Soaring Guidance
Issued by NWS Pueblo, CO

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000
UXUS97 KPUB 231103
SRGPUB

Soaring Forecast
National Weather Service Pueblo, Colorado
0402 MST Friday, January 23, 2015

This forecast is for Friday, January 23, 2015:

If the trigger temperature of 40.7 F/4.8 C is reached...then
   Thermal Soaring Index....................... Poor
   Maximum rate of lift........................ 0 ft/min (0.0 m/s)
   Maximum height of thermals.................. 10016 ft MSL (3258 ft AGL)

Forecast maximum temperature................... 39.0 F/4.3 C
Time of trigger temperature.................... None
Time of overdevelopment........................ 1100 MST
Middle/high clouds during soaring window....... Broken/overcast opaque middle
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 7825 ft MSL (1067 ft AGL)
Thermal soaring outlook for Saturday 01/24..... Poor

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

Remarks...

Sunrise/Sunset.................... 07:12:08 / 17:08:37 MST
Total possible sunshine........... 9 hr 56 min 29 sec (596 min 29 sec)
Altitude of sun at 12:10:45 MST... 31.72 degrees

Upper air data from numerical model forecast valid on 01/23/2015 at 0500 MST

Freezing level.................. Entire airmass below 32 F / 0 C
Convective condensation level... 21831 ft MSL (15073 ft AGL)
Lifted condensation level....... 16392 ft MSL (9634 ft AGL)
Lifted index.................... +11.3
K index......................... +2.7

