Soaring Guidance
Issued by NWS Denver/Boulder, CO

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000
UXUS97 KBOU 290135
SRGBOU

Soaring Forecast
National Weather Service Denver/Boulder, Colorado
1935 MDT Sunday, June 28, 2015

This forecast is for Monday, June 29, 2015:

If the trigger temperature of 82.6 F/28.1 C is reached...then
   Thermal Soaring Index....................... Excellent
   Maximum rate of lift........................ 1240 ft/min (6.3 m/s)
   Maximum height of thermals.................. 16659 ft MSL (11352 ft AGL)

Forecast maximum temperature................... 90.0 F/32.7 C
Time of trigger temperature.................... 1115 MDT
Time of overdevelopment........................ 1500 MDT
Middle/high clouds during soaring window....... None
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 11089 ft MSL (5782 ft AGL)
Thermal soaring outlook for Tuesday 06/30...... Excellent

Wave Soaring Index............................. Poor
Wave Soaring Index trend (to 1800 MDT)......... No change
Height of stable layer (12-18K ft MSL)......... None
Weak PVA/NVA (through 1800 MDT)................ Weak NVA
Potential height of wave....................... 26449 ft MSL (21142 ft AGL)
Wave soaring outlook for Tuesday 06/30......... Poor

Remarks...

Sunrise/Sunset.................... 05:34:17 / 20:31:32 MDT
Total possible sunshine........... 14 hr 57 min 15 sec (897 min 15 sec)
Altitude of sun at 13:02:58 MDT... 73.41 degrees

Upper air data from numerical model forecast valid on 06/29/2015 at 0600 MDT

Freezing level.................. 15816 ft MSL (10509 ft AGL)
Convective condensation level... 15627 ft MSL (10320 ft AGL)
Lifted condensation level....... 16069 ft MSL (10762 ft AGL)
Lifted index.................... -2.6
K index......................... +25.2

