Soaring Guidance
Issued by NWS Pueblo, CO

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000
UXUS97 KPUB 111021
SRGPUB

Soaring Forecast
National Weather Service Pueblo, Colorado
0421 MDT Friday, July 11, 2014

This forecast is for Friday, July 11, 2014:

If the trigger temperature of 77.8 F/25.5 C is reached...then
   Thermal Soaring Index....................... Good
   Maximum rate of lift........................ 664 ft/min (3.4 m/s)
   Maximum height of thermals.................. 14181 ft MSL (7423 ft AGL)

Forecast maximum temperature................... 82.0 F/28.2 C
Time of trigger temperature.................... 1030 MDT
Time of overdevelopment........................ None
Middle/high clouds during soaring window....... None
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 9940 ft MSL (3183 ft AGL)
Thermal soaring outlook for Saturday 07/12..... Good

Wave Soaring Index............................. Poor
Wave Soaring Index trend (to 1800 MDT)......... No change
Height of stable layer (12-18K ft MSL)......... None
Weak PVA/NVA (through 1800 MDT)................ Weak PVA
Potential height of wave....................... 15629 ft MSL (8871 ft AGL)
Wave soaring outlook for Saturday 07/12........ Poor

Remarks...

Sunrise/Sunset.................... 05:43:10 / 20:25:58 MDT
Total possible sunshine........... 14 hr 42 min 47 sec (882 min 47 sec)
Altitude of sun at 13:04:31 MDT... 73.05 degrees

Upper air data from numerical model forecast valid on 07/11/2014 at 0600 MDT

Freezing level.................. 17022 ft MSL (10264 ft AGL)
Convective condensation level... 16332 ft MSL (9574 ft AGL)
Lifted condensation level....... 15475 ft MSL (8717 ft AGL)
Lifted index.................... -2.2
K index......................... +17.7

