Soaring Guidance
Issued by NWS Denver/Boulder, CO

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000
UXUS97 KBOU 221321
SRGBOU

Soaring Forecast
National Weather Service Denver/Boulder, Colorado
0621 MST Wednesday, November 22, 2017

This forecast is for Wednesday, November 22, 2017:

If the trigger temperature of 62.6 F/17.0 C is reached...then
   Thermal Soaring Index....................... Good
   Maximum rate of lift........................ 437 ft/min (2.2 m/s)
   Maximum height of thermals.................. 12193 ft MSL (6884 ft AGL)

Forecast maximum temperature................... 68.0 F/20.5 C
Time of trigger temperature.................... 1100 MST
Time of overdevelopment........................ None
Middle/high clouds during soaring window....... Overcast thin high
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 9112 ft MSL (3803 ft AGL)
Thermal soaring outlook for Thursday 11/23..... Good

Wave Soaring Index............................. Poor
Wave Soaring Index trend (to 1700 MST)......... No change
Height of stable layer (12-18K ft MSL)......... 16865 ft MSL (11556 ft AGL)
Weak PVA/NVA (through 1700 MST)................ Weak PVA
Potential height of wave....................... 21045 ft MSL (15736 ft AGL)
Wave soaring outlook for Thursday 11/23........ Poor

Remarks...

Sunrise/Sunset.................... 06:52:33 / 16:38:54 MST
Total possible sunshine........... 9 hr 46 min 21 sec (586 min 21 sec)
Altitude of sun at 11:45:44 MST... 29.85 degrees

Upper air data from numerical model forecast valid on 11/22/2017 at 0500 MST

Freezing level.................. 11872 ft MSL (6563 ft AGL)
Convective condensation level... 15224 ft MSL (9915 ft AGL)
Lifted condensation level....... 14031 ft MSL (8722 ft AGL)
Lifted index.................... +7.3
K index......................... +16.5

