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      SUBROUTINE special (flag,cmd,tra,ntim,ncol,
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      SUBROUTINE special (flag,cmd,tra,ntim,ncol,
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     >                    vars,times,param,nparam)
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     >                    vars,times,param,nparam)
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c     ***************************************************************************
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c     ***************************************************************************
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c     *                                                                         *
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c     *                                                                         *
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c     * OUTPUT:  flag           -> 1 if trajectory is selected, 0 if not        *
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c     * OUTPUT:  flag           -> 1 if trajectory is selected, 0 if not        *
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c     *                                                                         *
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c     *                                                                         *
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c     * INPUT:   cmd            <- command string                               *
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c     * INPUT:   cmd            <- command string                               *
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c     *          tra(ntim,ncol) <- single trajectory: indices time,column       *
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c     *          tra(ntim,ncol) <- single trajectory: indices time,column       *
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c     *          ntim           <- number of times                              *
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c     *          ntim           <- number of times                              *
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c     *          ncol           <- number of columns (including time,lon,lat,p) *
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c     *          ncol           <- number of columns (including time,lon,lat,p) *
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c     *          vars(ncol)     <- names of columns                             *
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c     *          vars(ncol)     <- names of columns                             *
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c     *          times(ntim)    <- List of times
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c     *          times(ntim)    <- List of times
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c     *          param(nparam)  <- parameter values                             *
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c     *          param(nparam)  <- parameter values                             *
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c     *          nparam         <- number of parameters                         *
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c     *          nparam         <- number of parameters                         *
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c     *                                                                         *
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c     *                                                                         *
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c     ***************************************************************************
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c     ***************************************************************************
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      implicit none
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      implicit none
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c     ---------------------------------------------------------------------------
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c     ---------------------------------------------------------------------------
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c     Declaration of subroutine parameters
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c     Declaration of subroutine parameters
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c     ---------------------------------------------------------------------------
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c     ---------------------------------------------------------------------------
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      integer       flag           ! Boolean flag whether trajectory is selected
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      integer       flag           ! Boolean flag whether trajectory is selected
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      character*80  cmd            ! Command string
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      character*80  cmd            ! Command string
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      integer       ntim,ncol      ! Dimension of single trajectory
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      integer       ntim,ncol      ! Dimension of single trajectory
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      real          tra(ntim,ncol) ! Single trajectory
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      real          tra(ntim,ncol) ! Single trajectory
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      character*80  vars(ncol)     ! Name of columns
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      character*80  vars(ncol)     ! Name of columns
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      real          times(ntim)    ! List of times
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      real          times(ntim)    ! List of times
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      integer       nparam         ! # parameters
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      integer       nparam         ! # parameters
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      real          param(nparam)  ! List of parameters
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      real          param(nparam)  ! List of parameters
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c     ---------------------------------------------------------------------------
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c     ---------------------------------------------------------------------------
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c     Declaration of local variables
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c     Declaration of local variables
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c     ---------------------------------------------------------------------------
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c     ---------------------------------------------------------------------------
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      integer       i
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      integer       i
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      integer       ip,i0,i1
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      integer       ip,i0,i1
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c     --------------------------------------------------------------------------  %)
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c     --------------------------------------------------------------------------  %)
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c     SPECIAL:WCB:ascent,first,last                                               %)
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c     SPECIAL:WCB:ascent,first,last                                               %)
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c         : Detect Warm Conveyor Belts (WCB); the air stream must ascend at least %)
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c         : Detect Warm Conveyor Belts (WCB); the air stream must ascend at least %)
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c         : <ascent=param(1)> hPa between the two times <first=param(2)> and      %)
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c         : <ascent=param(1)> hPa between the two times <first=param(2)> and      %)
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c         : <last=param(3)>. Note, the lowest pressure is allowed to occur at any %)
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c         : <last=param(3)>. Note, the lowest pressure is allowed to occur at any %)
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c         : time between <first> and <last>.                                      %)
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c         : time between <first> and <last>.                                      %)
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c     --------------------------------------------------------------------------- %)
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c     --------------------------------------------------------------------------- %)
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      if ( cmd.eq.'WCB' ) then
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      if ( cmd.eq.'WCB' ) then
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c        Reset the flag for selection
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c        Reset the flag for selection
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         flag = 0
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         flag = 0
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c        Pressure is in the 4th column
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c        Pressure is in the 4th column
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         ip = 4
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         ip = 4
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c        Get times
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c        Get times
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         i0 = 0
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         i0 = 0
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         i1 = 0
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         i1 = 0
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         do i=1,ntim
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         do i=1,ntim
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            if ( param(2).eq.times(i) ) i0 = i
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            if ( param(2).eq.times(i) ) i0 = i
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            if ( param(3).eq.times(i) ) i1 = i
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            if ( param(3).eq.times(i) ) i1 = i
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         enddo
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         enddo
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         if ( (i0.eq.0).or.(i1.eq.0) ) then
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         if ( (i0.eq.0).or.(i1.eq.0) ) then
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            print*,' ERROR: invalid times in SPECIAL:WCB... Stop'
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            print*,' ERROR: invalid times in SPECIAL:WCB... Stop'
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            stop
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            stop
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         endif
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         endif
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c        Check for ascent
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c        Check for ascent
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         do i=i0+1,i1
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         do i=i0+1,i1
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            if ( ( tra(1,ip)-tra(i,ip) ) .gt. param(1) ) flag = 1
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            if ( ( tra(1,ip)-tra(i,ip) ) .gt. param(1) ) flag = 1
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         enddo
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         enddo
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      endif
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      endif
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c     ---------------------------------------------------------------------------
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c     ---------------------------------------------------------------------------
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      end
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      end