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20041011: CAPE computation in GEMPAK
- Subject: 20041011: CAPE computation in GEMPAK
- Date: Mon, 11 Oct 2004 16:48:41 -0600
Donna,
The sounding below has a few quirks, including the botched
lat/lon and station elevation.
The CAPE/CINS cannot be calculated from the sounding due to
the embedded missing data levels. It seems that somehow
along the way you have moved from a merged sounding to an unmerged
sounding. Dun-no.
At any rate, the sounding could be cleaned up by hand, but just as easy
to download the raw data from FSL's archive:
ZCZC
USUS80 KWBC 201200
BMXMANBMX
72230 TTAA 70121 72230 99992 23405 26004 00108 ///// /////
92794 27264 ///// 85536 22262 27512 70180 07456 27514 50587
08971 28520 40756 20979 31023 30962 37173 27034 25086 41377
27042 20234 51975 28536 15416 63571 26518 10659 73965 30005
88999 77999
NNNN
ZCZC
USUS80 KWBC 201200
BMXSGLBMX
72230 TTBB 7012/ 72230 00992 23405 11960 23412 22936 24056
33917 27665 44711 08022 55684 07066 66666 06473 77658 05258
88578 04322 99567 03172 11558 02384 22408 20572 33392 21384
44243 41978 55141 65969
NNNN
ZCZC
USUS80 KWBC 201200
BMXSGLBMX
PPBB 70120 72230 90046 26004 28511 26513 90789 26014 26014
26013 91245 28513 27013 26014 916// 27518 92045 29019 32023
30523 93015 28029 27530 26541 938// 28044 94245 28536 28025
26020 947// 27516 9504/ 33014 31003
NNNN
I converted the above with dcuair:
cat bmx | dcuair -c 990820/1200 -d - YYYYMMDDHH.gem
Now running snlist gives the values you mentioned:
SNPARM = PRES;HGHT;TMPC;DWPC;RELH;DRCT;SKNT
STNPRM = CAPE;CINS
STID = BMX STNM = 72230 TIME = 990820/1200
SLAT = 33.16 SLON = -86.76 SELV = 178.0
STIM = 1200
CAPE = 1936.18 CINS = -232.60
PRES HGHT TMPC DWPC RELH DRCT SKNT
992.00 178.00 23.40 22.90 97.02 260.00 4.00
1000.00 108.00 -9999.00 -9999.00 -9999.00 -9999.00 -9999.00
960.00 466.66 23.40 22.20 92.98 266.93 5.94
936.00 689.51 24.00 18.00 69.14 272.28 7.44
925.00 794.00 27.20 13.20 42.03 274.77 8.13
917.00 870.82 27.60 12.60 39.47 276.61 8.65
881.30 1219.00 24.77 11.34 42.95 285.00 10.99
850.00 1536.00 22.20 10.20 46.49 275.00 12.00
821.15 1829.00 19.45 9.35 52.00 265.00 13.00
792.16 2134.00 16.60 8.46 58.63 260.00 14.01
764.28 2438.00 13.75 7.58 66.31 260.00 14.01
737.30 2743.00 10.89 6.70 75.32 260.00 13.00
711.00 3051.21 8.00 5.80 85.99 270.49 13.70
700.00 3180.00 7.40 1.40 65.70 275.00 14.01
