00z HRRR, NAMX and NAM reflectivity at 09z (1 km on top, composite below)
Notes:
At 09z, the HRRR was indicating that heavier snow was just starting to reach south central New York, while the NAM and NAMX were farther north with the leading edge of the precipitation. Some bands of heavier precipitation can be seen on the NAM and NAMX forecasts over Pennsylvania.
Slide 37