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  -58.1 -72.6   355   18    9   1.9   1.0      M     M       M      M    M
 45000  -55.3 -67.5   360   27   14   2.4   1.3      M     M       M      M    M
 40000  -57.8 -72.0   020   34   18  -1.9  -1.0      M     M       M      M    M
 38000  -58.3 -72.9   020   38   20   1.4   0.8      M     M       M      M    M
 36000  -57.4 -71.3   020   42   22   1.4   0.8      M     M       M      M    M
 34000  -55.9 -68.6   015   46   24   9.1   5.0      M     M       M      M    M
 32000  -50.9 -59.6   020   44   22   8.3   4.6      M     M       M      M    M
 30000  -45.9 -50.6   020   42   21   7.6   4.1   24.2  75.6    15.6      M    M
 29000  -43.6 -46.5   020   41   21   7.6   4.2   23.3  73.9    15.0      M    M
 28000  -41.3 -42.3   020   40   21   7.6   4.2   22.5  72.5    14.6      M    M
 27000  -39.0 -38.2   020   39   20   7.6   4.2   21.8  71.3    14.2      M    M
 26000  -36.7 -34.1   020   38   20   7.7   4.2   21.0  69.7    13.7      M    M
 25000  -34.4 -29.9   020   37   19   7.7   4.2   20.2  68.3    13.2      M    M
 24000  -32.1 -25.8   020   35   18   7.7   4.2   19.5  67.1    12.8      M    M
 23000  -29.8 -21.6   020   35   18   7.8   4.3   18.7  65.7    12.3      M    M
 22000  -27.5 -17.5   020   34   18   7.8   4.3   18.0  64.4    11.9      M    M
 21000  -25.2 -13.4   020   34   17   7.2   4.0   17.4  63.3    11.5      M    M
 20000  -23.2  -9.8   020   34   18   6.7   3.7   16.2  61.2    10.6      M    M
 19500  -22.2  -8.0   020   35   18   6.7   3.7   15.7  60.3    10.2      M    M
 19000  -21.2  -6.2   020   35   18   6.7   3.7   15.2  59.4     9.8      M    M
 18500  -20.2  -4.4   020   35   18   6.7   3.7   14.8  58.6     9.4      M    M
 18000  -19.2  -2.6   020   35   18   6.5   3.6   14.2  57.6     9.0      M    M
 17500  -18.2  -0.8   020   35   18   6.5   3.6   13.7  56.6     8.5      M    M
 17000  -17.3   0.9   020   34   18   6.1   3.4   13.1  55.6     8.0      M    M
 16500  -15.9   3.4   020   33   17   6.2   3.4   12.2  53.9     7.3      M    M
 16000  -15.1   4.8   020   32   16   5.0   2.7   11.5  52.7     6.7      M    M
 15500  -14.4   6.1   020   30   16   4.9   2.7   10.7  51.3     6.0      M    M
 15000  -13.5   7.7   015   29   15   7.3   4.0   10.1  50.2     5.4      M    M
 14500  -12.4   9.7   015   29   15   7.3   4.0    9.7  49.4     5.1      M    M
 14000  -11.3  11.7   015   28   14   7.3   4.0    9.3  48.7     4.7      M    M
 13500  -10.2  13.6   010   28   14   7.3   4.0    8.9  48.0     4.4      M    M
 13000   -9.1  15.6   010   28   14   6.2   3.4    8.5  47.3     4.1      M    M
 12500   -8.2  17.2   005   28   14   5.9   3.2    7.8  46.1     3.5      M    M
 12000   -7.5  18.5   005   28   14   3.8   2.1    7.1  44.7     2.8      M    M
 11750   -7.2  19.0   005   28   14   3.8   2.1    6.6  43.9     2.4      M    M
 11500   -6.9  19.6   360   27   14   3.7   2.0    6.1  43.0     1.9      M    M
 11250   -6.6  20.1   360   27   14   4.3   2.4    5.7  42.2     1.5      M    M
 11000   -6.2  20.8   360   27   14   5.5   3.0    5.3  41.5     1.1      M    M
 10750   -5.8  21.6   360   26   14   5.5   3.0    5.0  40.9     0.9      M    M
 10500   -5.4  22.3   360   26   13   5.0   2.8    4.6  40.3     0.5      M    M
 10250   -5.0  23.0   005   25   13   5.7   3.1    4.3  39.7     0.2      M    M
 10000   -4.5  23.9   005   24   13   7.1   3.9    4.0  39.2    -0.1    257  1.3
  9750   -3.9  25.0   005   24   12   7.6   4.2    3.8  38.9    -0.2    233  1.2
  9500   -3.4  25.9   005   24   12   7.6   4.2    3.7  38.6    -0.4    209  1.1
  9250   -2.8  27.0   005   23   12   7.0   3.8    3.5  38.3    -0.6    185  0.9
  9000   -2.3  27.9   005   23   12   6.0   3.3    3.2  37.8    -0.8    163  0.8
  8750   -1.9  28.6   360   22   12   6.5   3.6    2.9  37.3    -1.1    141  0.7
  8500   -1.4  29.5   355   22   11   6.5   3.6    2.7  36.9    -1.3    118  0.6
  8250   -1.0  30.2   345   22   11   2.4   1.3    2.3  36.2    -1.7    100  0.5
  8000   -1.0  30.2   340   22   11  -3.4  -1.9    1.5  34.8    -2.5     94  0.5
  7750   -1.1  30.0   335   23   12   7.3   4.0    0.8  33.4    -3.3     89  0.4
  7500   -0.5  31.1   330   23   12  -5.7  -3.1    0.6  33.1    -3.4     65  0.3
  7250   -2.4  27.7   325   19   10 -36.2 -19.8   -1.7  29.0    -5.7    114  0.6
  7000   -5.1  22.8   320   15    8 -28.1 -15.4   -4.6  23.8    -8.7    186  0.9
  6750      M     M     M    M    M     M     M      M     M       M      M    M