Height  Temperature  Wind  Wind Spd  Lapse Rate  ConvectionT  Thermal  Lift Rate
ft MSL  deg C deg F   Dir   kt  m/s  C/km F/kft  deg C deg F   Index    fpm  m/s
--------------------------------------------------------------------------------
 50000  -66.3 -87.3   235    3    2   2.7   1.5      M     M       M      M    M
 45000  -60.0 -76.0   190    5    3   6.7   3.7      M     M       M      M    M
 40000  -49.9 -57.8   170    7    4   6.8   3.7      M     M       M      M    M
 38000  -45.8 -50.4   160    5    3   6.8   3.7      M     M       M      M    M
 36000  -41.7 -43.1   140    3    2   7.2   3.9      M     M       M      M    M
 34000  -37.1 -34.8   235    1    1   7.8   4.3      M     M       M      M    M
 32000  -31.8 -25.2   280    5    2   8.4   4.6   44.5 112.2    12.7      M    M
 30000  -27.4 -17.3   275    7    4   7.4   4.1   42.5 108.5    11.3      M    M
 29000  -25.2 -13.4   275    8    4   7.4   4.1   41.7 107.0    10.8      M    M
 28000  -23.0  -9.4   270    9    5   7.3   4.0   40.8 105.5    10.3      M    M
 27000  -20.8  -5.4   255   10    5   7.3   4.0   39.8 103.7     9.6      M    M
 26000  -18.6  -1.5   245   12    6   7.3   4.0   39.0 102.2     9.0      M    M
 25000  -16.4   2.5   240   13    7   6.7   3.7   38.2 100.8     8.4      M    M
 24000  -14.4   6.1   230   14    7   6.4   3.5   36.9  98.4     7.5      M    M
 23000  -12.4   9.7   220   14    7   6.5   3.6   35.7  96.3     6.6      M    M
 22000  -10.5  13.1   210   15    8   6.4   3.5   34.7  94.4     5.9      M    M
 21000   -8.6  16.5   205   12    6   6.4   3.5   33.4  92.1     4.8      M    M
 20000   -6.7  19.9   195    9    5   6.4   3.5   32.3  90.1     3.8      M    M
 19500   -5.7  21.7   185    8    4   6.5   3.6   31.7  89.1     3.4      M    M
 19000   -4.7  23.5   180    8    4   7.5   4.1   31.3  88.3     3.0      M    M
 18500   -3.6  25.5   185    7    4   7.5   4.1   30.9  87.6     2.6      M    M
 18000   -2.5  27.5   185    7    3   7.9   4.3   30.5  86.9     2.2      M    M
 17500   -1.4  29.5   185    7    4   8.1   4.4   30.2  86.4     1.9      M    M
 17000   -0.2  31.6   185    8    4   8.2   4.5   30.0  85.9     1.6      M    M
 16500    1.0  33.8   185    9    5   8.2   4.5   29.7  85.4     1.3      M    M
 16000    2.1  35.8   185   10    5   8.2   4.5   29.4  85.0     1.0      M    M
 15500    3.9  39.0   185   11    6   8.4   4.6   29.1  84.3     0.6      M    M
 15000    5.1  41.2   185   12    6   8.5   4.6   28.9  84.0     0.3      M    M
 14500    6.3  43.3   185   12    6   8.6   4.7   28.7  83.6     0.1      M    M
 14000    7.5  45.5   190   12    6   8.6   4.7   28.5  83.2    -0.1    635  3.2
 13500    8.8  47.8   190   13    7   8.5   4.7   28.3  82.9    -0.3    583  3.0
 13000   10.0  50.0   195   12    6   8.5   4.6   28.1  82.6    -0.6    531  2.7
 12500   11.2  52.2   195   11    6   8.2   4.5   27.9  82.3    -0.8    480  2.4
 12000   12.3  54.1   195    8    4   7.6   4.2   27.6  81.6    -1.2    433  2.2
 11750   12.8  55.0   190    7    4   7.4   4.0   27.4  81.3    -1.4    410  2.1
 11500   13.3  55.9   185    6    3   8.0   4.4   27.2  81.0    -1.6    387  2.0
 11250   13.9  57.0   175    4    2   7.6   4.2   27.1  80.8    -1.8    362  1.8
 11000   14.4  57.9   150    3    2   6.8   3.7   26.9  80.4    -2.0    340  1.7
 10750   14.9  58.8   120    3    2   7.0   3.8   26.7  80.0    -2.3    318  1.6
 10500   15.4  59.7   095    4    2   7.2   4.0   26.5  79.6    -2.5    295  1.5
 10250   15.9  60.6   080    5    2   7.8   4.3   26.3  79.3    -2.7    272  1.4
 10000   16.4  61.5   070    6    3   6.5   3.5   26.1  79.0    -3.0    250  1.3
  9750   16.8  62.2   060    7    4   5.3   2.9   25.8  78.4    -3.3    230  1.2
  9500   17.2  63.0   055    8    4   5.5   3.0   25.5  77.8    -3.7    211  1.1
  9250   17.6  63.7   045    9    5   5.3   2.9   25.1  77.2    -4.0    193  1.0
  9000   18.0  64.4   040   10    5   5.2   2.9   24.8  76.6    -4.4    174  0.9
  8750   18.3  64.9   030   10    5   5.5   3.0   24.4  76.0    -4.8    156  0.8
  8500   18.7  65.7   020   11    6   4.1   2.2   24.1  75.4    -5.1    136  0.7
  8250   18.9  66.0   005   11    6   2.9   1.6   23.6  74.5    -5.6    122  0.6
  8000   19.2  66.6   350   12    6   2.5   1.4   23.1  73.5    -6.2    109  0.6
  7750   19.4  66.9   340   14    7   4.7   2.6   22.6  72.6    -6.7     95  0.5
  7500   19.4  66.9   335   14    7  -7.9  -4.4   22.0  71.6    -7.3     85  0.4
  7250   18.1  64.6   330   12    6 -21.9 -12.0   20.3  68.6    -9.0    118  0.6
  7000   16.7  62.1   320   10    5 -11.1  -6.1   18.6  65.6   -10.7    152  0.8
  6750      M     M     M    M    M     M     M      M     M       M      M    M

