Radar & lightning: Latest D.C. area radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

7:30 p.m. Update: Bit of a shocker from the Office of Personnel Management - OPM has already announced that D.C. area federal agencies will open tomorrow under an 11 a.m. delayed arrival, and employees have the option for unscheduled leave or telework. More details here.

Also, here’s our SchoolCast for tomorrow:

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And yes, we know several area school systems have professional days previously scheduled for tomorrow. But hey, teachers care about SchoolCast too, right?

3:15 p.m.: Here’s the scoop on the Freezing Rain Advisory issued by the National Weather Service. It covers the entire metro area except for St. Mary’s County. And it’s in effect from 4 p.m. today until 6 a.m. Monday for southern and eastern parts of the area (D.C., Prince George’s, Fairfax, Prince William, southern Fauquier counties and points south and east), and until 9 a.m. Monday for northern and western parts (Montgomery, Loudoun, Howard, northern Fauquier counties and points north and west).

Temperatures this afternoon remain near or below freezing area-wide with areas of mist and maybe a flurry. Freezing drizzle or light freezing rain this evening into early tomorrow morning could create light icing (less than .10” expected), especially on untreated and/or elevated surfaces. Areas most likely to see slick spots last into the Monday a.m. commute are those north and west of the Beltway, where temperatures will take longest to rise above the freezing mark.

We’ll issue a SchoolCast this evening if warranted. For more forecast details, see our full forecast through midweek.