Figure 26.  The values used for this vector plot were taken from the RUC initial hour forecast at 06 UTC April 7 2003, during the time of the second MCS. The cell motion (governed by the mean 850mb - 300mb mean wind) nearly opposes the propagation motion (inversely proportional to the low level jet). This results in a very slow system speed. is the U.S. government's official web portal to all federal, state and local government web resources and services.