Soaring Guidance
Issued by NWS Pueblo, CO

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363
UXUS97 KPUB 071227
SRGPUB

Soaring Forecast
National Weather Service Pueblo, Colorado
0625 MDT Monday, July 7, 2025

This forecast is for Villa Grove, CO for Monday, July 7, 2025:

If the trigger temperature of 66.6 F/19.2 C is reached...then
   Thermal Soaring Index....................... Excellent
   Maximum rate of lift........................ 1702 ft/min (8.6 m/s)
   Maximum height of thermals.................. 27929 ft MSL (18938 ft AGL)

Forecast maximum temperature................... 85.0 F/29.9 C
Time of trigger temperature.................... 0845 MDT
Time of overdevelopment........................ 1800 MDT
Middle/high clouds during soaring window....... Broken/overcast thin middle
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 24851 ft MSL (15860 ft AGL)
Thermal soaring outlook for Tuesday 07/08...... Excellent

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

Remarks...

Sunrise/Sunset.................... 05:47:30 / 20:29:45 MDT
Total possible sunshine........... 14 hr 42 min 15 sec (882 min 15 sec)
Altitude of sun at 13:08:37 MDT... 74.11 degrees

Upper air data from numerical model forecast valid on 07/07/2025 at 0600 MDT

Freezing level.................. 16278 ft MSL (7287 ft AGL)
Convective condensation level... 15133 ft MSL (6142 ft AGL)
Lifted condensation level....... 18371 ft MSL (9380 ft AGL)
Lifted index.................... -12.1
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  -63.3 -81.9   255   27   14   2.4   1.3      M     M       M      M    M
 45000  -57.6 -71.7   255   46   24   6.0   3.3      M     M       M      M    M
 40000  -48.6 -55.5   270   68   35   5.9   3.2      M     M       M      M    M
 38000  -45.1 -49.2   270   65   33   5.9   3.2      M     M       M      M    M
 36000  -41.5 -42.7   270   62   32   6.0   3.3      M     M       M      M    M
 34000  -38.2 -36.8   265   56   29   5.6   3.1      M     M       M      M    M
 32000  -34.8 -30.6   265   49   25   5.6   3.0      M     M       M      M    M
 30000  -31.3 -24.3   265   41   21   5.1   2.8   32.6  90.7     2.6      M    M
 29000  -29.8 -21.6   265   37   19   5.1   2.8   31.0  87.7     1.2      M    M
 28000  -28.2 -18.8   270   33   17   6.4   3.5   29.5  85.0    -0.0   1902  9.7
 27000  -26.2 -15.2   270   28   15   6.6   3.6   28.2  82.7    -1.1   1813  9.2
 26000  -24.3 -11.7   270   24   12   6.7   3.7   27.1  80.7    -2.0   1725  8.8
 25000  -22.3  -8.1   270   20   10   6.9   3.8   26.1  78.9    -2.9   1636  8.3
 24000  -20.1  -4.2   270   20   10   7.7   4.2   25.2  77.4    -3.7   1539  7.8
