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 Post subject: NARR Relative Humidity
PostPosted: Mon Feb 26, 2007 8:12 pm 
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Joined: Sat Aug 07, 2004 12:57 am
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Location: North Carolina
All,

I want to display relative humidity when working with data from the North American Regional Reanalysis model. Since this parameter is not included in the data set (except for just a few levels) I must calculate it from the available data. I have thus far had no success in doing this. If anyone can help me out here with this it will be greatly appreciated.

Thank you,

Kevin


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PostPosted: Tue Feb 27, 2007 12:27 am 
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Kevin,

What levels and exactly what data are getting, as in is it RH for specific levels, temp and dew points, etc.


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PostPosted: Wed Feb 28, 2007 11:49 am 
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Kevin,

If you could post a copy of the grid inventory from the WINGRIDDS.LOG file, that would be most helpful.

Thanks,
Jeff


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PostPosted: Thu Mar 01, 2007 3:30 am 
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Jeff,

Here ya go!

Code:
 V:WNG-BR22   --GRID FILE 1 (FIL1) --> MAY059318A.NAR255                       
 MODEL=NARA FROM 1993/05/05/18    LISTING FOR FHR=  0
 PARAMETERS SET TO:   LEVEL= 850   LAYER=1000/ 500   FHRS=  0/ 24
 UGRDHYB1 VGRDHYB1 VVELHYB1 TKENHYB1 BMXLHYB1 MSG0 SFC MSG1 SFC ALAT SFC
 ALON SFC DMAP SFC FFFF SFC EDIR SFC GRDX SFC GRDY SFC VISB SFC HPBL SFC
 TEMP SFC PRES SFC SWET SFC THTA SFC TSOL SFC SOLM SFC PCSW SFC SWAT SFC
 PSNC SFC SNDP SFC FRCV SFC DRAG SFC EXGC SFC VEGT SFC XGRD SFC VDHR SFC
 VDZA SFC VDMA SFC VDMR SFC LIFT SFC CAPE SFC CINH SFC PWAT SFC 4LIX SFC
 ALBD SFC UGRD 100 VGRD 100 VVEL 100 HGHT 100 TEMP 100 SPFH 100 CWMR 100
 ICMR 100 UGRD 125 VGRD 125 VVEL 125 HGHT 125 TEMP 125 SPFH 125 CWMR 125
 ICMR 125 UGRD 150 VGRD 150 VVEL 150 HGHT 150 TEMP 150 SPFH 150 CWMR 150
 ICMR 150 UGRD 175 VGRD 175 VVEL 175 HGHT 175 TEMP 175 SPFH 175 CWMR 175
 ICMR 175 UGRD 200 VGRD 200 VVEL 200 HGHT 200 TEMP 200 SPFH 200 CWMR 200
 ICMR 200 UGRD 225 VGRD 225 VVEL 225 HGHT 225 TEMP 225 SPFH 225 CWMR 225
 ICMR 225 UGRD 250 VGRD 250 VVEL 250 HGHT 250 TEMP 250 SPFH 250 CWMR 250
 ICMR 250 UGRD 275 VGRD 275 VVEL 275 HGHT 275 TEMP 275 SPFH 275 CWMR 275
 ICMR 275 UGRD 300 VGRD 300 VVEL 300 HGHT 300 TEMP 300 SPFH 300 CWMR 300
 ICMR 300 UGRD 350 VGRD 350 VVEL 350 HGHT 350 TEMP 350 SPFH 350 CWMR 350
 ICMR 350 UGRD 400 VGRD 400 VVEL 400 HGHT 400 TEMP 400 SPFH 400 CWMR 400
 ICMR 400 UGRD 450 VGRD 450 VVEL 450 HGHT 450 TEMP 450 SPFH 450 CWMR 450