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  -69.9 -93.8   325   32   17  -0.6  -0.3      M     M       M      M    M
 45000  -68.6 -91.5   330   48   25   7.2   4.0      M     M       M      M    M
 40000  -57.8 -72.0   325   50   26   7.6   4.2      M     M       M      M    M
 38000  -53.1 -63.6   330   47   24   7.8   4.3      M     M       M      M    M
 36000  -48.5 -55.3   330   44   23   7.8   4.3      M     M       M      M    M
 34000  -43.7 -46.7   330   42   22   8.0   4.4      M     M       M      M    M
 32000  -38.9 -38.0   330   40   21   8.0   4.4      M     M       M      M    M
 30000  -33.6 -28.5   330   38   19   7.7   4.3   42.9 109.1    17.3      M    M
 29000  -31.3 -24.3   335   37   19   7.8   4.3   42.1 107.8    16.9      M    M
 28000  -29.0 -20.2   335   36   18   7.8   4.3   41.5 106.6    16.6      M    M
 27000  -26.8 -16.2   335   35   18   7.5   4.1   40.5 104.9    16.0      M    M
 26000  -24.5 -12.1   335   34   17   7.5   4.1   39.6 103.3    15.5      M    M
 25000  -22.3  -8.1   340   33   17   7.5   4.1   38.9 101.9    15.0      M    M
 24000  -20.1  -4.2   340   31   16   7.6   4.2   38.0 100.5    14.5      M    M
 23000  -17.8  -0.0   340   29   15   7.6   4.2   37.2  99.0    14.0      M    M
 22000  -15.5   4.1   340   28   14   7.7   4.2   36.5  97.7    13.6      M    M
 21000  -13.5   7.7   340   24   13   6.3   3.5   35.4  95.7    12.8      M    M
 20000  -11.7  10.9   335   21   11   6.3   3.5   34.2  93.5    11.8      M    M
 19500  -10.8  12.6   330   19   10   6.2   3.4   33.6  92.5    11.4      M    M
 19000   -9.8  14.4   325   17    9   4.8   2.6   33.1  91.5    10.9      M    M
 18500   -9.5  14.9   320   16    8   2.3   1.3   31.8  89.2     9.9      M    M
 18000   -9.2  15.4   310   15    8   2.3   1.2   30.5  86.9     8.8      M    M
 17500   -8.9  16.0   305   14    7   2.3   1.3   29.2  84.6     7.7      M    M
 17000   -8.5  16.7   305   14    7   2.4   1.3   28.0  82.3     6.6      M    M
 16500   -8.2  17.2   310   14    7   3.1   1.7   26.7  80.1     5.5      M    M
 16000   -7.4  18.7   310   14    7   4.0   2.2   25.2  77.4     4.1      M    M
 15500   -6.8  19.8   310   14    7   4.8   2.7   24.3  75.8     3.3      M    M
 15000   -6.1  21.0   315   13    7   5.2   2.9   23.5  74.4     2.6      M    M
 14500   -5.3  22.5   320   13    7   6.0   3.3   22.8  73.0     1.9      M    M
 14000   -4.3  24.3   320   13    7   7.1   3.9   22.3  72.2     1.5      M    M
 13500   -3.2  26.2   325   13    7   7.0   3.8   21.9  71.4     1.1      M    M
 13000   -2.2  28.0   325   13    7   6.7   3.7   21.4  70.5     0.7      M    M
 12500   -1.2  29.8   330   13    6   6.8   3.7   20.9  69.7     0.2      M    M
 12000   -0.2  31.6   330   12    6   7.0   3.9   20.5  68.9    -0.2    514  2.6
 11500    0.9  33.6   330   12    6   6.9   3.8   20.0  68.1    -0.6    468  2.4
 11000    1.8  35.2   330   11    6   5.8   3.2   19.5  67.1    -1.2    426  2.2
 10500    2.7  36.9   330   10    5   5.3   2.9   18.9  66.0    -1.7    384  2.0
 10250    3.0  37.4   330   10    5   2.9   1.6   18.4  65.2    -2.2    367  1.9
 10000    3.3  37.9   330   10    5   6.1   3.4   17.9  64.3    -2.6    352  1.8
  9750    3.9  39.0   325    9    4   9.7   5.3   17.9  64.2    -2.7    325  1.7
  9500    4.6  40.3   325    8    4   8.4   4.6   17.8  64.1    -2.8    298  1.5
  9250    5.2  41.4   325    8    4   7.6   4.1   17.7  63.8    -2.9    272  1.4
  9000    5.8  42.4   325    7    4   8.6   4.7   17.5  63.5    -3.1    248  1.3
  8750    6.5  43.7   320    7    4  11.9   6.5   17.6  63.6    -3.0    218  1.1
  8500    7.4  45.3   320    8    4   9.5   5.2   17.7  63.9    -2.9    184  0.9
  8250    7.9  46.2   320    9    5   6.5   3.6   17.5  63.5    -3.1    161  0.8
  8000    8.5  47.3   315   11    5   7.2   3.9   17.3  63.2    -3.3    138  0.7
  7750    8.9  48.0   315   12    6   4.2   2.3   17.0  62.6    -3.6    117  0.6
  7500    9.1  48.4   310   13    7   1.3   0.7   16.5  61.6    -4.2    105  0.5
  7250    9.1  48.4   305   13    7   1.3   0.7   15.8  60.4    -4.9     95  0.5
  7000    9.2  48.6   300   13    7   1.1   0.6   15.2  59.3    -5.5     85  0.4
  6750    9.3  48.7   295   13    7   0.3   0.2   14.5  58.0    -6.2     76  0.4
  6500    9.3  48.7   290   11    6   0.9   0.5   13.8  56.8    -7.0     69  0.3
  6250    9.5  49.1   290   10    5   5.0   2.7   13.2  55.8    -7.5     56  0.3
  6000    9.7  49.5   285    8    4  -5.0  -2.7   12.7  54.8    -8.1     42  0.2
  5750    8.3  46.9   275    6    3 -31.8 -17.4   10.6  51.0   -10.2     75  0.4
  5500    5.2  41.4   245    3    2 -47.3 -25.9    6.7  44.1   -14.0    161  0.8