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

           01/23/2015 at 0800 MST          |       01/23/2015 at 1100 MST
                                           |
K index... +10.4  LI... +2.4               | K index... +10.2  LI... +2.8
CAPE... 0.0  CIN... -0.2                   | CAPE... 0.0  CIN... M
                                           |
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 -57.8 -72.0  345  19 10   1.5   0.8 | -58.3 -72.9  345  14  7   1.4   0.8
 45000 -55.6 -68.1  355  27 14   1.9   1.0 | -56.1 -69.0  340  19 10   1.8   1.0
 40000 -58.6 -73.5  005  33 17  -2.1  -1.1 | -58.6 -73.5  350  27 14  -1.7  -0.9
 38000 -58.7 -73.7  010  36 18   2.4   1.3 | -58.5 -73.3  350  30 15   2.4   1.3
 36000 -57.3 -71.1  010  38 19   2.3   1.3 | -57.1 -70.8  350  32 16   2.4   1.3
 34000 -55.6 -68.1  010  39 20   7.7   4.2 | -55.3 -67.5  355  33 17   8.4   4.6
 32000 -50.9 -59.6  005  38 19   7.8   4.3 | -50.5 -58.9  355  33 17   8.0   4.4
 30000 -46.2 -51.2  360  36 19   8.2   4.5 | -45.7 -50.3  360  33 17   7.8   4.3
 29000 -43.8 -46.8  360  36 18   8.1   4.4 | -43.3 -45.9  360  32 17   7.9   4.3
 28000 -41.4 -42.5  360  35 18   8.1   4.4 | -40.4 -40.7  360  31 16   7.9   4.3
 27000 -38.3 -36.9  360  34 18   7.9   4.3 | -38.0 -36.4  360  30 15   7.6   4.1
 26000 -36.0 -32.8  360  33 17   7.7   4.2 | -35.9 -32.6  360  29 15   7.3   4.0
 25000 -33.7 -28.7  360  31 16   7.7   4.2 | -33.7 -28.7  355  28 14   7.3   4.0
 24000 -31.4 -24.5  360  30 15   7.6   4.2 | -31.5 -24.7  355  27 14   7.3   4.0
 23000 -29.3 -20.7  005  28 14   7.1   3.9 | -29.3 -20.7  355  25 13   7.3   4.0
 22000 -27.2 -17.0  005  26 14   7.2   3.9 | -27.1 -16.8  355  24 12   7.3   4.0
 21000 -25.1 -13.2  010  25 13   6.8   3.7 | -25.0 -13.0  350  22 11   7.0   3.8
 20000 -23.1  -9.6  010  25 13   6.6   3.6 | -22.9  -9.2  350  21 11   6.9   3.8
 19500 -22.1  -7.8  010  25 13   6.6   3.6 | -21.9  -7.4  350  21 11   6.9   3.8
 19000 -21.1  -6.0  015  25 13   6.6   3.6 | -20.9  -5.6  350  20 11   6.9   3.8
 18500 -20.2  -4.4  015  24 13   6.5   3.6 | -19.9  -3.8  355  20 10   6.9   3.8
 18000 -19.2  -2.6  015  25 13   6.4   3.5 | -18.9  -2.0  355  20 10   6.8   3.7
 17500 -18.3  -0.9  015  25 13   6.4   3.5 | -17.9  -0.2  355  20 10   6.8   3.7
 17000 -17.4   0.7  015  25 13   6.0   3.3 | -16.9   1.6  355  20 10   5.9   3.3
 16500 -16.5   2.3  015  26 13   6.0   3.3 | -16.0   3.2  355  19 10   6.0   3.3
