Great start! Heres some suggestions...

This is a great program, but some key data are missing!

First--please include the NAM model! Very important for North American users!

Second, please let us choose whether to contour or fill values! As a side note, it would be nice to layer these.

Third, here are additional data meteorologists would like to see: Vorticity, wind speeds (contoured), temperature, and heights at 850 mb, 700 mb, 500 mb (which you already have temp and heights for), 300 mb and 250 mb.

OUMeteorologist about WeatherTrack GRIB