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

           11/22/2017 at 0800 MST          |       11/22/2017 at 1100 MST
                                           |
CAPE...     0.0    LI...       +6.8        | CAPE...     0.0    LI...       +6.6
CINH...     0.0    K Index... +13.5        | CINH...     0.0    K Index... +13.6
                                           |
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 -70.5 -94.9  325  30 16  -0.2  -0.1 | -70.0 -94.0  330  29 15   0.7   0.4
 45000 -68.7 -91.7  330  41 21   6.9   3.8 | -67.1 -88.8  330  38 19   6.3   3.5
 40000 -58.2 -72.8  325  43 22   8.1   4.4 | -57.5 -71.5  320  41 21   7.8   4.3
 38000 -53.3 -63.9  330  41 21   8.2   4.5 | -52.8 -63.0  320  38 19   8.0   4.4
 36000 -48.4 -55.1  330  39 20   8.2   4.5 | -48.0 -54.4  320  34 18   8.0   4.4
 34000 -43.4 -46.1  330  38 20   8.5   4.7 | -43.1 -45.6  325  32 17   8.2   4.5
 32000 -38.3 -36.9  330  37 19   8.5   4.7 | -37.5 -35.5  325  31 16   8.2   4.5
 30000 -33.1 -27.6  330  34 18   7.2   4.0 | -33.0 -27.4  325  29 15   7.2   4.0
 29000 -31.0 -23.8  330  33 17   7.2   4.0 | -30.9 -23.6  325  28 14   7.2   4.0
 28000 -28.8 -19.8  330  32 16   7.2   4.0 | -28.7 -19.7  325  27 14   7.2   3.9
 27000 -26.7 -16.1  330  31 16   7.3   4.0 | -26.7 -16.1  325  26 14   6.9   3.8
 26000 -24.5 -12.1  335  29 15   7.3   4.0 | -24.6 -12.3  325  26 13   7.0   3.8
 25000 -22.3  -8.1  335  28 15   7.3   4.0 | -22.5  -8.5  325  26 13   7.0   3.8
 24000 -20.1  -4.2  335  27 14   7.6   4.2 | -20.4  -4.7  325  24 12   7.5   4.1
 23000 -17.8  -0.0  340  25 13   7.6   4.2 | -18.1  -0.6  325  22 12   7.5   4.1
 22000 -15.5   4.1  340  23 12   7.7   4.2 | -15.9   3.4  320  20 11   7.6   4.2
 21000 -13.5   7.7  340  21 11   6.4   3.5 | -13.8   7.2  320  19 10   6.9   3.8
 20000 -11.7  10.9  340  20 10   6.4   3.5 | -11.8  10.8  315  17  9   6.9   3.8
 19500 -10.7  12.7  340  19 10   6.5   3.6 | -10.7  12.7  315  16  8   6.9   3.8
 19000  -9.8  14.4  345  18  9   7.9   4.3 |  -9.7  14.5  315  15  8   7.1   3.9
 18500  -8.4  16.9  340  17  9   9.1   5.0 |  -8.6  16.5  315  14  7   7.3   4.0
 18000  -7.1  19.2  335  17  9   9.6   5.3 |  -7.6  18.3  315  12  6   7.5   4.1
 17500  -6.0  21.2  330  16  8   4.3   2.4 |  -6.8  19.8  315  11  6   4.1   2.2
 17000  -5.3  22.5  325  15  8   4.8   2.6 |  -6.1  21.0  320  11  6   4.4   2.4
 16500  -4.7  23.5  320  14  7   2.2   1.2 |  -5.5  22.1  320  10  5   3.2   1.8
 16000  -4.7  23.5  320  13  7   0.5   0.3 |  -5.1  22.8  320  10  5   2.7   1.5
