d the precipitation assume to be frozen?
              [logical, dimension(:,:)]

    dtemp     Temperature tendency [deg k/time step] 
              [real, dimension(:,:,nlev)]

    dqvap     Specific humidity of water vapor tendency [1/time step]
              [real, dimension(:,:,nlev)]

    duwnd     Zonal wind component tendency [m/s/time step]
              [real, dimension(:,:,nlev)]

    dvwnd     Meridional wind component tendency [m/s/time step]
              [real, dimension(:,:,nlev)]

    pres_