forecasts of snow that ended up as cold rain. Then parents get pissed. So they often do a delay with a re-evaluation for closing. If the NWS would give us a WARNING, they would go ahead and close. But don't worry. They will probably change it later this evening to give parents a heads-up.