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  -62.9 -81.2   010   22   11   3.9   2.1      M     M       M      M    M
 45000  -58.0 -72.4   360   33   17   1.8   1.0      M     M       M      M    M
 40000  -54.1 -65.4   360   57   29   7.5   4.1      M     M       M      M    M
 38000  -49.7 -57.5   355   58   30   7.5   4.1      M     M       M      M    M
 36000  -45.2 -49.4   355   59   31   7.6   4.2      M     M       M      M    M
 34000  -40.2 -40.4   360   56   29   8.4   4.6      M     M       M      M    M
 32000  -35.1 -31.2   360   52   27   8.4   4.6      M     M       M      M    M
 30000  -29.3 -20.7   005   48   25   8.7   4.8   46.4 115.4    10.8      M    M
 29000  -26.7 -16.1   005   47   24   8.7   4.8   46.0 114.9    10.6      M    M
 28000  -24.2 -11.6   360   45   23   6.1   3.3   45.5 113.8    10.3      M    M
 27000  -22.3  -8.1   355   41   21   6.4   3.5   44.1 111.3     9.3      M    M
 26000  -20.5  -4.9   350   37   19   6.4   3.5   42.8 109.1     8.4      M    M
 25000  -18.6  -1.5   345   33   17   6.4   3.5   41.7 107.1     7.6      M    M
 24000  -16.7   1.9   345   31   16   6.4   3.5   40.3 104.6     6.5      M    M
 23000  -14.9   5.2   340   29   15   6.5   3.5   39.1 102.4     5.4      M    M
 22000  -13.0   8.6   340   27   14   6.6   3.6   38.1 100.5     4.5      M    M
 21000  -11.1  12.0   340   25   13   6.7   3.7   36.9  98.4     3.5      M    M
 20000   -9.2  15.4   340   23   12   6.7   3.7   35.8  96.5     2.6      M    M
 19500   -8.2  17.2   340   22   11   6.8   3.7   35.3  95.6     2.1      M    M
 19000   -7.1  19.2   340   21   11   7.8   4.3   34.9  94.8     1.8      M    M
 18500   -6.0  21.2   335   20   11   7.7   4.2   34.6  94.2     1.5      M    M
 18000   -4.8  23.4   335   20   10   7.2   4.0   34.2  93.6     1.2      M    M
 17500   -3.7  25.3   335   17    9   7.0   3.8   33.7  92.7     0.8      M    M
 17000   -2.7  27.1   325   14    7   6.9   3.8   33.3  91.9     0.4      M    M
 16500   -1.7  28.9   325   12    6   7.1   3.9   32.8  91.0    -0.0   1036  5.3
 16000   -0.1  31.8   320   11    6   7.4   4.1   32.1  89.8    -0.7    968  4.9
 15500    1.1  34.0   320   11    5   8.9   4.9   31.9  89.4    -1.0    917  4.7
 15000    2.3  36.1   325   10    5   8.8   4.9   31.7  89.1    -1.2    865  4.4
 14500    3.6  38.5   325    9    5   9.3   5.1   31.6  88.9    -1.4    811  4.1
 14000    4.9  40.8   325    9    5   9.4   5.1   31.5  88.8    -1.5    758  3.8
 13500    6.2  43.2   320    8    4   8.3   4.5   31.4  88.5    -1.7    705  3.6
 13000    7.3  45.1   315    6    3   8.0   4.4   31.1  88.0    -2.1    656  3.3
 12500    8.5  47.3   305    4    2   8.0   4.4   30.9  87.6    -2.3    606  3.1
 12000    9.7  49.5   275    2    1   8.0   4.4   30.6  87.0    -2.6    555  2.8
 11500   10.9  51.6   220    2    1   8.3   4.6   30.3  86.6    -2.9    504  2.6
 11000   12.2  54.0   205    3    1   8.4   4.6   30.1  86.2    -3.0    450  2.3
 10500   13.5  56.3   200    3    2   4.7   2.6   30.0  85.9    -3.2    397  2.0
 10250   13.7  56.7   200    3    2   5.6   3.1   29.4  85.0    -3.7    383  1.9
 10000   14.4  57.9   195    3    2  11.0   6.0   29.4  85.0    -3.8    354  1.8
  9750   15.2  59.4   190    3    2  10.2   5.6   29.5  85.0    -3.8    325  1.6
  9500   15.9  60.6   185    4    2   8.1   4.5   29.5  85.1    -3.8    295  1.5
  9250   16.4  61.5   185    4    2   6.1   3.3   29.2  84.6    -4.0    273  1.4
  9000   16.9  62.4   180    4    2   8.7   4.8   29.0  84.3    -4.2    249  1.3
  8750   17.6  63.7   180    4    2   9.6   5.3   29.0  84.2    -4.2    221  1.1
  8500   18.3  64.9   175    4    2   8.2   4.5   29.0  84.1    -4.3    194  1.0
  8250   18.8  65.8   175    4    2   6.9   3.8   28.8  83.8    -4.5    170  0.9
  8000   19.4  66.9   175    4    2   8.2   4.5   28.6  83.5    -4.7    146  0.7
  7750   20.0  68.0   175    4    2   9.1   5.0   28.5  83.3    -4.8    119  0.6
  7500   20.7  69.3   170    4    2   8.1   4.4   28.4  83.2    -4.9     93  0.5
  7250   21.2  70.2   170    4    2   7.2   4.0   28.3  82.9    -5.1     69  0.4
  7000   21.8  71.2   165    3    2   8.6   4.7   28.1  82.6    -5.3     45  0.2
  6750   22.4  72.3   160    3    1   5.3   2.9   28.0  82.4    -5.4     20  0.1
  6500   22.4  72.3   160    2    1  -1.2  -0.7   27.3  81.2    -6.1     11  0.1
  6250   22.2  72.0   000    0    0  -1.0  -0.5   26.5  79.7    -7.0      9  0.0
  6000   22.1  71.8   320    2    1  -4.5  -2.4   25.6  78.1    -7.9      6  0.0
  5750   21.1  70.0   300    2    1 -16.1  -8.8   24.2  75.5    -9.6     27  0.1
  5500   19.2  66.6   245    2    1 -23.7 -13.0   21.9  71.3   -12.3     77  0.4

