Soaring Guidance
Issued by NWS Pueblo, CO

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918
UXUS97 KPUB 081202
SRGPUB

Soaring Forecast
National Weather Service Pueblo, Colorado
0602 MDT Monday, July 8, 2024

This forecast is for Villa Grove, CO for Monday, July 8, 2024:

If the trigger temperature of 55.5 F/13.1 C is reached...then
   Thermal Soaring Index....................... Excellent
   Maximum rate of lift........................ 1512 ft/min (7.7 m/s)
   Maximum height of thermals.................. 22729 ft MSL (13738 ft AGL)

Forecast maximum temperature................... 71.0 F/22.1 C
Time of trigger temperature.................... 0900 MDT
Time of overdevelopment........................ 1200 MDT
Middle/high clouds during soaring window....... None
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 18750 ft MSL (9759 ft AGL)
Thermal soaring outlook for Tuesday 07/09...... Excellent

Wave Soaring Index............................. Not available

Remarks...

Sunrise/Sunset.................... 05:48:15 / 20:29:22 MDT
Total possible sunshine........... 14 hr 41 min 6 sec (881 min 6 sec)
Altitude of sun at 13:08:49 MDT... 73.97 degrees

Upper air data from numerical model forecast valid on 07/08/2024 at 0600 MDT

Freezing level.................. 13466 ft MSL (4475 ft AGL)
Convective condensation level... 12369 ft MSL (3378 ft AGL)
Lifted condensation level....... 16081 ft MSL (7090 ft AGL)
Lifted index.................... -8.1
K index......................... +25.7