 * * * * * * Numerical weather prediction model forecast data valid * * * * * *

           07/11/2014 at 0900 MDT          |       07/11/2014 at 1200 MDT
                                           |
K index... +15.0  LI... -1.7               | K index... +17.0  LI... -3.5
CAPE... +280.8  CIN... -94.0               | CAPE... +698.7  CIN... -8.0
                                           |
Height Temperature  Wnd WndSpd  Lapse Rate | Temperature  Wnd WndSpd  Lapse Rate
ft MSL deg C deg F  Dir kt m/s  C/km F/kft | deg C deg F  Dir kt m/s  C/km F/kft
--------------------------------------------------------------------------------
 50000 -65.8 -86.4  185   8  4   3.0   1.7 | -66.4 -87.5  190  12  6   2.7   1.5
 45000 -59.0 -74.2  200  10  5   6.9   3.8 | -59.8 -75.6  200  15  8   7.1   3.9
 40000 -48.9 -56.0  195  12  6   6.0   3.3 | -49.2 -56.6  210  19 10   6.5   3.6
 38000 -45.3 -49.5  190  10  5   6.0   3.3 | -45.3 -49.5  210  17  9   6.5   3.6
 36000 -41.6 -42.9  185   9  5   6.5   3.6 | -41.4 -42.5  215  15  8   7.3   4.0
 34000 -36.7 -34.1  200   6  3   7.4   4.0 | -36.0 -32.8  220  14  7   8.0   4.4
 32000 -32.3 -26.1  230   5  2   8.3   4.6 | -31.2 -24.2  230  13  7   8.4   4.6
 30000 -27.7 -17.9  235   4  2   7.7   4.2 | -26.7 -16.1  225  12  6   7.5   4.1
 29000 -25.4 -13.7  240   4  2   7.7   4.2 | -24.5 -12.1  225  11  5   7.5   4.1
 28000 -23.2  -9.8  235   5  3   6.8   3.7 | -22.3  -8.1  225  10  5   7.4   4.1
 27000 -21.2  -6.2  225   7  4   6.8   3.8 | -20.0  -4.0  225  11  6   7.5   4.1
 26000 -19.2  -2.6  220  10  5   6.9   3.8 | -17.8  -0.0  220  12  6   7.5   4.1
 25000 -17.1   1.2  220  12  6   6.9   3.8 | -15.6   3.9  220  12  6   6.8   3.7
 24000 -15.0   5.0  215  13  7   7.0   3.8 | -13.8   7.2  220  13  6   6.4   3.5
 23000 -12.9   8.8  210  13  7   7.0   3.8 | -11.9  10.6  215  13  7   6.4   3.5
 22000 -10.8  12.6  205  14  7   6.4   3.5 | -10.0  14.0  215  13  7   5.5   3.0
 21000  -8.9  16.0  195  12  6   6.1   3.4 |  -8.4  16.9  205  11  6   5.2   2.8
 20000  -7.0  19.4  185  10  5   6.2   3.4 |  -6.8  19.8  185  10  5   5.2   2.9
 19500  -6.1  21.0  180  10  5   6.4   3.5 |  -5.9  21.4  175   9  5   5.4   3.0
 19000  -5.0  23.0  180   9  5   7.9   4.3 |  -5.0  23.0  170   9  5   6.9   3.8
 18500  -3.8  25.2  175   9  5   7.8   4.3 |  -4.0  24.8  165   9  4   6.8   3.7
 18000  -2.7  27.1  175   8  4   8.0   4.4 |  -2.9  26.8  160   8  4   7.6   4.2
 17500  -1.5  29.3  180   8  4   8.2   4.5 |  -1.7  28.9  160   8  4   8.0   4.4
 17000  -0.3  31.5  180   9  4   8.2   4.5 |  -0.6  30.9  165   9  4   8.0   4.4