 15500  -4.7  23.5  310  11  6   0.4   0.2 |  -4.8  23.4  320  10  5   2.3   1.3
 15000  -4.6  23.7  315  10  5   0.6   0.3 |  -4.5  23.9  330   9  5   1.4   0.7
 14500  -4.6  23.7  320   9  5   2.7   1.5 |  -4.3  24.3  335   9  5   4.1   2.3
 14000  -3.9  25.0  325   9  5   4.6   2.5 |  -3.4  25.9  335   9  5   5.9   3.2
 13500  -3.2  26.2  330   9  5   5.4   2.9 |  -2.5  27.5  340  10  5   6.4   3.5
 13000  -2.3  27.9  335   9  5   6.6   3.6 |  -1.5  29.3  340  11  6   7.0   3.8
 12500  -1.3  29.7  340   9  5   6.9   3.8 |  -0.4  31.3  345  12  6   6.9   3.8
 12000  -0.2  31.6  340  10  5   7.7   4.2 |   0.6  33.1  345  12  6   6.9   3.8
 11500   0.9  33.6  345  10  5   7.5   4.1 |   1.6  34.9  345  12  6   7.0   3.9
 11000   2.0  35.6  340  10  5   6.8   3.8 |   2.7  36.9  340  12  6   7.4   4.1
 10500   3.0  37.4  340   9  5   5.9   3.2 |   3.8  38.8  340  11  6   5.6   3.1
 10250   3.3  37.9  340   9  5   3.0   1.6 |   4.0  39.2  340  11  6   2.0   1.1
 10000   3.6  38.5  340   9  5   7.7   4.2 |   4.3  39.7  340  11  6   7.8   4.3
  9750   4.5  40.1  340   9  5  12.5   6.9 |   5.2  41.4  335  10  5  13.5   7.4
  9500   5.3  41.5  335  10  5   9.4   5.1 |   6.0  42.8  330  10  5   8.9   4.9
  9250   5.9  42.6  335  10  5   6.6   3.6 |   6.5  43.7  330  10  5   4.8   2.7
  9000   6.4  43.5  330  11  6   7.9   4.4 |   6.9  44.4  325  11  5   7.5   4.1
  8750   7.1  44.8  325  12  6  11.2   6.2 |   7.6  45.7  320  12  6  10.8   5.9
  8500   7.9  46.2  320  13  7   7.9   4.4 |   8.3  46.9  320  12  6   5.8   3.2
  8250   8.2  46.8  315  14  7   4.5   2.5 |   8.5  47.3  315  13  7   1.8   1.0
  8000   8.6  47.5  315  14  7   5.6   3.1 |   8.6  47.5  310  13  7   2.6   1.4
  7750   9.0  48.2  310  15  8   4.7   2.6 |   8.8  47.8  305  13  7   2.9   1.6
  7500   9.3  48.7  305  15  8   3.2   1.7 |   9.0  48.2  305  12  6   4.6   2.5
  7250   9.5  49.1  305  14  7   2.5   1.3 |   9.4  48.9  305  11  5   5.3   2.9
  7000   9.7  49.5  305  13  7   3.0   1.6 |   9.8  49.6  305   9  5   4.3   2.3
  6750   9.9  49.8  300  12  6   3.4   1.8 |  10.1  50.2  300   8  4   4.7   2.6
  6500  10.1  50.2  295  11  5   2.1   1.1 |  10.5  50.9  300   6  3   6.0   3.3
  6250  10.3  50.5  295   9  5   4.5   2.5 |  11.0  51.8  295   5  2   5.3   2.9
  6000  10.5  50.9  290   7  4  -5.2  -2.9 |  11.4  52.5  290   3  2   6.7   3.7
  5750   9.2  48.6  275   5  3 -29.8 -16.3 |  12.1  53.8  280   2  1  11.1   6.1
  5500   6.4  43.5  245   3  2 -40.9 -22.4 |  13.0  55.4  270   2  1  14.2   7.8