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

           06/29/2015 at 0900 MDT          |       06/29/2015 at 1200 MDT
                                           |
K index... +27.3  LI... -2.8               | K index... +25.4  LI... -3.5
CAPE... +345.8  CIN... -144.3              | CAPE... +738.5  CIN... -15.8
                                           |
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 -63.2 -81.8  360  20 10   3.9   2.1 | -62.5 -80.5  345  22 11   3.7   2.0
 45000 -58.1 -72.6  355  31 16   1.9   1.1 | -57.8 -72.0  345  31 16   1.6   0.9
 40000 -54.1 -65.4  005  53 27   7.3   4.0 | -54.2 -65.6  010  48 25   7.3   4.0
 38000 -49.8 -57.6  005  55 28   7.3   4.0 | -49.8 -57.6  005  51 26   7.3   4.0
 36000 -45.4 -49.7  005  57 30   7.5   4.1 | -45.4 -49.7  005  54 28   7.6   4.2
 34000 -40.2 -40.4  005  56 29   8.8   4.8 | -40.2 -40.4  005  53 27   8.7   4.8
 32000 -34.9 -30.8  360  55 28   8.8   4.8 | -34.3 -29.7  005  51 26   9.0   4.9
 30000 -29.2 -20.6  005  52 27   8.5   4.7 | -29.1 -20.4  005  47 24   8.7   4.8
 29000 -26.6 -15.9  010  51 26   8.5   4.7 | -26.5 -15.7  005  45 23   8.7   4.8
 28000 -24.2 -11.6  010  49 25   7.0   3.8 | -23.9 -11.0  005  43 22   7.8   4.3
 27000 -22.0  -7.6  010  46 24   7.2   3.9 | -21.6  -6.9  010  43 22   7.9   4.3
 26000 -19.9  -3.8  010  43 22   7.2   3.9 | -19.2  -2.6  010  42 22   7.9   4.3
 25000 -17.7   0.1  005  40 21   6.5   3.6 | -16.9   1.6  010  42 22   6.8   3.7
 24000 -16.0   3.2  360  36 18   5.9   3.2 | -15.1   4.8  010  38 20   5.9   3.3
 23000 -14.3   6.3  355  31 16   6.0   3.3 | -13.3   8.1  005  34 17   5.9   3.3
 22000 -12.6   9.3  345  28 14   6.0   3.3 | -11.5  11.3  360  30 16   5.3   2.9
 21000 -10.9  12.4  345  25 13   6.0   3.3 | -10.0  14.0  355  26 14   5.1   2.8
 20000  -9.2  15.4  345  22 11   6.1   3.3 |  -8.6  16.5  350  23 12   5.5   3.0
 19500  -8.3  17.1  340  21 11   6.2   3.4 |  -7.9  17.8  345  21 11   5.9   3.2
 19000  -7.3  18.9  340  20 10   7.9   4.3 |  -6.9  19.6  345  20 10   7.2   4.0
 18500  -6.2  20.8  335  20 10   7.8   4.3 |  -5.9  21.4  345  19 10   7.2   3.9
 18000  -5.1  22.8  335  20 10   8.1   4.4 |  -4.8  23.4  345  19 10   7.8   4.3
 17500  -3.9  25.0  330  19 10   8.3   4.5 |  -3.7  25.3  345  19 10   8.0   4.4
 17000  -2.7  27.1  325  18 10   8.2   4.5 |  -2.5  27.5  340  19 10   8.0   4.4
 16500  -1.7  28.9  325  17  9   6.5   3.6 |  -0.9  30.4  340  17  9   7.9   4.3
 16000  -0.2  31.6  320  14  7   6.7   3.7 |   0.2  32.4  335  16  8   7.5   4.1
 15500   0.8  33.4  320  12  6   6.6   3.6 |   1.1  34.0  335  14  7   6.2   3.4
 15000   1.8  35.2  325  10  5   6.4   3.5 |   2.1  35.8  335  12  6   6.2   3.4
 14500   3.0  37.4  330   8  4   9.1   5.0 |   3.0  37.4  335  10  5   6.9   3.8
 14000   4.2  39.6  340   7  3   8.8   4.8 |   4.1  39.4  340   8  4   6.7   3.7
 13500   5.5  41.9  345   5  3   8.6   4.7 |   5.2  41.4  345   6  3   9.0   4.9
 13000   6.7  44.1  350   3  2   8.6   4.7 |   6.5  43.7  345   4  2   9.2   5.1
 12500   8.0  46.4  005   2  1   8.7   4.8 |   7.8  46.0  350   2  1   8.9   4.9
 12000   9.3  48.7  100   1  0   8.8   4.8 |   9.1  48.4  095   1  1   8.8   4.9
 11500  10.6  51.1  140   2  1   8.5   4.7 |  10.4  50.7  125   3  2   8.4   4.6
 11000  11.8  53.2  135   3  2   8.1   4.4 |  11.6  52.9  130   4  2   8.1   4.4
 10500  13.0  55.4  130   4  2   3.5   1.9 |  12.8  55.0  130   5  3   3.6   2.0
 10250  13.2  55.8  130   4  2   5.6   3.1 |  13.0  55.4  130   5  3   6.9   3.8
 10000  14.0  57.2  130   5  2  12.4   6.8 |  13.9  57.0  125   5  3  13.3   7.3
  9750  14.8  58.6  125   5  3  11.0   6.0 |  14.7  58.5  125   5  3  11.6   6.3
  9500  15.6  60.1  125   5  3   8.8   4.8 |  15.5  59.9  125   5  3   9.0   4.9
  9250  16.1  61.0  125   5  3   6.7   3.7 |  16.0  60.8  125   5  3   7.4   4.1
  9000  16.7  62.1  125   5  3   9.3   5.1 |  16.7  62.1  120   5  2  10.2   5.6
  8750  17.4  63.3  125   5  3  10.1   5.6 |  17.4  63.3  115   5  2  10.8   5.9
  8500  18.1  64.6  120   5  3   8.8   4.8 |  18.1  64.6  115   4  2   9.6   5.3
  8250  18.7  65.7  120   5  3   8.2   4.5 |  18.8  65.8  105   4  2   9.2   5.1
  8000  19.3  66.7  115   5  2   8.0   4.4 |  19.4  66.9  100   4  2   9.4   5.2
  7750  19.8  67.6  115   4  2   6.7   3.7 |  20.0  68.0  095   3  2   9.9   5.4
  7500  20.3  68.5  110   4  2   5.5   3.0 |  20.8  69.4  090   3  2  10.3   5.6
  7250  20.6  69.1  105   4  2   4.4   2.4 |  21.5  70.7  090   3  2  10.8   5.9
  7000  21.0  69.8  095   4  2   6.4   3.5 |  22.3  72.1  085   3  2   9.3   5.1
  6750  21.4  70.5  085   4  2   3.5   1.9 |  23.0  73.4  085   3  2   9.3   5.1
  6500  21.3  70.3  070   3  1  -1.5  -0.8 |  23.8  74.8  080   3  1  11.1   6.1
  6250  21.0  69.8  045   2  1  -2.1  -1.1 |  24.6  76.3  080   3  1  10.7   5.8
  6000  20.8  69.4  360   2  1   1.0   0.5 |  25.3  77.5  075   3  1  11.3   6.2
  5750  21.1  70.0  350   2  1  11.1   6.1 |  26.4  79.5  075   3  1  17.1   9.4
  5500  22.2  72.0  340   2  1  18.8  10.3 |  27.9  82.2  070   3  1  25.0  13.7