 16500   0.9  33.6  185   9  4   8.0   4.4 |   0.6  33.1  165   8  4   7.9   4.3
 16000   2.5  36.5  190   9  4   8.3   4.5 |   2.2  36.0  175   6  3   8.1   4.4
 15500   3.7  38.7  195   8  4   8.5   4.7 |   3.3  37.9  185   4  2   8.1   4.4
 15000   4.9  40.8  200   8  4   8.6   4.7 |   4.4  39.9  200   3  2   8.4   4.6
 14500   6.2  43.2  205   8  4   9.0   4.9 |   5.4  41.7  230   2  1   6.9   3.8
 14000   7.4  45.3  215   7  3   9.2   5.0 |   6.3  43.3  270   2  1   7.3   4.0
 13500   8.6  47.5  225   6  3   7.5   4.1 |   7.3  45.1  310   2  1   6.7   3.7
 13000   9.6  49.3  230   4  2   7.1   3.9 |   8.1  46.6  010   2  1   6.9   3.8
 12500  10.6  51.1  250   2  1   7.1   3.9 |   8.9  48.0  040   5  2   7.7   4.2
 12000  11.4  52.5  020   1  0   5.9   3.3 |  10.3  50.5  045   6  3   9.4   5.2
 11750  11.8  53.2  045   2  1   5.6   3.1 |  11.0  51.8  045   7  3   9.4   5.2
 11500  12.2  54.0  050   4  2   6.8   3.7 |  11.6  52.9  045   7  4  10.3   5.7
 11250  12.7  54.9  055   6  3   7.2   4.0 |  12.4  54.3  050   7  4  10.1   5.5
 11000  13.2  55.8  055   7  3   6.4   3.5 |  13.1  55.6  050   7  4   9.1   5.0
 10750  13.7  56.7  055   8  4   6.4   3.5 |  13.8  56.8  050   7  4   9.1   5.0
 10500  14.1  57.4  055   9  4   7.1   3.9 |  14.5  58.1  050   7  4  10.0   5.5
 10250  14.7  58.5  050  10  5   8.0   4.4 |  15.3  59.5  050   8  4  11.0   6.0
 10000  15.3  59.5  045  11  5   7.3   4.0 |  16.1  61.0  050   8  4  10.0   5.5
  9750  15.8  60.4  035  11  6   6.8   3.7 |  16.8  62.2  050   8  4   9.5   5.2
  9500  16.3  61.3  030  12  6   7.4   4.1 |  17.5  63.5  050   8  4   9.7   5.3
  9250  16.9  62.4  025  12  6   7.8   4.3 |  18.3  64.9  050   8  4   9.8   5.4
  9000  17.5  63.5  020  12  6   8.1   4.5 |  19.0  66.2  050   8  4   9.9   5.4
  8750  18.1  64.6  015  12  6   9.9   5.4 |  19.8  67.6  050   8  4  10.4   5.7
  8500  18.9  66.0  010  11  6  10.0   5.5 |  20.5  68.9  050   8  4  10.6   5.8
  8250  19.6  67.3  005  10  5   9.3   5.1 |  21.3  70.3  050   8  4  10.8   5.9
  8000  20.2  68.4  355  10  5   9.2   5.0 |  22.1  71.8  050   8  4  10.1   5.5
  7750  20.9  69.6  350   9  5  10.5   5.8 |  22.9  73.2  050   8  4  12.9   7.1
  7500  21.7  71.1  345   9  4  10.1   5.6 |  24.0  75.2  050   8  4  14.7   8.1
  7250  22.4  72.3  345   8  4   8.0   4.4 |  25.0  77.0  050   8  4  12.9   7.1
  7000  23.0  73.4  345   8  4   9.7   5.3 |  25.9  78.6  050   8  4  14.5   8.0
  6750     M     M    M   M  M     M     M |     M     M    M   M  M     M     M