684.00 3370.47 7.00 -9.00 30.98 278.98 13.60
666.00 3589.45 6.40 -16.60 17.46 283.56 13.14
660.45 3658.00 5.57 -7.04 39.80 285.00 13.00
658.00 3688.42 5.20 -2.80 56.27 284.26 13.00
612.31 4267.00 -0.07 -4.85 70.19 270.00 13.00
589.51 4572.00 -2.85 -5.94 79.30 260.00 14.01
578.00 4730.51 -4.30 -6.50 84.62 267.73 16.07
567.39 4877.00 -3.14 -24.43 17.56 275.00 18.01
567.00 4882.45 -3.10 -25.10 16.48 275.05 18.02
558.00 5009.30 -2.30 -36.30 5.35 276.32 18.27
500.00 5870.00 -8.90 -29.90 16.48 285.00 20.01
485.33 6096.00 -10.60 -31.75 15.80 290.00 19.00
413.31 7315.00 -19.76 -41.70 12.36 320.00 23.00
408.00 7413.22 -20.50 -42.50 12.10 316.05 23.00
400.00 7560.00 -20.90 -49.90 5.53 310.00 23.00
396.76 7620.00 -21.06 -52.07 4.36 305.00 23.00
392.00 7709.12 -21.30 -55.30 3.03 303.58 23.34
320.67 9144.00 -33.16 -58.90 5.77 280.00 29.00
307.27 9449.00 -35.69 -59.67 6.71 275.00 29.99
300.00 9620.00 -37.10 -60.10 7.32 270.00 33.99
257.16 10668.00 -40.65 -67.03 4.20 265.00 41.01
250.00 10860.00 -41.30 -68.30 3.77 270.00 42.00
243.00 11052.20 -41.90 -69.90 3.20 272.62 42.52
224.29 11582.00 -46.01 -72.78 3.28 280.00 44.00
200.00 12340.00 -51.90 -76.90 3.44 285.00 35.99
185.92 12802.00 -54.84 -78.83 3.61 285.00 35.99
168.85 13411.00 -58.73 -81.37 3.87 280.00 25.00
160.91 13716.00 -60.67 -82.65 4.01 260.00 20.01
150.00 14160.00 -63.50 -84.50 4.25 265.00 18.01
145.99 14326.00 -64.55 -84.68 4.75 275.00 16.01
141.00 14538.83 -65.90 -84.90 5.49 287.56 15.55
125.37 15240.00 -68.63 -86.27 6.33 330.00 14.01
102.22 16459.00 -73.39 -88.64 8.28 310.00 2.99
100.00 16590.00 -73.90 -88.90 8.53 300.00 4.99
Steve Chiswell
Unidata User Support
>From: address@hidden
>Organization: UCAR/Unidata
>Keywords: 200410112139.i9BLdbUE015867
>----------
>X-Sun-Data-Type: text
>X-Sun-Data-Description: text
>X-Sun-Data-Name: text
>X-Sun-Charset: us-ascii
>X-Sun-Content-Lines: 14
>
>I have a favorite sounding I like to use to illustrate stability
>parameters. It got so dogeared that I wanted to replot it. My
>original GEMPAK plot (version unknown) calculates the CAPE as 1936
>and the CINS as 233. The plot I just made gives zero for both
>parameters. Has the algorithm for calculating CAPE changed? This
>sounding is so unstable that it seems that it would have positive
>CAPE no matter how you calculate it. Edit file of sounding is
>attached.
>
>Donna Tucker 1475 Jayhawk Blvd.
