Changes in the models……Last night’s models show a less-sharply amplified upper air configuration., allowing faster movement of the expected coastal low and less of a track hugging the coastline.  We still get some light snow Saturday evening and night possibly accumulating mostly on grassy surfaces, but right now, less precipitation lingers into Sunday.

Interesting winter to spring weather, but NOT a snowstorm in any sense of the word.  I’ll update later tonight.

Fri Noon Update- Precip starts late afternoon or evening Saturday, may start as rain or rain mixed with snow.  Temperatures in the upper atmosphere support snow after midnight Saturday, but near surface temperatures (and ground temperatures) will be at or just above freezing.  The thermal profile supports snow Sunday morning, and some grassy accumulation possible, but insolation through the clouds will limit accumulation on roadways considerably.

So, when the atmosphere is cold enough for snow by daybreak Sunday, conditions will be marginal to allow accumulation.  The best type of snow- looks pretty, little accumulation.

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.