 23000  -17.8  -0.0   265   20   10   7.8   4.3   24.5  76.1    -4.4   1442  7.3
 22000  -15.5   4.1   260   21   11   8.2   4.5   23.9  75.1    -5.0   1345  6.8
 21000  -13.0   8.6   260   19   10   8.6   4.7   23.5  74.2    -5.5   1238  6.3
 20000  -10.4  13.3   265   17    9   8.6   4.7   23.1  73.6    -5.9   1131  5.7
 19500   -9.1  15.6   270   16    8   8.6   4.7   23.0  73.3    -6.1   1078  5.5
 19000   -7.8  18.0   275   15    8   8.7   4.8   22.8  73.0    -6.3   1024  5.2
 18500   -6.5  20.3   280   14    7   8.7   4.8   22.6  72.7    -6.4    969  4.9
 18000   -5.1  22.8   285   14    7   9.0   4.9   22.5  72.4    -6.6    915  4.6
 17500   -3.7  25.3   295   14    7   9.2   5.0   22.4  72.2    -6.7    858  4.4
 17000   -2.4  27.7   300   14    7   9.2   5.0   22.3  72.1    -6.8    802  4.1
 16500   -1.0  30.2   305   14    7   9.4   5.2   22.2  72.0    -6.9    745  3.8
 16000    0.4  32.7   310   13    7   9.4   5.2   22.1  71.9    -7.0    688  3.5
 15500    2.5  36.5   315   12    6   9.2   5.0   22.0  71.6    -7.2    605  3.1
 15000    3.8  38.8   315   10    5   9.4   5.2   21.9  71.5    -7.4    551  2.8
 14500    5.0  41.0   310    9    5   7.4   4.0   21.8  71.2    -7.7    500  2.5
 14000    6.0  42.8   305    7    4   7.5   4.1   21.4  70.4    -8.3    457  2.3
 13500    6.8  44.2   290    5    3   6.1   3.3   20.9  69.7    -8.9    415  2.1
 13000    7.3  45.1   255    4    2   3.9   2.1   20.1  68.2    -9.9    386  2.0
 12500    7.7  45.9   215    4    2   4.8   2.6   19.3  66.7   -11.0    359  1.8
 12000    8.4  47.1   185    4    2   5.0   2.8   18.6  65.5   -11.9    325  1.7
 11750    8.7  47.7   165    4    2   5.0   2.7   18.2  64.8   -12.4    309  1.6
 11500    9.0  48.2   150    5    2   4.2   2.3   17.8  64.1   -12.8    293  1.5
 11250    9.2  48.6   140    5    3   3.1   1.7   17.3  63.2   -13.4    278  1.4
 11000    9.4  48.9   135    5    3   3.8   2.1   16.9  62.3   -13.9    264  1.3
 10750    9.6  49.3   125    6    3   1.8   1.0   16.4  61.5   -14.4    250  1.3
 10500    9.7  49.5   115    6    3   1.5   0.8   15.7  60.3   -15.2    242  1.2
 10250    9.8  49.6   105    5    2   3.2   1.7   15.2  59.3   -15.8    230  1.2
 10000   10.0  50.0   095    4    2   3.2   1.8   14.6  58.4   -16.4    217  1.1
  9750   10.2  50.4   075    4    2   2.1   1.1   14.1  57.5   -17.0    204  1.0
  9500   10.3  50.5   055    4    2   4.7   2.6   13.6  56.5   -17.6    192  1.0
  9250   11.0  51.8   050    4    2  12.8   7.0   13.5  56.4   -17.7    166  0.8
  9000   11.6  52.9   050    4    2  -2.6  -1.4   13.5  56.2   -17.9    139  0.7
  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 * * * * * *

