Weekend Outlook

Thu 01/05 @ 7:34 PM —The latest GFS model shows over-running of moisture over a colder lower layer Sunday late afternoon and evening.

Critical thicknesses contours are all south of our area, indicating the precipitation type will be snow. However, note that the surface temperatures will be just above 32º in the immediate PHL area, significantly reducing snow accumulation to just a coating on grassy surfaces.

Thursday’s 18z GFS shows mostly light snow over our area between 5PM and 11 PM. Critical Thickness contours (red, magenta, purple) are all south of the area. Marginally above freezing temperatures will keep accumulations to only a coating on grassy surfaces. (Click on image for a larger view.)