           07/11/2014 at 1500 MDT          |       07/11/2014 at 1800 MDT
                                           |
K index... +27.2  LI... -2.9               | K index... +27.8  LI... -3.3
CAPE... +670.2  CIN... -0.4                | CAPE... +664.7  CIN... -7.1
                                           |
Height Temperature  Wnd WndSpd  Lapse Rate | Temperature  Wnd WndSpd  Lapse Rate
ft MSL deg C deg F  Dir kt m/s  C/km F/kft | deg C deg F  Dir kt m/s  C/km F/kft
--------------------------------------------------------------------------------
 50000 -66.3 -87.3  200  12  6   2.0   1.1 | -66.6 -87.9  215  13  6   1.9   1.0
 45000 -60.8 -77.4  215  12  6   6.4   3.5 | -61.0 -77.8  210  13  7   6.7   3.7
 40000 -50.2 -58.4  240  14  7   8.1   4.5 | -50.1 -58.2  245  10  5   7.7   4.2
 38000 -45.3 -49.5  245  15  7   8.1   4.5 | -45.5 -49.9  255  11  5   7.7   4.2
 36000 -40.5 -40.9  245  15  8   8.0   4.4 | -40.8 -41.4  265  12  6   8.3   4.6
 34000 -35.7 -32.3  235  14  7   8.0   4.4 | -35.8 -32.4  260  13  7   8.3   4.6
 32000 -30.9 -23.6  230  14  7   8.7   4.7 | -30.9 -23.6  260  14  7   9.1   5.0
 30000 -26.5 -15.7  220  15  8   7.4   4.0 | -26.2 -15.2  250  17  9   8.0   4.4
 29000 -24.3 -11.7  215  15  8   7.4   4.1 | -23.8 -10.8  245  19 10   8.0   4.4
 28000 -22.1  -7.8  210  16  8   7.0   3.8 | -21.6  -6.9  240  20 10   6.1   3.3
 27000 -19.6  -3.3  210  17  9   7.0   3.9 | -19.3  -2.7  230  22 11   6.2   3.4
 26000 -17.5   0.5  215  18  9   7.0   3.9 | -17.5   0.5  225  24 12   6.3   3.4
 25000 -15.4   4.3  215  18  9   6.8   3.7 | -15.6   3.9  225  25 13   6.4   3.5
 24000 -13.4   7.9  210  19 10   6.8   3.7 | -13.7   7.3  220  24 12   6.4   3.5
 23000 -11.4  11.5  210  19 10   6.8   3.7 | -11.9  10.6  220  23 12   6.5   3.5
 22000  -9.5  14.9  210  19 10   6.0   3.3 | -10.0  14.0  220  21 11   6.0   3.3
 21000  -7.7  18.1  205  17  9   5.9   3.3 |  -8.3  17.1  215  18  9   6.0   3.3
 20000  -6.0  21.2  200  15  8   5.9   3.3 |  -6.5  20.3  210  14  7   6.0   3.3
 19500  -5.1  22.8  195  15  7   5.9   3.2 |  -5.6  21.9  205  12  6   6.0   3.3
 19000  -4.2  24.4  190  14  7   5.8   3.2 |  -4.7  23.5  195  12  6   6.0   3.3
 18500  -3.4  25.9  185  13  7   5.8   3.2 |  -3.8  25.2  190  12  6   6.0   3.3
 18000  -2.5  27.5  180  12  6   6.4   3.5 |  -2.9  26.8  180  13  7   6.9   3.8
 17500  -1.6  29.1  180  11  6   6.5   3.6 |  -1.9  28.6  175  13  7   7.1   3.9
 17000  -0.7  30.7  175  11  6   6.6   3.6 |  -0.8  30.6  170  13  7   7.2   3.9
 16500   0.3  32.5  170   9  5   6.8   3.7 |   0.2  32.4  170  12  6   7.4   4.1
