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19990106: cloud ceiling...
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- Subject: 19990106: cloud ceiling...
- Date: Thu, 07 Jan 1999 10:42:27 -0700
>From: Maureen Ballard <address@hidden>
>Organization: UK Ag Weather Center
>Keywords: 199901062040.NAA27227
>Steve,
>
>Looking over some archived messages, I came across one concerning cloud
>ceilings. At that time (back in 95) there was no GEMPAK parameter for
>cloud ceiling. I also have not found mention of one in the manual help
>pages. Has one been created or in the plans? We are interested in
>plotting these values on a map. If a parameter for cloud ceiling is not
>planned I guess I'll start figuring out a way to calculate it from the
>cloud groups.
>
>Any help would be greatly appreciated.
>
>Thanks!
>
>Maureen
>
Maureen,
At the end of this message, you will find the source for a routine I
created $GEMPAKHOME/src/gemlib/pr/prceil.f
Place the routine in the above mentioned directory, and add the
(tab) $(ALIB)/(prceil.o) \
target to the makefile in that directory, and just as you did for
the soil moisutre routine, add the appropriate invocation to
the $GEMPAKHOME/src/gemlib/pc/pcfunc.f routine:
C*
ELSE IF ( fff .eq. 'PR_CMBC' ) THEN
data ( iout (i) ) = PR_CMBC ( d1, d2, d3)
C*
ELSE IF ( fff .eq. 'PR_CEIL' ) THEN <--- add these 2 lines
data ( iout (i) ) = PR_CEIL ( d1, d2, d3) <--/
C*
ELSE IF ( fff .eq. 'PR_RWSH' ) THEN
data ( iout (i) ) = PR_RWSH ( d1 )
Compile these two routines
cd $GEMPAKHOME/src/gemlib/pr
make clean
make
make clean
cd $GEMPAKHOME/src/gemlib/pc
make clean
make
make clean
Next, add some variables to the $GEMTBL/parms/pcconv.tbl to the
end of the cloud parameter section, eg:
<clip>
CSYM = PR_CSYM ( CTYM )
CSYH = PR_CSYH ( CTYH )
CSYT = PR_CSYT ( CTYL, CTYM, CTYH )
CEIL = PR_CEIL ( CHC1, CHC2, CHC3 ) <--- add these three lines
CEIO = PT_CMCL ( CEIL ) <--/
CEIH = PR_CLHX ( CEIL ) <--/
Now, just recompile the surface programs like sflist, sfmap etc
cd $GEMPAKHOME/src/programs/sf
make clean
make all
make install
make clean
The ceiling routine will chose the lowest level with at least broken
cloud cover (broken, overcast, obscured).
CEIL is similar to the COMT variable, giving the combined cloud height*10 +
coverage.
CEIO is similar to CLDT giving the old SA abbreviation form, and CEIH
will return just the height (in 100s of feet) like CLHx.
For example:
PARM = CHC1;CHC2;CHC3;CEIL;CEIO;CEIH
STN YYMMDD/HHMM CHC1 CHC2 CHC3 CEIL CEIO CEIH
BWG 990106/1200 202.00 244.00 -9999.00 244.00 24O 24.00
CVG 990106/1200 324.00 -9999.00 -9999.00 324.00 32O 32.00
FFT 990106/1200 262.00 394.00 -9999.00 394.00 39O 39.00
FTK 990106/1200 224.00 -9999.00 -9999.00 224.00 22O 22.00
HOP 990106/1200 152.00 304.00 -9999.00 304.00 30O 30.00
JKL 990106/1200 284.00 -9999.00 -9999.00 284.00 28O 28.00
LEX 990106/1200 302.00 553.00 704.00 553.00 55B 55.00
LOU 990106/1200 264.00 -9999.00 -9999.00 264.00 26O 26.00
LOZ 990106/1200 183.00 333.00 604.00 183.00 18B 18.00
OWB 990106/1200 184.00 -9999.00 -9999.00 184.00 18O 18.00
PAH 990106/1200 304.00 -9999.00 -9999.00 304.00 30O 30.00
SDF 990106/1200 264.00 -9999.00 -9999.00 264.00 26O 26.00
SME 990106/1200 212.00 304.00 -9999.00 304.00 30O 30.00
Steve Chiswell
<<------------Source for prceil.f----------------->
REAL FUNCTION PR_CEIL ( chc1, chc2, chc3 )
C************************************************************************
C* PR_CEIL *
C* *
C* This routine determines the height of the cloud ceiling. The ceiling *
C* is the lowest level with at least Broken Cloud cover. *
C* *
C* PR_CEIL ( CHC1, CHC2, CHC3 ) *
C* *
C* Input parameters: *
C* CHC1, CHC2, CHC3 REAL Combined cloud height/coverage *
C* *
C* Output parameters: *
C* PR_CEIL REAL Ceiling Height *
C** *
C* Log: *
C* Chiz/Unidata 1/99 *
C************************************************************************
INCLUDE 'GEMINC:GEMPRM.PRM'
REAL chc1,chc2,chc3
REAL height
INTEGER ctype
C*
INCLUDE 'GEMINC:ERMISS.FNC'
C------------------------------------------------------------------------
PR_CEIL = RMISSD
C
C* Check for missing data.
C
if ( .not. ERMISS ( chc1 ) ) then
height = float(int(chc1) / 10)
ctype = mod(INT(chc1),10)
if((ctype.eq.3).or.(ctype.eq.7).or.
+ (ctype.eq.4).or.(ctype.eq.8).or.
+ (ctype.eq.5).or.(ctype.eq.9)) then
PR_CEIL = chc1
RETURN
endif
endif
if ( .not. ERMISS ( chc2 ) ) then
height = float(int(chc2) / 10)
ctype = mod(INT(chc2),10)
if((ctype.eq.3).or.(ctype.eq.7).or.
+ (ctype.eq.4).or.(ctype.eq.8).or.
+ (ctype.eq.5).or.(ctype.eq.9)) then
PR_CEIL = chc2
RETURN
endif
endif
if ( .not. ERMISS ( chc3 ) ) then
height = float(int(chc3) / 10)
ctype = mod(INT(chc3),10)
if((ctype.eq.3).or.(ctype.eq.7).or.
+ (ctype.eq.4).or.(ctype.eq.8).or.
+ (ctype.eq.5).or.(ctype.eq.9)) then
PR_CEIL = chc3
RETURN
endif
endif
C*
RETURN
END
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