A Winter Weather Advisory is in effect from 10pm Wednesday night until 1pm Thursday for all of Montgomery County. Per the National Weather Service: “Freezing rain expected. Total ice accumulations of a glaze to around one tenth of an inch. Difficult travel conditions are possible. The hazardous conditions will likely impact the morning commute on
Thursday.”
In the images below, courtesy of Fox 5 and NBC 4, you’ll see that icing in in the central and northern part of the county (Gaithersburg is specifically marked both maps) is more significant than the lower part of the county. This means that the morning commute could wait her be pretty bad or not so bad, depending on your location. Last night’s pencil prediction can be seen here, with an updated pencil prediction and more details on timing and what to expect coming tonight.