           07/07/2025 at 0900 MDT          |       07/07/2025 at 1200 MDT
                                           |
CAPE... +1146.9    LI...       -4.8        | CAPE...  +474.2    LI...       -1.9
CINH...   -87.0    K Index... +13.1        | CINH...    -0.1    K Index... +24.3
                                           |
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 -63.6 -82.5  250  27 14   1.9   1.1 | -64.1 -83.4  250  34 17   1.9   1.0
 45000 -58.3 -72.9  255  52 27   6.2   3.4 | -58.6 -73.5  260  58 30   6.6   3.6
 40000 -49.0 -56.2  270  66 34   6.0   3.3 | -48.8 -55.8  270  66 34   6.0   3.3
 38000 -45.4 -49.7  270  63 33   6.0   3.3 | -45.2 -49.4  270  64 33   6.0   3.3
 36000 -41.8 -43.2  270  60 31   6.1   3.4 | -41.6 -42.9  270  62 32   6.2   3.4
 34000 -38.6 -37.5  270  55 29   5.3   2.9 | -38.5 -37.3  275  57 29   4.9   2.7
 32000 -35.4 -31.7  270  50 26   5.3   2.9 | -35.6 -32.1  275  51 26   4.9   2.7
 30000 -31.6 -24.9  270  41 21   5.7   3.1 | -31.4 -24.5  275  43 22   6.5   3.6
 29000 -29.9 -21.8  275  37 19   5.7   3.1 | -29.4 -20.9  275  38 20   6.5   3.6
 28000 -28.2 -18.8  275  33 17   6.3   3.5 | -27.5 -17.5  275  34 18   5.2   2.9
 27000 -26.3 -15.3  275  28 14   6.4   3.5 | -26.0 -14.8  275  29 15   5.2   2.9
 26000 -24.4 -11.9  275  23 12   6.4   3.5 | -24.4 -11.9  270  24 12   5.2   2.9
 25000 -22.5  -8.5  270  19 10   6.8   3.7 | -22.9  -9.2  270  19 10   6.4   3.5
 24000 -20.3  -4.5  265  19 10   7.3   4.0 | -20.5  -4.9  265  20 10   8.0   4.4
 23000 -18.2  -0.8  260  21 11   7.4   4.1 | -18.2  -0.8  265  21 11   8.1   4.4
 22000 -16.0   3.2  255  22 11   8.3   4.6 | -15.8   3.6  265  22 11   8.5   4.7
 21000 -13.4   7.9  255  21 11   9.1   5.0 | -13.2   8.2  270  22 11   8.8   4.8
 20000 -10.7  12.7  255  19 10   9.1   5.0 | -10.7  12.7  270  21 11   8.8   4.8
 19500  -9.4  15.1  255  19 10   9.1   5.0 |  -9.4  15.1  270  21 11   8.8   4.8
 19000  -8.0  17.6  260  18  9   8.8   4.8 |  -8.1  17.4  270  19 10   8.8   4.8
 18500  -6.7  19.9  265  17  9   8.8   4.9 |  -6.8  19.8  275  17  9   8.8   4.8
 18000  -5.4  22.3  270  16  8   9.0   4.9 |  -5.5  22.1  275  15  8   9.5   5.2
 17500  -4.0  24.8  280  16  8   9.1   5.0 |  -4.1  24.6  280  14  7   9.7   5.3
 17000  -2.6  27.3  285  15  8   9.1   5.0 |  -2.7  27.1  280  12  6   9.8   5.4
 16500  -1.2  29.8  290  15  8   9.3   5.1 |  -1.2  29.8  280  11  6   9.8   5.4
 16000   0.2  32.4  295  14  7   9.3   5.1 |   0.2  32.4  285  11  6   9.8   5.4
 15500   2.3  36.1  300  13  6   9.5   5.2 |   1.7  35.1  285  10  5   9.5   5.2
 15000   3.8  38.8  305  11  6   9.6   5.3 |   3.8  38.8  285   9  5   9.3   5.1
 14500   5.1  41.2  305  10  5   8.7   4.8 |   5.1  41.2  290   8  4   9.7   5.3
 14000   6.5  43.7  310  10  5   9.3   5.1 |   6.6  43.9  290   8  4  10.1   5.6
 13500   8.0  46.4  310  10  5  11.3   6.2 |   8.2  46.8  290   7  4  11.3   6.2
 13000   9.4  48.9  305  10  5   7.3   4.0 |   9.7  49.5  290   7  3   8.8   4.8
 12500  10.5  50.9  300   9  5   5.8   3.2 |  11.1  52.0  290   6  3  10.0   5.5
 12000  11.0  51.8  290   9  5   3.8   2.1 |  12.6  54.7  290   6  3   9.7   5.3
 11750  11.1  52.0  285   9  4   1.9   1.1 |  13.3  55.9  295   6  3   9.2   5.1
 11500  11.1  52.0  280   8  4   1.2   0.7 |  14.0  57.2  295   6  3   9.6   5.3
 11250  10.9  51.6  275   7  4  -0.0  -0.0 |  14.7  58.5  295   5  3   9.7   5.3
 11000  10.8  51.4  275   6  3   0.9   0.5 |  15.5  59.9  295   5  3   9.7   5.3
 10750  10.7  51.3  270   5  3   0.4   0.2 |  16.2  61.2  295   5  3  10.8   5.9
 10500  10.6  51.1  265   4  2   3.6   2.0 |  17.0  62.6  300   5  2  11.4   6.3
 10250  11.0  51.8  270   4  2   6.4   3.5 |  17.9  64.2  300   5  2  10.8   5.9
 10000  11.4  52.5  275   4  2   6.1   3.3 |  18.7  65.7  300   4  2  11.4   6.3
  9750  11.8  53.2  280   3  2   4.6   2.5 |  19.5  67.1  300   4  2   9.6   5.3
  9500  12.2  54.0  285   3  2  11.8   6.5 |  20.4  68.7  305   4  2  17.3   9.5
  9250  13.7  56.7  290   3  2  28.5  15.6 |  22.3  72.1  300   4  2  35.2  19.3
  9000  15.2  59.4  290   3  1  -2.6  -1.4 |  24.3  75.7  300   4  2   2.1   1.2
  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