 16000   1.2  34.2  165   7  4   6.9   3.8 |   1.2  34.2  165  11  6   7.5   4.1
 15500   2.2  36.0  150   6  3   6.9   3.8 |   2.2  36.0  155  10  5   6.9   3.8
 15000   3.1  37.6  120   5  2   7.1   3.9 |   3.2  37.8  135   7  4   7.0   3.8
 14500   4.0  39.2  090   5  2   8.2   4.5 |   4.1  39.4  110   6  3   7.9   4.3
 14000   5.2  41.4  080   5  3   8.8   4.8 |   5.3  41.5  090   6  3   8.3   4.6
 13500   7.1  44.8  070   5  3   9.9   5.5 |   7.1  44.8  065   7  4   9.6   5.3
 13000   8.5  47.3  070   5  3  10.0   5.5 |   8.5  47.3  065   7  4   9.6   5.3
 12500  10.0  50.0  070   5  3  10.0   5.5 |   9.9  49.8  060   7  4   9.7   5.3
 12000  11.5  52.7  065   5  3   9.9   5.5 |  11.4  52.5  060   7  4   9.7   5.3
 11750  12.2  54.0  065   5  3   9.9   5.4 |  12.1  53.8  060   7  4   9.7   5.3
 11500  12.9  55.2  065   5  3  10.6   5.8 |  12.8  55.0  055   7  4  11.0   6.0
 11250  13.7  56.7  065   5  2  10.2   5.6 |  13.7  56.7  055   7  4  10.4   5.7
 11000  14.4  57.9  065   5  2   9.4   5.1 |  14.4  57.9  055   7  4   9.0   5.0
 10750  15.2  59.4  065   5  2   9.5   5.2 |  15.1  59.2  050   8  4   9.3   5.1
 10500  15.9  60.6  065   5  2  10.2   5.6 |  15.8  60.4  050   8  4   9.8   5.4
 10250  16.6  61.9  065   5  2  10.7   5.9 |  16.5  61.7  045   8  4  10.2   5.6
 10000  17.4  63.3  065   5  2   9.7   5.3 |  17.2  63.0  045   8  4   9.5   5.2
  9750  18.1  64.6  065   5  2   9.1   5.0 |  17.9  64.2  045   8  4   9.2   5.1
  9500  18.8  65.8  060   5  2   9.6   5.3 |  18.6  65.5  040   8  4   9.4   5.1
  9250  19.5  67.1  060   5  2  10.0   5.5 |  19.3  66.7  035   9  4   9.3   5.1
  9000  20.3  68.5  060   4  2   9.9   5.4 |  20.0  68.0  035   9  5   9.5   5.2
  8750  21.0  69.8  060   4  2   9.8   5.4 |  20.7  69.3  030   9  5  10.1   5.5
  8500  21.7  71.1  060   4  2  10.2   5.6 |  21.4  70.5  025  10  5   9.4   5.1
  8250  22.5  72.5  060   4  2  10.5   5.8 |  22.0  71.6  020  10  5   8.5   4.6
  8000  23.3  73.9  055   4  2  10.5   5.7 |  22.6  72.7  020  10  5   9.4   5.1
  7750  24.0  75.2  055   4  2  10.4   5.7 |  23.2  73.8  015  11  6   6.8   3.7
  7500  24.8  76.6  055   4  2  10.1   5.6 |  23.5  74.3  010  11  6   3.8   2.1
  7250  25.5  77.9  050   4  2   9.9   5.5 |  23.7  74.7  010  10  5   4.5   2.4
  7000  26.2  79.2  050   4  2  10.1   5.5 |  24.0  75.2  005   8  4   3.8   2.1
  6750     M     M    M   M  M     M     M |     M     M    M   M  M     M     M
________________________________________________________________________________

