Hi All

           I tried to run a simulation using RegCM-SVN6940 with dt = 100s and dx = 50 km for ERA15 Data.  But the run failed due to CFL Error. I tried with dt = 50 s,10 s. Still the  run failed. Then I tried to run the same namelist with  RegCM-4.7, then the model worked fine. Could you please help me to figure out the problem. The namelist used is attached below.

 MAXVAL ATEN T :   2.3538368754274890E+021
 WHUUUUBBBASAAAGASDDWD!!!!!!!!!!!!!!!!
 No more atmosphere here....
 CFL violation detected, so model STOP
 #####################################
 #            DECREASE DT !!!!       #
 #####################################
 -------------- FATAL CALLED ---------------
  Fatal in file: mod_tendency.F90 at line:      698
 CFL VIOLATION