 16000 -15.6   3.9  015  26 13   6.4   3.5 | -15.2   4.6  355  19 10   5.9   3.3
 15500 -14.7   5.5  015  26 13   6.5   3.5 | -14.3   6.3  355  19 10   6.0   3.3
 15000 -13.7   7.3  015  25 13   6.8   3.7 | -13.4   7.9  355  19 10   6.5   3.6
 14500 -12.7   9.1  010  25 13   7.1   3.9 | -12.4   9.7  355  19 10   7.0   3.8
 14000 -11.7  10.9  010  25 13   7.2   3.9 | -10.8  12.6  355  18 10   6.7   3.7
 13500 -10.0  14.0  005  25 13   7.5   4.1 |  -9.9  14.2  355  19 10   6.7   3.7
 13000  -9.0  15.8  005  25 13   6.1   3.3 |  -8.9  16.0  355  19 10   5.7   3.2
 12500  -8.1  17.4  360  25 13   5.7   3.2 |  -8.1  17.4  355  19 10   5.6   3.1
 12000  -7.3  18.9  360  26 13   3.7   2.0 |  -7.3  18.9  355  19 10   4.5   2.4
 11750  -7.1  19.2  360  26 13   2.5   1.4 |  -7.0  19.4  355  19 10   3.8   2.1
 11500  -6.9  19.6  360  26 13   2.7   1.5 |  -6.7  19.9  355  18  9   3.9   2.1
 11250  -6.7  19.9  360  26 13   3.1   1.7 |  -6.4  20.5  355  18  9   4.3   2.3
 11000  -6.4  20.5  360  26 13   3.6   2.0 |  -6.1  21.0  355  18  9   3.7   2.0
 10750  -6.1  21.0  360  26 13   3.4   1.9 |  -5.8  21.6  355  19 10   2.7   1.5
 10500  -5.9  21.4  360  25 13   3.1   1.7 |  -5.6  21.9  355  19 10   2.6   1.4
 10250  -5.6  21.9  360  25 13   4.3   2.4 |  -5.4  22.3  355  19 10   3.3   1.8
 10000  -5.2  22.6  005  25 13   6.9   3.8 |  -5.1  22.8  360  19 10   4.7   2.6
  9750  -4.6  23.7  005  25 13   7.8   4.3 |  -4.7  23.5  360  20 10   4.9   2.7
  9500  -4.0  24.8  005  25 13   8.1   4.4 |  -4.4  24.1  360  20 10   4.7   2.6
  9250  -3.4  25.9  005  25 13   7.6   4.1 |  -4.0  24.8  360  20 10   5.5   3.0
  9000  -2.9  26.8  005  26 13   6.7   3.7 |  -3.5  25.7  005  21 11   5.9   3.2
  8750  -2.3  27.9  005  26 13   7.7   4.2 |  -3.1  26.4  005  21 11   7.1   3.9
  8500  -1.7  28.9  005  26 13   7.5   4.1 |  -2.5  27.5  005  21 11   8.3   4.6
  8250  -1.3  29.7  360  25 13   3.4   1.9 |  -1.9  28.6  005  20 10   7.5   4.1
  8000  -1.2  29.8  355  24 12  -2.3  -1.3 |  -1.3  29.7  360  19 10   6.9   3.8
  7750  -1.2  29.8  345  23 12   9.6   5.3 |  -0.8  30.6  355  18  9   8.7   4.8
  7500  -0.4  31.3  335  23 12  -4.0  -2.2 |  -0.2  31.6  350  16  8   4.4   2.4
  7250  -2.2  28.0  330  19 10 -34.7 -19.1 |  -0.3  31.5  345  13  7  -2.0  -1.1
  7000  -4.6  23.7  325  15  8 -21.6 -11.9 |  -0.4  31.3  340  11  6   2.3   1.3
  6750     M     M    M   M  M     M     M |     M     M    M   M  M     M     M

