There remains some uncertainty about the expected light snowfall late Thursday night into Friday morning.
The latest NAM continues with a very low QPF for Philadephia, only 0.07 inches water. The GFS has been consistently higher at 0.24 inches water.
My impression is that the low QPF of the NAM is more likely correct. That means about a dusting to an inch by 9 AM Friday morning. More south of the city and into Delaware and less north and west of the city. I’ll update if things change.
Do you think whatever snow we get tonight will be the kind that just sticks to grassy surfaces, or are we looking at snow-covered streets?
This snow will start during the nighttime. Accumulation will likely occur on ALL surfaces into the early morning. The effects of the insolation through the clouds will manifest itself after sunrise, where melting will occur on the roadways and any additional accumulation, if any, will be on grassy surfaces.