Cirrostratus or
                                                                                                                                                                  Cirrocumulus                           Cirrus
                                                                                                                            Altostratus or
                                                                                                                            Altocumulus

                                                                                              Nimbostratus                                               
                                                                     Stratus                                                       Snow
                          Fog /                                                                            Sleet                                          
                       ^Clearing                      _Rain       ^{Freezing Rain}                           
                                                          
                                                          Frontal Motion

               Warm Front

Possible Cloud Structure and Precipitation along a Warm Front

(Depending upon the temperatures of the two air masses and location of the zone of precipitation, there may be no transitions at all or the transitions may span any segment of the snow-sleet-freezing rain-rain sequence.  The case shown is one in which the entire range, snow-rain, is spanned.)