           01/23/2015 at 1400 MST          |       01/23/2015 at 1700 MST
                                           |
K index... +9.1  LI... +3.1                | K index... +9.9  LI... +3.4
CAPE... 0.0  CIN... M                      | CAPE... 0.0  CIN... -0.8
                                           |
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 -58.6 -73.5  330  18  9   1.3   0.7 | -58.5 -73.3  345  25 13   1.4   0.8
 45000 -56.7 -70.1  335  26 13   1.6   0.9 | -56.4 -69.5  340  31 16   1.7   0.9
 40000 -57.7 -71.9  330  25 13  -0.8  -0.4 | -57.3 -71.1  330  27 14  -0.7  -0.4
 38000 -57.7 -71.9  325  26 13   1.1   0.6 | -57.3 -71.1  320  27 14   0.8   0.4
 36000 -57.1 -70.8  325  28 14   1.1   0.6 | -56.8 -70.2  305  31 16   0.8   0.4
 34000 -56.0 -68.8  325  30 15   8.9   4.9 | -55.9 -68.6  300  35 18   7.8   4.3
 32000 -50.9 -59.6  330  28 15   8.5   4.7 | -51.3 -60.3  305  31 16   7.8   4.3
 30000 -45.8 -50.4  335  27 14   7.9   4.4 | -46.6 -51.9  310  28 14   8.3   4.5
 29000 -43.4 -46.1  340  27 14   8.0   4.4 | -44.1 -47.4  315  26 14   8.3   4.5
 28000 -40.4 -40.7  345  26 13   8.0   4.4 | -41.0 -41.8  320  25 13   8.3   4.5
 27000 -38.0 -36.4  345  26 13   7.8   4.3 | -38.5 -37.3  325  24 12   8.0   4.4
 26000 -35.8 -32.4  350  24 13   7.6   4.2 | -36.2 -33.2  330  22 11   7.8   4.3
 25000 -33.5 -28.3  350  23 12   7.6   4.2 | -33.9 -29.0  335  21 11   7.8   4.3
 24000 -31.2 -24.2  355  22 11   7.5   4.1 | -31.6 -24.9  340  19 10   7.8   4.3
 23000 -29.1 -20.4  355  21 11   7.3   4.0 | -29.2 -20.6  340  18  9   7.9   4.3
 22000 -26.9 -16.4  360  20 10   7.3   4.0 | -26.9 -16.4  345  17  9   7.9   4.3
 21000 -24.7 -12.5  360  19 10   6.8   3.7 | -24.5 -12.1  350  17  8   7.2   3.9
 20000 -22.8  -9.0  355  19 10   6.7   3.7 | -22.5  -8.5  350  16  8   7.0   3.8
 19500 -21.8  -7.2  350  19 10   6.7   3.7 | -21.4  -6.5  355  16  8   7.0   3.8
 19000 -20.8  -5.4  350  19 10   6.7   3.7 | -20.4  -4.7  355  16  8   7.0   3.8
 18500 -19.8  -3.6  350  18 10   6.3   3.5 | -19.4  -2.9  355  16  8   6.6   3.6
 18000 -18.9  -2.0  345  19 10   6.0   3.3 | -18.4  -1.1  355  17  9   6.3   3.5
 17500 -18.0  -0.4  345  19 10   6.0   3.3 | -17.5   0.5  355  17  9   6.3   3.5
 17000 -17.1   1.2  345  19 10   6.3   3.5 | -16.6   2.1  355  18  9   6.5   3.6
 16500 -16.2   2.8  345  20 10   6.3   3.5 | -15.6   3.9  350  18  9   6.5   3.6
 16000 -15.2   4.6  345  20 11   6.5   3.6 | -14.7   5.5  350  19 10   5.8   3.2
 15500 -14.3   6.3  345  21 11   6.6   3.6 | -13.9   7.0  350  19 10   5.7   3.1
 15000 -13.3   8.1  345  21 11   6.4   3.5 | -13.0   8.6  350  20 10   5.4   3.0
 14500 -12.4   9.7  340  22 11   6.3   3.5 | -12.3   9.9  350  21 11   5.2   2.9
 14000 -11.0  12.2  340  22 12   5.8   3.2 | -11.1  12.0  345  23 12   5.6   3.1
 13500 -10.2  13.6  340  23 12   5.7   3.2 | -10.3  13.5  345  23 12   5.7   3.1
 13000  -9.3  15.3  340  23 12   6.2   3.4 |  -9.5  14.9  345  24 12   4.6   2.5
 12500  -8.3  17.1  340  23 12   6.5   3.6 |  -8.8  16.2  345  25 13   4.5   2.5
 12000  -7.5  18.5  340  23 12   4.9   2.7 |  -8.2  17.2  345  26 13   3.8   2.1
 11750  -7.1  19.2  340  23 12   5.2   2.9 |  -7.9  17.8  345  26 13   3.6   2.0
 11500  -6.7  19.9  340  23 12   5.4   2.9 |  -7.6  18.3  345  26 14   3.7   2.0
 11250  -6.3  20.7  340  23 12   4.6   2.5 |  -7.4  18.7  345  27 14   3.5   1.9
 11000  -6.0  21.2  340  23 12   3.3   1.8 |  -7.1  19.2  345  27 14   3.4   1.9
 10750  -5.7  21.7  340  23 12   3.3   1.8 |  -6.8  19.8  350  27 14   3.7   2.1
 10500  -5.5  22.1  340  23 12   3.4   1.9 |  -6.6  20.1  350  27 14   3.7   2.0
 10250  -5.2  22.6  340  23 12   3.2   1.7 |  -6.3  20.7  350  28 14   4.0   2.2
 10000  -5.0  23.0  340  23 12   2.9   1.6 |  -6.0  21.2  355  28 14   4.5   2.5
  9750  -4.8  23.4  345  23 12   3.6   2.0 |  -5.6  21.9  355  28 15   5.0   2.8
  9500  -4.5  23.9  345  22 12   3.6   2.0 |  -5.2  22.6  360  29 15   5.3   2.9
  9250  -4.2  24.4  345  22 11   5.1   2.8 |  -4.8  23.4  360  29 15   5.4   3.0
  9000  -3.7  25.3  350  22 11   5.9   3.3 |  -4.4  24.1  360  28 15   4.9   2.7
  8750  -3.3  26.1  350  22 11   7.7   4.2 |  -4.0  24.8  005  28 14   6.9   3.8
  8500  -2.6  27.3  350  22 11   9.8   5.4 |  -3.4  25.9  005  27 14   8.1   4.5
  8250  -1.9  28.6  350  21 11   8.6   4.7 |  -2.9  26.8  360  25 13   6.7   3.7
  8000  -1.3  29.7  350  19 10   8.0   4.4 |  -2.4  27.7  360  24 12   5.3   2.9
  7750  -0.7  30.7  350  18  9   9.6   5.3 |  -1.9  28.6  355  22 11   9.2   5.1
  7500  -0.1  31.8  350  17  9   5.9   3.2 |  -1.4  29.5  355  21 11  -1.1  -0.6
  7250   0.0  32.0  345  14  7   0.5   0.3 |  -2.2  28.0  350  17  9 -15.0  -8.2
  7000   0.1  32.2  345  12  6   4.4   2.4 |  -3.0  26.6  345  13  7  -4.1  -2.3
  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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