>Associate Professor 213 Lindley Hall
>address@hidden Department of Geography
>(785) 864-4738 University of Kansas
>
>(785) 864-5378 (fax) Lawrence, KS 66045-7613
>
>----------
>X-Sun-Data-Type: default
>X-Sun-Data-Description: default
>X-Sun-Data-Name: demo.gem
>X-Sun-Charset: us-ascii
>X-Sun-Content-Lines: 52
>
>SNPARM = pres;hght;tmpc;dwpc;relh;drct;sknt
> STID = BMX STNM = 53823 TIME = 990820/1200
> SLAT = 33.10000 SLON = -0.00000 SELV = -4262372
> PRES HGHT TMPC DWPC RELH DRCT SKNT
> 992.00 178.00 23.40 22.90 96.96 260.00 4.08
> 1000.00 108.00 -9999.00 -9999.00 -9999.00 -9999.00 -9999.00
> 960.00 462.00 23.40 22.20 92.84 -9999.00 -9999.00
> 936.00 681.00 24.00 18.00 68.65 -9999.00 -9999.00
> 925.00 794.00 27.20 13.20 41.36 -9999.00 -9999.00
> 917.00 870.00 27.60 12.60 38.81 -9999.00 -9999.00
> 881.00 1219.00 -9999.00 -9999.00 -9999.00 285.00 11.08
> 850.00 1536.00 22.20 10.20 45.95 275.00 12.05
> 821.00 1828.00 -9999.00 -9999.00 -9999.00 265.00 13.02
> 792.00 2133.00 -9999.00 -9999.00 -9999.00 260.00 14.00
> 764.00 2438.00 -9999.00 -9999.00 -9999.00 260.00 14.00
> 736.00 2743.00 -9999.00 -9999.00 -9999.00 260.00 13.02
> 711.00 3039.00 8.00 5.80 85.89 -9999.00 -9999.00
> 700.00 3180.00 7.40 1.40 65.54 275.00 14.00
> 684.00 3369.00 7.00 -9.00 30.96 -9999.00 -9999.00
> 666.00 3587.00 6.40 -16.60 17.57 -9999.00 -9999.00
> 660.00 3657.00 -9999.00 -9999.00 -9999.00 285.00 13.02
> 658.00 3685.00 5.20 -2.80 56.19 -9999.00 -9999.00
> 612.00 4267.00 -9999.00 -9999.00 -9999.00 270.00 13.02
> 589.00 4572.00 -9999.00 -9999.00 -9999.00 260.00 14.00
> 578.00 4721.00 -4.30 -6.50 84.67 -9999.00 -9999.00
> 567.00 4872.00 -3.10 -25.10 16.85 -9999.00 -9999.00
> 567.00 4876.00 -9999.00 -9999.00 -9999.00 275.00 18.08
> 558.00 4998.00 -2.30 -36.30 5.65 -9999.00 -9999.00
> 500.00 5870.00 -8.90 -29.90 17.00 285.00 20.02
> 485.00 6096.00 -9999.00 -9999.00 -9999.00 290.00 19.05
> 413.00 7315.00 -9999.00 -9999.00 -9999.00 320.00 22.94
> 408.00 7405.00 -20.50 -42.50 12.91 -9999.00 -9999.00
> 400.00 7560.00 -20.90 -49.90 6.13 310.00 22.94
> 397.00 7620.00 -9999.00 -9999.00 -9999.00 305.00 22.94
> 392.00 7709.00 -21.30 -55.30 3.47 -9999.00 -9999.00
> 321.00 9144.00 -9999.00 -9999.00 -9999.00 280.00 28.97
> 307.00 9448.00 -9999.00 -9999.00 -9999.00 275.00 29.94
> 300.00 9620.00 -37.10 -60.10 8.37 270.00 34.02
> 257.00 10668.00 -9999.00 -9999.00 -9999.00 265.00 41.02
> 250.00 10860.00 -41.30 -68.30 4.58 270.00 41.99
> 243.00 11052.00 -41.90 -69.90 3.95 -9999.00 -9999.00
> 224.00 11582.00 -9999.00 -9999.00 -9999.00 280.00 43.93
> 200.00 12340.00 -51.90 -76.90 4.41 285.00 35.96
> 186.00 12801.00 -9999.00 -9999.00 -9999.00 285.00 35.96
> 169.00 13411.00 -9999.00 -9999.00 -9999.00 280.00 25.08
> 161.00 13716.00 -9999.00 -9999.00 -9999.00 260.00 20.02
> 150.00 14160.00 -63.50 -84.50 5.62 265.00 18.08
> 146.00 14326.00 -9999.00 -9999.00 -9999.00 275.00 15.94
> 141.00 14537.00 -65.90 -84.90 7.13 -9999.00 -9999.00
> 125.00 15240.00 -9999.00 -9999.00 -9999.00 330.00 14.00
> 102.00 16459.00 -9999.00 -9999.00 -9999.00 310.00 2.92
> 100.00 16590.00 -73.90 -88.90 10.91 300.00 5.05
>
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