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  -56.3 -69.3   320   26   13   2.8   1.5      M     M       M      M    M
 45000  -53.0 -63.4   330   39   20   0.4   0.2      M     M       M      M    M
 40000  -52.2 -62.0   330   48   25   4.5   2.5      M     M       M      M    M
 38000  -49.5 -57.1   330   50   26   4.4   2.4      M     M       M      M    M
 36000  -46.9 -52.4   325   52   27   4.4   2.4      M     M       M      M    M
 34000  -43.7 -46.7   320   50   26   5.8   3.2      M     M       M      M    M
 32000  -40.2 -40.4   320   46   23   5.8   3.2      M     M       M      M    M
 30000  -36.0 -32.8   315   42   21   7.6   4.2   28.6  83.4     5.5      M    M
 29000  -33.1 -27.6   315   39   20   7.6   4.2   27.6  81.7     4.8      M    M
 28000  -30.9 -23.6   310   37   19   7.6   4.2   27.0  80.5     4.3      M    M
 27000  -28.7 -19.7   310   36   18   7.3   4.0   26.0  78.8     3.5      M    M
 26000  -26.5 -15.7   310   34   18   7.4   4.0   25.1  77.1     2.8      M    M
 25000  -24.3 -11.7   305   33   17   7.5   4.1   24.3  75.7     2.2      M    M
 24000  -22.3  -8.1   305   32   16   6.5   3.6   23.2  73.8     1.3      M    M
 23000  -20.4  -4.7   305   30   15   6.5   3.6   22.0  71.7     0.3      M    M
 22000  -18.4  -1.1   305   29   15   6.4   3.5   21.0  69.8    -0.7   1248  6.3
 21000  -16.3   2.7   300   26   13   7.6   4.1   20.1  68.2    -1.5   1155  5.9
 20000  -14.1   6.6   300   22   12   7.7   4.2   19.4  66.8    -2.3   1061  5.4
 19500  -13.0   8.6   300   21   11   7.7   4.2   19.0  66.3    -2.7   1013  5.1
 19000  -11.9  10.6   300   20   10   9.2   5.0   18.8  65.9    -3.0    964  4.9
 18500  -10.5  13.1   300   19   10   9.5   5.2   18.8  65.8    -3.0    906  4.6
 18000   -9.0  15.8   305   19   10   9.5   5.2   18.8  65.8    -3.1    849  4.3
 17500   -7.6  18.3   305   19   10   9.5   5.2   18.7  65.7    -3.1    792  4.0
 17000   -6.2  20.8   305   18    9   9.6   5.3   18.7  65.6    -3.2    736  3.7
 16500   -4.9  23.2   310   17    9   8.1   4.5   18.6  65.4    -3.4    682  3.5
 16000   -3.8  25.2   310   13    7   8.0   4.4   18.3  64.9    -3.8    633  3.2
 15500   -2.2  28.0   310    9    4   6.1   3.3   17.7  63.9    -4.4    564  2.9
 15000   -1.3  29.7   295    6    3   6.1   3.3   17.1  62.9    -5.0    522  2.7
 14500   -0.5  31.1   260    4    2   4.1   2.3   16.6  61.8    -5.6    481  2.4
 14000   -0.2  31.6   230    4    2   2.6   1.4   15.4  59.7    -6.8    459  2.3
 13500    0.0  32.0   200    4    2   6.9   3.8   14.2  57.6    -8.1    437  2.2
 13000    1.3  34.3   185    6    3   6.8   3.7   14.1  57.4    -8.3    383  1.9
 12500    2.3  36.1   180    7    4   7.8   4.3   13.7  56.7    -8.8    339  1.7
 12000    3.6  38.5   170    8    4   8.5   4.7   13.6  56.5    -9.0    285  1.4
 11750    4.1  39.4   165    9    5   6.7   3.7   13.4  56.2    -9.2    262  1.3
 11500    4.6  40.3   160   10    5   6.4   3.5   13.2  55.8    -9.5    241  1.2
 11250    5.0  41.0   155   11    6   6.0   3.3   12.9  55.3    -9.8    220  1.1
 11000    5.5  41.9   150   11    6   5.9   3.2   12.6  54.7   -10.2    200  1.0
 10750    5.9  42.6   150   11    6   6.0   3.3   12.4  54.2   -10.5    180  0.9
 10500    6.3  43.3   145   11    6   4.4   2.4   12.0  53.7   -10.8    161  0.8
 10250    6.5  43.7   145   10    5   2.2   1.2   11.5  52.7   -11.4    147  0.7
 10000    6.6  43.9   140    8    4   2.3   1.3   10.9  51.7   -12.0    135  0.7
  9750    6.8  44.2   135    6    3   1.0   0.5   10.4  50.6   -12.6    123  0.6
  9500    6.9  44.4   125    4    2   4.2   2.3    9.7  49.5   -13.3    113  0.6
  9250    7.6  45.7   105    2    1  14.2   7.8    9.7  49.5   -13.4     85  0.4
  9000    8.4  47.1   060    2    1  -0.6  -0.3    9.8  49.6   -13.3     54  0.3
  8750      M     M     M    M    M     M     M      M     M       M      M    M
  8500      M     M     M    M    M     M     M      M     M       M      M    M
  8250      M     M     M    M    M     M     M      M     M       M      M    M
  8000      M     M     M    M    M     M     M      M     M       M      M    M

