The models had under-played the light snow that has developed this morning.   Looking at what’s going on here….The snow is the result of a small area of mid-level  convergence and a localized area of isentropic lift that has developed right over the PHL area as an upper air disturbance moves through.

Short range models (NAM-based HRRR and the GFS-based LAMP hardly show this, but the LAMP has it ending about 9 AM.  Of course, they didn’t really get it right to begin with, so we’ll have to see.

Weather is so amazingly difficult to predict sometimes.