Let it be noted that on March 7th, Adam Joseph and Cecily Tynan declared that winter is over and it won’t snow again this season. That’s a bold prediction, not supported by the current extended GFS model.
Philly Weekend Weather Forecast
A deep upper air trough over our area Saturday will bring cold temperatures. High on Saturday about 42. A weak area of vorticity will approach our area, causing cloudiness to increase by Saturday afternoon.
A chance of a snow shower or flurry very early Sunday morning, then partial clearing with a mix of sun and clouds. High 45.
Philly Winter Weather Update
A quick update. Latest NAM and GFS have come closer together in QPF. The afternoon runs have 0.12 (NAM) and 0.16 (GFS) falling as snow, mostly before 7 AM Friday. This translates into about 1-2 inches of snow, less north and west.
The tv weather people’s phrase, “mostly on grassy surfaces” doesn’t apply here. The snow will be falling during the night time hours– insolation through the clouds won’t be a factor until after sunrise, when the snow will be essentially over. Once the sun angle increases (behind the clouds), most snow on roadways will quickly melt, leaving any accumulations on grassy surfaces.
But those hitting the roads for an early commute will likely see some snow on untreated surfaces, since temperatures will be below freezing during the snowfall, especially north and west.
Fri 7 AM: The northernmost cutoff of the precip was sharp and here in the Chestnut Hill area, we hardly had more than a coating. (In this scenario, “on the grassy surfaces applied”, but not for reasons I had considered- too light snowfall.). It appears that just south and east of PHL airport, snowfall has been more significant. )