A band of heavy snow developed along an east-west oriented low-level trough axis within a large area of light snow on the west side of a deep cyclone.
The band was associated with strong low-level frontogenesis (centered around 900 mb).
The strong temperature gradient associated with the frontogenesis was difficult to detect using surface observations, due to terrain effects. The gradient was much stronger at 900 mb.
The NAM model accurately forecast the intensity and location of the frontogenesis 24 hours prior to its development.
However, the NAM QPF apparently did not respond to the frontogenesis.
The NMM_WRF reflectivity product also accurately forecast the position of the band 24 hours prior to its development.