 ICMR 450 UGRD 500 VGRD 500 VVEL 500 HGHT 500 TEMP 500 SPFH 500 CWMR 500
 ICMR 500 UGRD 550 VGRD 550 VVEL 550 HGHT 550 TEMP 550 SPFH 550 CWMR 550
 ICMR 550 UGRD 600 VGRD 600 VVEL 600 TKEN 600 HGHT 600 TEMP 600 SPFH 600
 CWMR 600 ICMR 600 UGRD 650 VGRD 650 VVEL 650 TKEN 650 HGHT 650 TEMP 650
 SPFH 650 CWMR 650 ICMR 650 UGRD 700 VGRD 700 VVEL 700 TKEN 700 HGHT 700
 TEMP 700 SPFH 700 CWMR 700 ICMR 700 UGRD 725 VGRD 725 VVEL 725 TKEN 725
 HGHT 725 TEMP 725 SPFH 725 CWMR 725 ICMR 725 UGRD 750 VGRD 750 VVEL 750
 TKEN 750 HGHT 750 TEMP 750 SPFH 750 CWMR 750 ICMR 750 UGRD 775 VGRD 775
 VVEL 775 TKEN 775 HGHT 775 TEMP 775 SPFH 775 CWMR 775 ICMR 775 UGRD 800
 VGRD 800 VVEL 800 TKEN 800 HGHT 800 TEMP 800 SPFH 800 CWMR 800 ICMR 800
 UGRD 825 VGRD 825 VVEL 825 TKEN 825 HGHT 825 TEMP 825 SPFH 825 CWMR 825
 ICMR 825 UGRD 850 VGRD 850 VVEL 850 TKEN 850 HGHT 850 TEMP 850 SPFH 850
 CWMR 850 ICMR 850 HQDV 850 UGRD 875 VGRD 875 VVEL 875 TKEN 875 HGHT 875
 TEMP 875 SPFH 875 CWMR 875 ICMR 875 UGRD 900 VGRD 900 VVEL 900 TKEN 900
 HGHT 900 TEMP 900 SPFH 900 CWMR 900 ICMR 900 UGRD 925 VGRD 925 VVEL 925
 TKEN 925 HGHT 925 TEMP 925 SPFH 925 CWMR 925 ICMR 925 UGRD 950 VGRD 950
 VVEL 950 TKEN 950 HGHT 950 TEMP 950 SPFH 950 CWMR 950 ICMR 950 UGRD 975
 VGRD 975 VVEL 975 TKEN 975 HGHT 975 TEMP 975 SPFH 975 CWMR 975 ICMR 975
 UGRD1000 VGRD1000 VVEL1000 TKEN1000 HGHT1000 TEMP1000 SPFH1000 CWMR1000
 ICMR1000 VSMC  5U CSUS  5U VSMC 25U CSUS 25U VSMC 70U CSUS 70U VSMC150U
 CSUS150U MOSA 50U TEMP  2M SPFH  2M PRES  2M DWPT  2M RELH  2M UGRD 10M
 VGRD 10M TEMP 10M SPFH 10M PRES 10M THTA 10M UGRD 30M VGRD 30M TEMP 30M
 SPFH 30M PRES 30M THTA 30M HGHTCBAS PRESCBAS HGHTCTOP TEMPCTOP PRESCTOP
 HLCYM015 USTMM030 VSTMM030 UGRDTROP VGRDTROP HGHTTROP TEMPTROP PRESTROP
 VSSHTROP UGRDMAXW VGRDMAXW HGHTMAXW PRESMAXW HGHT0DEG RELH0DEG UGRDB015
 VGRDB015 VVELB015 TEMPB015 SPFHB015 HQDVB015 UGRDB045 VGRDB045 VVELB045
 TEMPB045 SPFHB045 HQDVB045 UGRDB075 VGRDB075 VVELB075 TEMPB075 SPFHB075
 HQDVB075 UGRDB105 VGRDB105 VVELB105 TEMPB105 SPFHB105 HQDVB105 UGRDB135
 VGRDB135 VVELB135 TEMPB135 SPFHB135 HQDVB135 UGRDB165 VGRDB165 VVELB165
 TEMPB165 SPFHB165 HQDVB165 CAPEB090 CINHB090 PRESCLVL


Here is a link to the grib inventory for the NARR

http://nomads.ncdc.noaa.gov/docs/narr_archive_contents.pdf

Thank you,

Kevin


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PostPosted: Thu Mar 01, 2007 12:28 pm 
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Kevin,

Aaaaahhhhh.....there is the problem. What are those SPFH parameters at every level? Must be some sort of Specific Humidity which they have put in the place of regular RELH, DWPT or MIXR. WINGRIDDS does not know to look for the SPFH if the other moisture parameters are missing.

Thanks for the info,
Jeff


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