           11/22/2017 at 1400 MST          |       11/22/2017 at 1700 MST
                                           |
CAPE...     0.0    LI...       +6.3        | CAPE...     0.0    LI...       +5.6
CINH...     0.0    K Index... +15.5        | CINH...     0.0    K Index... +16.3
                                           |
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 -69.0 -92.2  330  27 14   1.3   0.7 | -69.7 -93.5  325  27 14   1.6   0.9
 45000 -65.8 -86.4  330  34 17   5.5   3.0 | -66.1 -87.0  325  34 17   5.7   3.2
 40000 -57.5 -71.5  325  39 20   7.6   4.2 | -57.3 -71.1  325  37 19   7.7   4.2
 38000 -52.6 -62.7  320  36 19   8.2   4.5 | -52.5 -62.5  320  35 18   8.1   4.5
 36000 -47.6 -53.7  320  33 17   8.2   4.5 | -47.6 -53.7  315  33 17   8.1   4.5
 34000 -42.3 -44.1  320  31 16   7.7   4.2 | -42.9 -45.2  315  31 16   7.6   4.2
 32000 -37.7 -35.9  320  29 15   7.7   4.2 | -37.7 -35.9  320  29 15   7.6   4.2
 30000 -33.1 -27.6  320  27 14   7.7   4.2 | -33.2 -27.8  320  27 14   7.5   4.1
 29000 -30.8 -23.4  320  26 13   7.7   4.2 | -30.9 -23.6  320  26 13   7.5   4.1
 28000 -28.4 -19.1  315  25 13   7.7   4.2 | -28.7 -19.7  320  25 13   7.5   4.1
 27000 -26.4 -15.5  320  25 13   6.6   3.6 | -26.7 -16.1  325  26 13   6.5   3.6
 26000 -24.4 -11.9  320  26 13   6.6   3.6 | -24.7 -12.5  325  27 14   6.5   3.6
 25000 -22.4  -8.3  320  26 13   6.6   3.6 | -22.8  -9.0  325  27 14   6.5   3.6
 24000 -20.3  -4.5  320  26 13   7.4   4.1 | -20.6  -5.1  325  28 14   7.5   4.1
 23000 -18.1  -0.6  320  25 13   7.4   4.1 | -18.4  -1.1  330  28 14   7.5   4.1
 22000 -15.9   3.4  320  24 12   7.5   4.1 | -16.2   2.8  330  28 15   7.6   4.2
 21000 -13.8   7.2  320  21 11   6.9   3.8 | -14.1   6.6  330  27 14   6.7   3.7
 20000 -11.8  10.8  310  17  9   7.0   3.8 | -12.1  10.2  325  24 12   6.7   3.7
 19500 -10.8  12.6  305  16  8   7.0   3.9 | -11.2  11.8  320  23 12   6.7   3.7
 19000  -9.8  14.4  300  14  7   7.3   4.0 | -10.2  13.6  320  22 11   6.7   3.7
 18500  -8.7  16.3  295  13  7   7.5   4.1 |  -9.2  15.4  315  20 11   6.6   3.6
 18000  -7.6  18.3  290  12  6   8.2   4.5 |  -8.3  17.1  315  19 10   6.8   3.7
 17500  -6.9  19.6  295  11  6   0.7   0.4 |  -7.4  18.7  310  17  9   5.4   2.9
 17000  -6.7  19.9  305  11  6   1.4   0.8 |  -6.2  20.8  315  16  8   5.6   3.1
 16500  -6.3  20.7  310  12  6   2.8   1.5 |  -5.7  21.7  315  14  7   2.1   1.1
 16000  -6.0  21.2  310  10  5   2.6   1.4 |  -5.4  22.3  315  12  6   2.4   1.3
 15500  -5.5  22.1  310  10  5   3.9   2.2 |  -5.0  23.0  315  10  5   2.9   1.6
 15000  -4.9  23.2  315   9  5   4.2   2.3 |  -4.6  23.7  315   9  5   3.0   1.6
 14500  -4.3  24.3  315   9  4   4.8   2.7 |  -4.2  24.4  320   8  4   3.9   2.1