           07/07/2025 at 1500 MDT          |       07/07/2025 at 1800 MDT
                                           |
CAPE...  +127.5    LI...       -0.4        | CAPE...  +247.1    LI...       -1.0
CINH...   -30.8    K Index... +25.3        | CINH...   -60.0    K Index... +23.6
                                           |
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 -64.8 -84.6  255  33 17   2.4   1.3 | -63.9 -83.0  270  33 17   2.6   1.4
 45000 -58.7 -73.7  270  54 28   6.7   3.7 | -58.0 -72.4  275  51 26   6.3   3.5
 40000 -48.7 -55.7  275  66 34   6.1   3.3 | -48.5 -55.3  275  65 34   6.2   3.4
 38000 -45.0 -49.0  275  65 33   6.1   3.3 | -44.8 -48.6  275  65 33   6.2   3.4
 36000 -41.3 -42.3  275  64 33   6.2   3.4 | -41.0 -41.8  280  64 33   6.3   3.5
 34000 -38.6 -37.5  270  56 29   4.4   2.4 | -37.8 -36.0  275  52 27   4.6   2.5
 32000 -35.6 -32.1  265  46 24   5.1   2.8 | -35.0 -31.0  265  41 21   5.3   2.9
 30000 -31.5 -24.7  265  38 19   7.0   3.8 | -31.1 -24.0  265  32 17   6.8   3.7
 29000 -29.5 -21.1  265  34 17   7.0   3.9 | -29.1 -20.4  265  28 14   6.8   3.8
 28000 -27.4 -17.3  265  30 15   6.9   3.8 | -27.0 -16.6  265  24 12   7.1   3.9
 27000 -25.3 -13.5  265  24 13   7.0   3.8 | -24.9 -12.8  270  22 11   7.1   3.9
 26000 -23.3  -9.9  270  19 10   7.0   3.8 | -22.8  -9.0  275  20 10   7.1   3.9
 25000 -21.2  -6.2  275  15  8   7.8   4.3 | -20.7  -5.3  285  18  9   7.5   4.1
 24000 -18.7  -1.7  280  13  7   8.5   4.7 | -18.4  -1.1  285  15  8   7.9   4.3
 23000 -16.2   2.8  285  12  6   8.5   4.7 | -16.0   3.2  290  13  6   7.9   4.3
 22000 -13.7   7.3  290  11  6   7.6   4.2 | -13.7   7.3  295  10  5   7.4   4.1
 21000 -11.7  10.9  290  11  6   7.1   3.9 | -11.6  11.1  300   9  5   7.1   3.9
 20000  -9.6  14.7  290  10  5   7.2   3.9 |  -9.5  14.9  300   8  4   7.2   3.9
 19500  -8.5  16.7  290  10  5   7.4   4.1 |  -8.5  16.7  300   8  4   7.2   4.0
 19000  -7.3  18.9  285   9  5   8.6   4.7 |  -7.4  18.7  300   8  4   7.8   4.3
 18500  -6.1  21.0  285   9  5   8.5   4.7 |  -6.3  20.7  300   8  4   7.7   4.2
 18000  -4.8  23.4  285   9  5   9.3   5.1 |  -5.1  22.8  300   8  4   8.3   4.5
 17500  -3.3  26.1  280   9  4   9.5   5.2 |  -3.9  25.0  295   9  5   8.5   4.7
 17000  -1.9  28.6  280   8  4   9.6   5.2 |  -1.9  28.6  295  10  5   9.2   5.0
 16500  -0.4  31.3  280   8  4   9.7   5.3 |  -0.5  31.1  290  11  5   9.4   5.1
 16000   1.0  33.8  275   8  4   9.7   5.3 |   0.9  33.6  290  11  6   9.5   5.2
 15500   2.5  36.5  275   8  4   9.7   5.3 |   2.4  36.3  290  12  6   9.6   5.3
 15000   4.7  40.5  270   8  4   9.6   5.3 |   3.8  38.8  285  12  6   9.7   5.3
 14500   6.0  42.8  265   8  4   9.0   4.9 |   5.1  41.2  285  12  6   8.8   4.8
 14000   7.4  45.3  265   8  4   9.5   5.2 |   6.6  43.9  285  12  6   9.7   5.3
 13500   8.9  48.0  260   8  4  10.3   5.6 |   8.1  46.6  280  12  6  10.8   5.9
 13000  10.3  50.5  255   8  4   8.6   4.7 |   9.5  49.1  280  12  6   8.5   4.7
 12500  11.6  52.9  255   8  4   9.2   5.0 |  10.9  51.6  280  12  6   9.5   5.2
 12000  13.0  55.4  250   9  5   9.2   5.0 |  12.3  54.1  275  12  6   8.3   4.5
 11750  13.7  56.7  250   9  5   9.1   5.0 |  12.8  55.0  275  12  6   6.5   3.5
 11500  14.3  57.7  245   9  5   8.4   4.6 |  13.4  56.1  275  12  6   7.4   4.0
 11250  14.9  58.8  245   9  5   7.9   4.3 |  13.9  57.0  270  12  6   7.5   4.1
 11000  15.5  59.9  240  10  5   8.0   4.4 |  14.4  57.9  270  12  6   7.7   4.2
 10750  16.1  61.0  240  10  5   9.0   5.0 |  15.0  59.0  265  12  6   6.4   3.5
 10500  16.8  62.2  240  10  5   9.9   5.4 |  15.3  59.5  260  12  6   6.1   3.4
 10250  17.6  63.7  235  10  5   9.6   5.2 |  15.8  60.4  260  12  6   7.1   3.9
 10000  18.3  64.9  235  10  5   9.9   5.4 |  16.3  61.3  255  11  6   6.6   3.6
  9750  19.0  66.2  235  10  5   8.9   4.9 |  16.7  62.1  255  11  5   7.9   4.3
  9500  19.7  67.5  235  10  5  11.3   6.2 |  17.3  63.1  250  10  5   6.5   3.6
  9250  20.8  69.4  235   9  5  18.0   9.8 |  17.5  63.5  245   7  4   1.1   0.6
  9000  21.8  71.2  235   8  4   5.3   2.9 |  17.7  63.9  230   5  2  11.8   6.5
  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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