January 26 – This is a follow up to my last report about the light rain moving into freezing temperatures. As suggested, this is becoming an issue father south and east. So the National Weather Service has expanded the Freezing Rain Advisory to include central Maryland. This includes Frederick, Carroll, Howard, northern Montgomery, Baltimore and Harford Counties until 11 AM. By the time it reaches Cecil County it should warm above freezing. The southern Pennsylvania Advisory is still in effect until 9 AM
All it takes is a little glaze to cause a big problem. There are pockets of mixed air in the region, so you might have warmer air at your house, and if you can get out to travel, you might run into icy spots along the way.
Temps at 7 AM
There are pockets of mild air, but also places well below freezing. The ground is frozen as well. So please don’t take the temperatures as the only. Notice the spread of 36°F in Westminster to 21°F in York. Plenty of spots in between that might be well below freezing. Also, the air could warm to 32°F but the ground could remain frozen.
This is light precipitin, but just enough to develop a glaze. This simulation is not perfect. Watching the radar as it passes through is most prudent.