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

           07/08/2024 at 0900 MDT          |       07/08/2024 at 1200 MDT
                                           |
CAPE...  +766.5    LI...       -4.3        | CAPE...  +863.8    LI...       -3.2
CINH...    -3.2    K Index... +19.0        | CINH...     0.0    K Index...  -2.3
                                           |
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 -56.6 -69.9  330  25 13   2.6   1.4 | -57.2 -71.0  335  22 11   1.4   0.7
 45000 -53.3 -63.9  340  36 18   0.9   0.5 | -55.1 -67.2  340  29 15   1.5   0.8
 40000 -51.6 -60.9  340  52 27   4.9   2.7 | -52.4 -62.3  340  42 21   5.1   2.8
 38000 -48.9 -56.0  340  57 29   4.5   2.5 | -49.5 -57.1  340  45 23   4.8   2.7
 36000 -46.2 -51.2  340  63 32   4.5   2.5 | -46.6 -51.9  345  49 25   4.9   2.7
 34000 -42.6 -44.7  340  61 32   6.6   3.6 | -42.5 -44.5  345  50 26   7.5   4.1
 32000 -38.7 -37.7  340  57 29   6.6   3.6 | -38.1 -36.6  350  50 26   7.5   4.1
 30000 -35.0 -31.0  340  49 25   5.9   3.2 | -33.9 -29.0  350  43 22   6.6   3.6
 29000 -32.7 -26.9  340  42 22   5.9   3.3 | -31.4 -24.5  350  37 19   6.6   3.6
 28000 -31.0 -23.8  340  37 19   6.3   3.5 | -29.5 -21.1  355  32 16   6.9   3.8
 27000 -28.8 -19.8  340  35 18   7.5   4.1 | -27.3 -17.1  355  29 15   7.1   3.9
 26000 -26.5 -15.7  340  33 17   7.5   4.1 | -25.2 -13.4  355  26 13   7.1   3.9
 25000 -24.3 -11.7  340  31 16   7.5   4.1 | -23.1  -9.6  360  23 12   7.1   3.9
 24000 -22.0  -7.6  340  29 15   7.8   4.3 | -20.7  -5.3  360  21 11   8.1   4.4
 23000 -19.7  -3.5  340  27 14   7.8   4.3 | -18.3  -0.9  360  20 10   8.1   4.4
 22000 -17.3   0.9  340  25 13   7.8   4.3 | -15.9   3.4  360  19 10   7.9   4.3
 21000 -15.5   4.1  335  23 12   5.9   3.3 | -13.7   7.3  360  18  9   6.9   3.8
 20000 -13.7   7.3  325  22 11   6.2   3.4 | -11.7  10.9  355  18  9   6.9   3.8
 19500 -12.8   9.0  320  22 11   6.4   3.5 | -10.7  12.7  355  17  9   6.9   3.8
 19000 -11.9  10.6  315  22 11   8.2   4.5 |  -9.7  14.5  350  17  9   6.5   3.6
 18500 -10.6  12.9  310  21 11   8.5   4.7 |  -8.7  16.3  350  16  8   6.5   3.6
 18000  -9.4  15.1  310  21 11   8.7   4.8 |  -7.7  18.1  345  16  8   6.3   3.4
 17500  -8.0  17.6  310  20 10   9.4   5.2 |  -6.9  19.6  340  16  8   5.9   3.3
 17000  -6.7  19.9  310  19 10   9.4   5.1 |  -6.0  21.2  330  16  8   6.4   3.5
 16500  -5.3  22.5  310  17  9   9.4   5.2 |  -5.1  22.8  325  15  8   8.0   4.4
 16000  -3.9  25.0  315  14  7   9.4   5.1 |  -4.0  24.8  320  14  7   8.1   4.4
 15500  -2.5  27.5  325  11  6   8.9   4.9 |  -2.9  26.8  320  12  6   8.0   4.4
 15000  -1.3  29.7  330  10  5   8.4   4.6 |  -1.8  28.8  325  11  6   8.0   4.4
 14500   0.4  32.7  335   8  4   5.9   3.2 |  -0.7  30.7  330  10  5   8.7   4.8
 14000   1.1  34.0  330   6  3   5.2   2.8 |   1.0  33.8  325   6  3   7.9   4.3
 13500   1.7  35.1  310   4  2   4.3   2.4 |   2.0  35.6  320   3  1   8.7   4.8
 13000   2.2  36.0  265   3  2   3.9   2.2 |   3.3  37.9  250   1  0   9.0   4.9
 12500   2.7  36.9  230   4  2   5.3   2.9 |   4.5  40.1  160   2  1   9.8   5.4
 12000   3.7  38.7  220   5  2   6.8   3.7 |   6.1  43.0  145   3  1  10.1   5.5
 11750   4.1  39.4  215   5  2   5.5   3.0 |   6.8  44.2  145   3  1   9.4   5.1
 11500   4.4  39.9  215   5  3   6.6   3.6 |   7.6  45.7  140   3  1   9.7   5.3
 11250   5.0  41.0  210   5  3   8.3   4.5 |   8.3  46.9  140   3  1   9.9   5.4
 11000   5.5  41.9  200   5  3   7.5   4.1 |   9.0  48.2  135   3  2   9.8   5.4
 10750   6.1  43.0  195   5  3  10.3   5.7 |   9.7  49.5  135   3  2  10.1   5.6
 10500   7.0  44.6  185   5  3  11.8   6.5 |  10.5  50.9  130   3  2  10.7   5.9
 10250   7.7  45.9  180   5  2   9.7   5.3 |  11.3  52.3  130   3  2  10.6   5.8
 10000   8.4  47.1  180   4  2  10.2   5.6 |  12.1  53.8  125   3  2  11.4   6.2
  9750   9.2  48.6  175   4  2   9.0   4.9 |  12.9  55.2  125   3  2   8.7   4.8
  9500   9.9  49.8  165   3  1  13.7   7.5 |  13.7  56.7  120   3  2  16.2   8.9
  9250  11.3  52.3  165   3  1  24.9  13.7 |  15.6  60.1  120   3  2  36.6  20.1
  9000  12.8  55.0  160   3  1   5.5   3.0 |  17.6  63.7  120   4  2   0.2   0.1
  8750     M     M    M   M  M     M     M |     M     M    M   M  M     M     M
  8500     M     M    M   M  M     M     M |     M     M    M   M  M     M     M
  8250     M     M    M   M  M     M     M |     M     M    M   M  M     M     M
  8000     M     M    M   M  M     M     M |     M     M    M   M  M     M     M

