Sunny skies today will allow for significant melting of snow. High temp about 50. A cold front moves through early evening, accompanied by clouds, possible a light scattered shower.
Cold high pressure builds in for Sunday. Despite it being Spring, it will be cold and windy. High temperature will be about 42 despite mostly sunny skies.
The latest run of the HRRR (High Resolution Rapid Refresh) model (which is based off of the NAM model) shows 4-6 inches of snow in the immediate Philadelphia and surrounding areas by 7 PM, with the greatest accumulations occurring between 3 and 7 PM.
I guess it’s taking that 0.47 QPF for the afternoon and assuming all snow at about a 1:10 ratio.
Don’t shoot the messenger.
Latest NAM data just became available. QPF values nearly the same, with the heaviest precip falling during the afternoon hours. Morning hours: 0.20 inches afternoon: 0.47, evening 0.06 water equivalent.
The trend is towards lower temperatures at the critical heights of 3000 and 6000 feet. Temperatures at these levels remain right at or below freezing and do not rise later. Temperatures in the upper atmosphere, as reflected by the 500 mb thickness level is marginal for snow, but still supports wet snow.
So maybe we do get that 4 or 5 inches on grassy surfaces just outside of the city. Roadways significantly less.