This product is issued twice per day, once by approximately 0630 MST/0730 MDT
(1330 UTC) and again by approximately 1830 MST/1930 MDT (0130 UTC).  It is not
continuously monitored nor updated after its initial issuance.

The information contained herein is based on rawinsonde observation and/or
numerical weather prediction model data taken near the Air Force Academy
in Colorado Springs, Colorado at

                   North Latitude:  38 deg 58 min 48.000 sec
                   West Longitude: 104 deg 49 min 12.000 sec
                   Elevation: 6572 feet (2003 meters)

and may not be representative of other areas along the Front Range of the
Colorado Rocky Mountains.  Note that some elevations in numerical weather
prediction models differ from actual station elevations, which can lead to
data which appear to be below ground.  Erroneous data such as these should
not be used.

The content and format of this report as well as the issuance times are subject
to change without prior notice.  Comments and suggestions are welcome and should
be directed to one of the addresses or phone numbers shown at the bottom of this
page.  To expedite a response to comments, be sure to mention your interest in
the soaring forecast.

DEFINITIONS:

CAPE (Convective Available Potential Energy) - An integrated measure of the
     energy available for convective development, also known as the positive
     area on a thermodynamic diagram.  Units are Joules per kilogram.  Larger
     values are indicative of greater instability and the possibility of
     stronger convective activity, including thunderstorms.  Values around or
     greater than 1000 suggest the possibility of severe weather should
     convective activity develop.

CIN (Convective Inhibition) - An integrated measure of the amount of energy
     needed to initiate convective activity, also known as the negative area on
     a thermodynamic diagram.  Units are Joules per kilogram.  The more negative
     this number, the more energy is required to initiate convection.  This
     inhibitive energy can be overcome through surface heating, cooling aloft,
     lifting mechanisms (orographic, frontal, gravity waves, etc.)

Convective Condensation Level - The height to which an air parcel possessing the
     average saturation mixing ratio in the lowest 4000 feet of the airmass,
     if heated sufficiently from below, will rise dry adiabatically until it
     just becomes saturated.  It estimates the base of cumulus clouds that are
     produced by surface heating only.

Convection Temperature (ConvectionT) - The surface temperature required to make
     the airmass dry adiabatic up to the given level.  It can be considered a
     "trigger temperature" for that level.

Freezing Level - The height where the temperature is zero degrees Celsius.

Height of Stable Layer - The height (between 12,000 and 18,000 feet above
     mean sea level) where the smallest lapse rate exists.  The location and
     existence of this feature is important in the generation of mountain
     waves.

K Index - A measure of stability which combines the temperature difference
     between approximately 5,000 and 18,000 feet above the surface, the amount
     of moisture at approximately 5,000 feet above the surface, and a measure
     of the dryness at approximately 10,000 feet above the surface.  Larger
     positive numbers indicate more instability and a greater likelihood of
     thunderstorm development.  One interpretation of K index values regarding
     soaring in the western United States is given in WMO Technical Note 158
     and is reproduced in the following table:

          below -10    no or weak thermals
           -10 to 5    dry thermals or 1/8 cumulus with moderate thermals
            5 to 15    good soaring conditions
           15 to 20    good soaring conditions with occasional showers
           20 to 30    excellent soaring conditions, but increasing
                       probability of showers and thunderstorms
           above 30    more than 60 percent probability of thunderstorms

Lapse Rate - The change with height of the temperature. Negative values indicate
     inversions.

Lifted Condensation Level - The height to which an air parcel possessing the
     average dew point in the lowest 4000 feet of the airmass and the forecast
     maximum temperature must be lifted dry adiabatically to attain saturation.

