Department of weather forecasts

TCDC: total cloudiness - grey-white shades - from clear sky (transparent) to cloudy (white);
APCP: precipitation type - blue shades within the cloud cover - rain; violet shades - snow; and 3-hour precipitation amount - color intensity;
850 mb temp: free air temperature at around 1500 m above sea level - color isolines;
500 mb: atmospheric flow in middle troposphere - white isolines of geopotential at 500 hPa;
LFIX: atmospheric instability by lifted index - dashed isolines.

For more information follow the link models