 14000  -3.5  25.7  315   8  4   5.4   3.0 |  -3.5  25.7  315   7  4   4.7   2.6
 13500  -2.7  27.1  320   8  4   5.9   3.2 |  -2.8  27.0  315   6  3   5.3   2.9
 13000  -1.7  28.9  320   8  4   6.9   3.8 |  -1.9  28.6  320   6  3   6.4   3.5
 12500  -0.7  30.7  325   8  4   7.1   3.9 |  -1.0  30.2  330   6  3   6.3   3.5
 12000   0.4  32.7  330   9  4   7.9   4.3 |  -0.1  31.8  335   7  4   6.4   3.5
 11500   1.6  34.9  335   9  5   8.0   4.4 |   0.8  33.4  345   8  4   6.6   3.6
 11000   2.8  37.0  335   9  5   8.4   4.6 |   1.9  35.4  345   8  4   7.5   4.1
 10500   4.0  39.2  330   8  4   6.6   3.6 |   3.0  37.4  345   7  4   5.9   3.2
 10250   4.3  39.7  330   8  4   2.5   1.4 |   3.3  37.9  340   7  4   2.1   1.1
 10000   4.6  40.3  330   8  4   6.4   3.5 |   3.5  38.3  340   7  4   6.4   3.5
  9750   5.3  41.5  325   8  4  10.7   5.9 |   4.2  39.6  340   7  3  10.6   5.8
  9500   6.0  42.8  320   9  4   7.1   3.9 |   4.9  40.8  335   6  3   8.3   4.5
  9250   6.3  43.3  315   9  5   3.7   2.1 |   5.5  41.9  335   7  3   6.3   3.5
  9000   6.6  43.9  315  10  5   4.5   2.4 |   6.0  42.8  330   7  4   8.1   4.4
  8750   7.0  44.6  310  11  6   5.4   2.9 |   6.7  44.1  325   8  4  11.2   6.1
  8500   7.3  45.1  305  11  6   5.1   2.8 |   7.5  45.5  320  10  5   7.9   4.4
  8250   7.7  45.9  305  10  5   4.7   2.6 |   7.9  46.2  315  10  5   5.0   2.8
  8000   8.0  46.4  300   8  4   5.3   2.9 |   8.3  46.9  310  10  5   5.7   3.1
  7750   8.5  47.3  300   7  3   8.0   4.4 |   8.7  47.7  305  11  5   6.0   3.3
  7500   9.2  48.6  300   6  3   9.6   5.3 |   9.2  48.6  300  10  5   7.3   4.0
  7250   9.9  49.8  300   5  3   8.8   4.8 |   9.7  49.5  300   9  5   7.7   4.2
  7000  10.5  50.9  300   5  2  10.5   5.8 |  10.3  50.5  300   8  4   7.6   4.2
  6750  11.4  52.5  300   4  2  10.9   6.0 |  10.9  51.6  300   7  4   8.5   4.7
  6500  12.1  53.8  300   4  2   9.5   5.2 |  11.6  52.9  300   6  3   9.1   5.0
  6250  12.9  55.2  305   4  2   9.9   5.4 |  12.2  54.0  300   6  3   8.7   4.8
  6000  13.6  56.5  305   4  2   9.8   5.4 |  12.9  55.2  300   5  3   9.5   5.2
  5750  14.4  57.9  305   4  2  11.6   6.4 |  13.5  56.3  305   4  2   4.8   2.6
  5500  15.3  59.5  305   3  2  14.6   8.0 |  13.4  56.1  300   3  2  -5.0  -2.7
________________________________________________________________________________

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 old Stapleton
Airport site in Denver, Colorado at

                   North Latitude:  39 deg 46 min 5.016 sec
                   West Longitude: 104 deg 52 min 9.984 sec
                   Elevation: 5285 feet (1611 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.

CINH (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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