(Updated at 7:00 a.m.) Although temperatures are on the rise, a thin layer of ice has formed on some roads and sidewalks around Arlington this morning.

As a result of the freezing rain and potentially slippery conditions, Arlington Public Schools has decided to open on a two-hour delay.

The school system made the announcement just after 4:30 a.m.:

“All Arlington Public Schools will open two hours late today. All administrative offices will open on time. Essential employees should report to work as scheduled. Twelve month employees may take unscheduled leave or telework. Please communicate your plans with your supervisor. Morning field trips are canceled. The Extended Day program will also open two hours late. For updates about Pool Operations, go to www.apsva.us/aquatics. For information about Arlington County operations go to www.arlingtonva.us.”

APS caught some criticism from a TV meteorologist last night for not making its call sooner.

So far, no problems have been reported on roads in Arlington that were pre-treated. Reagan National Airport, meanwhile, reports that runways are “open and in good condition,” although some flights have been canceled.