Lifted Index (LI) - The difference between the environmental temperature at a
     level approximately 18,000 feet above the surface and the temperature of
     an air parcel lifted dry adiabatically from the surface to its lifted
     condensation level and then pseudoadiabatically thereafter to this same
     level.  The parcel`s initial temperature is the forecast maximum
     temperature and its dew point is the average dew point in the lowest 4000
     feet of the airmass.  Negative values are indicative of instability with
     positive values showing stable conditions.

Lift Rate - An experimental estimate of the strength of thermals.  It is
     computed the same way as the maximum rate of lift but uses the actual
     level rather than the maximum height of thermals in the calculation.
     Also, none of the empirical adjustments based on cloudiness and K-index
     are applied to these calculations.

Maximum Height of Thermals - The height where the dry adiabat through the
     forecast maximum temperature intersects the environmental temperature.

Maximum Rate of Lift - An estimate of the maximum strength of thermals.  It
     is computed from an empirical formula which combines the expected maximum
     height of thermals with the difference in the environmental temperatures
     between the maximum height of thermals and the temperature 4,000 feet
     above the ground.  After this computation, further empirical adjustments
     are made based on the value of the K-index and the amount and opacity of
     middle and high level cloudiness expected between the time of trigger
     temperature and the time of overdevelopment.

Middle/High Clouds - The amount and opacity of middle (altostratus, altocumulus)
     or high (cirrus, cirrostratus, cirrocumulus) clouds.  Broken means that
     between 60% and 90% of the sky is covered by the cloud, with overcast
     conditions occurring when more than 90% of the sky is covered by the cloud.
     Thin implies that the clouds are predominantly transparent, meaning that
     some sunlight is reaching the ground, in contrast to opaque which suggests
     that little sunlight is reaching the ground.

Potential Height of Wave - The minimum of the following two heights:
     1. Level above the height of stable layer (or 14,000 feet if none exists)
        where the wind direction changes by 30 degrees or more
     2. Level above the height of stable layer (or 14,000 feet if none exists)
        where the wind speed no longer increases with height

PVA/NVA - Positive vorticity advection (PVA)/negative vorticity advection (NVA)
     on the 500 millibar isobaric surface (approximately 18,000 feet above mean
     sea level).  Weak PVA has been shown to assist in mountain wave soaring.

Soaring Window - The time between the time the trigger temperature is reached
                 and the time of overdevelopment.

Thermal Index - The difference between the environmental temperature and the
     temperature at a particular level determined by following the dry adiabat
     through the forecast maximum temperature up to that level.  Negative values
     are indicative of thermal lift.

Thermal Soaring Index - An adjective rating (for sailplanes) based on the
     computed maximum rate of lift, and the wind speed and middle and high
     cloud cover expected during the soaring window (the time of the trigger
     temperature and the time of overdevelopment) according to the following:

                 Maximum rate of lift        Adjective Rating
                      >= 800 fpm                 Excellent
                 >= 400 and < 800 fpm              Good
                 >= 200 and < 400 fpm              Fair
                       < 200 fpm                   Poor

Time of Overdevelopment - The time one or more of the following phenomena,
     which essentially shut off thermal lift, is expected to occur:
     1. formation of broken to overcast convective cloud cover
     2. formation of scattered to numerous downbursts
     3. initiation of widespread precipitation

Time of Trigger Temperature - The time the surface temperature is expected to
     reach the trigger temperature.

Trigger Temperature - The surface temperature required to make the first 4000
     feet of the atmosphere dry adiabatic.

Wave Soaring Index - An empirical, adjective rating (for sailplanes) which
     attempts to combine a variety of phenomena important in mountain wave
     soaring into a single index number.  Objective points are assigned to
     these phenomena: wind speed and direction at 14,000 ft MSL, the static
     stability in the 12,000-18,000 ft MSL layer, the wind speed gradient above
     the stable layer, jet stream location and frontal and upper trough
     movements.

042613



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