           07/08/2024 at 1500 MDT          |       07/08/2024 at 1800 MDT
                                           |
CAPE...  +771.9    LI...       -3.0        | CAPE...  +919.2    LI...       -2.9
CINH...     0.0    K Index... +19.2        | CINH...    -5.4    K Index... +28.6
                                           |
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 -57.2 -71.0  335  19 10   1.8   1.0 | -57.7 -71.9  340  19 10   1.5   0.8
 45000 -54.9 -66.8  340  27 14   0.8   0.4 | -55.4 -67.7  340  26 13   1.2   0.7
 40000 -53.2 -63.8  340  36 18   5.3   2.9 | -53.2 -63.8  350  31 16   5.2   2.9
 38000 -50.2 -58.4  340  36 19   5.0   2.8 | -50.2 -58.4  345  28 15   5.1   2.8
 36000 -47.2 -53.0  340  37 19   5.1   2.8 | -47.1 -52.8  340  27 14   5.0   2.8
 34000 -42.8 -45.0  345  37 19   8.1   4.4 | -42.8 -45.0  340  24 12   7.9   4.3
 32000 -37.9 -36.2  350  38 19   8.1   4.4 | -38.0 -36.4  340  22 11   7.9   4.3
 30000 -32.8 -27.0  350  36 19   7.4   4.0 | -32.5 -26.5  350  22 11   8.2   4.5
 29000 -30.6 -23.1  350  35 18   7.4   4.0 | -30.1 -22.2  350  22 11   8.2   4.5
 28000 -28.4 -19.1  350  34 17   7.1   3.9 | -27.6 -17.7  355  23 12   7.6   4.2
 27000 -26.3 -15.3  350  31 16   6.9   3.8 | -25.4 -13.7  355  24 12   7.4   4.0
 26000 -24.3 -11.7  350  28 15   6.9   3.8 | -23.2  -9.8  360  24 12   7.4   4.0
 25000 -22.2  -8.0  350  25 13   6.9   3.8 | -21.0  -5.8  360  25 13   7.4   4.0
 24000 -20.0  -4.0  350  23 12   7.5   4.1 | -18.9  -2.0  360  23 12   7.3   4.0
 23000 -17.8  -0.0  345  21 11   7.5   4.1 | -16.7   1.9  355  21 11   7.3   4.0
 22000 -15.5   4.1  345  19 10   7.4   4.1 | -14.6   5.7  350  19 10   7.4   4.0
 21000 -13.4   7.9  345  18  9   7.2   4.0 | -12.5   9.5  340  18  9   7.4   4.0
 20000 -11.2  11.8  345  17  9   7.3   4.0 | -10.4  13.3  330  17  9   7.5   4.1
 19500 -10.2  13.6  345  16  8   7.4   4.1 |  -9.3  15.3  325  17  9   7.6   4.2
 19000  -9.1  15.6  340  16  8   7.0   3.9 |  -8.2  17.2  320  16  8   8.1   4.4
 18500  -8.1  17.4  340  16  8   7.2   3.9 |  -7.1  19.2  320  16  8   8.0   4.4
 18000  -7.1  19.2  335  16  8   7.4   4.1 |  -5.9  21.4  315  16  8   7.5   4.1
 17500  -6.1  21.0  335  15  8   7.5   4.1 |  -4.9  23.2  315  15  8   6.6   3.6
 17000  -5.0  23.0  330  14  7   7.6   4.2 |  -4.0  24.8  310  15  8   6.5   3.6
 16500  -4.0  24.8  325  12  6   7.2   4.0 |  -3.0  26.6  305  14  7   7.1   3.9
 16000  -3.0  26.6  315   9  5   7.3   4.0 |  -1.9  28.6  300  13  7   7.1   3.9
 15500  -2.0  28.4  295   6  3   8.0   4.4 |  -0.9  30.4  290  12  6   7.4   4.0
 15000  -0.8  30.6  275   4  2   8.3   4.6 |   0.2  32.4  280  10  5   7.5   4.1
 14500   0.3  32.5  225   2  1   8.3   4.5 |   1.8  35.2  265   7  4   8.3   4.6
 14000   2.4  36.3  155   3  1   9.8   5.4 |   3.1  37.6  255   5  3   9.3   5.1
 13500   3.8  38.8  130   4  2   9.2   5.0 |   4.5  40.1  230   4  2   8.3   4.5
 13000   5.2  41.4  120   4  2  10.3   5.7 |   5.7  42.3  215   2  1   9.0   4.9
 12500   6.8  44.2  115   5  2   9.7   5.3 |   7.0  44.6  150   2  1   8.9   4.9
 12000   8.1  46.6  110   5  3  10.1   5.5 |   8.3  46.9  095   3  2   9.5   5.2
 11750   8.9  48.0  105   6  3  11.5   6.3 |   9.0  48.2  090   4  2  10.4   5.7
 11500   9.8  49.6  105   6  3  10.3   5.7 |   9.8  49.6  085   5  2   9.4   5.1
 11250  10.5  50.9  105   6  3   9.5   5.2 |  10.4  50.7  085   5  3   8.4   4.6
 11000  11.2  52.2  105   6  3   9.3   5.1 |  11.0  51.8  080   6  3   8.3   4.6
 10750  11.9  53.4  100   6  3  10.7   5.9 |  11.7  53.1  080   6  3   9.5   5.2
 10500  12.8  55.0  100   6  3  11.4   6.2 |  12.4  54.3  080   6  3  10.0   5.5
 10250  13.6  56.5  100   6  3  10.2   5.6 |  13.1  55.6  080   6  3   9.0   5.0
 10000  14.3  57.7  100   7  3  10.8   5.9 |  13.8  56.8  080   6  3   9.1   5.0
  9750  15.1  59.2  095   7  3   9.1   5.0 |  14.4  57.9  075   6  3   9.1   5.0
  9500  15.9  60.6  095   7  3  14.3   7.9 |  15.1  59.2  075   6  3  11.6   6.4
  9250  17.5  63.5  095   7  3  28.7  15.7 |  16.1  61.0  075   6  3  15.6   8.6
  9000  19.2  66.6  095   7  3   6.6   3.6 |  17.1  62.8  075   6  3   9.5   5.2
  8750     M     M    M   M  M     M     M |     M     M    M   M  M     M     M
  8500     M     M    M   M  M     M     M |     M     M    M   M  M     M     M
  8250     M     M    M   M  M     M     M |     M     M    M   M  M     M     M
  8000     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).  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 Villa Grove, Colorado at:

                   North Latitude:  38 deg 16 min 03 sec
                   West Longitude: 105 deg 53 min 37 sec
                   Elevation: 7986 feet (2434 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.

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