           06/29/2015 at 1500 MDT          |       06/29/2015 at 1800 MDT
                                           |
K index... +21.0  LI... -2.1               | K index... +22.5  LI... -2.0
CAPE... +417.1  CIN... -16.8               | CAPE... +383.2  CIN... -23.8
                                           |
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 -62.2 -80.0  335  21 11   3.6   2.0 | -62.6 -80.7  330  25 13   3.3   1.8
 45000 -58.1 -72.6  340  32 17   1.2   0.6 | -58.3 -72.9  335  37 19   2.2   1.2
 40000 -54.8 -66.6  005  52 27   8.3   4.5 | -53.8 -64.8  360  49 25   7.6   4.2
 38000 -49.8 -57.6  010  52 27   8.2   4.5 | -49.3 -56.7  005  48 25   7.5   4.1
 36000 -44.9 -48.8  015  52 27   8.3   4.5 | -44.8 -48.6  010  48 24   7.8   4.3
 34000 -39.8 -39.6  010  49 25   8.4   4.6 | -38.9 -38.0  010  45 23   8.8   4.8
 32000 -34.1 -29.4  005  46 24   8.8   4.8 | -33.6 -28.5  010  42 22   8.6   4.7
 30000 -29.0 -20.2  005  42 22   8.5   4.6 | -28.8 -19.8  005  40 20   8.1   4.4
 29000 -26.5 -15.7  005  40 21   8.5   4.6 | -26.4 -15.5  005  39 20   8.1   4.4
 28000 -24.0 -11.2  005  39 20   7.9   4.3 | -24.0 -11.2  360  38 19   7.8   4.3
 27000 -21.6  -6.9  005  38 19   7.9   4.3 | -21.7  -7.1  360  37 19   7.8   4.3
 26000 -19.3  -2.7  005  37 19   7.9   4.3 | -19.3  -2.7  005  37 19   7.8   4.3
 25000 -16.9   1.6  005  36 19   6.8   3.7 | -17.0   1.4  005  37 19   7.3   4.0
 24000 -15.1   4.8  005  34 18   6.0   3.3 | -14.9   5.2  005  35 18   7.1   3.9
 23000 -13.3   8.1  005  33 17   6.0   3.3 | -12.8   9.0  005  32 17   7.1   3.9
 22000 -11.5  11.3  005  31 16   6.0   3.3 | -10.7  12.7  005  30 15   5.8   3.2
 21000  -9.8  14.4  360  28 14   5.9   3.3 |  -9.1  15.6  005  27 14   5.1   2.8
 20000  -8.0  17.6  355  26 13   6.0   3.3 |  -7.6  18.3  360  25 13   5.2   2.8
 19500  -7.1  19.2  350  25 13   6.1   3.3 |  -6.8  19.8  360  23 12   5.3   2.9
 19000  -6.2  20.8  350  23 12   7.0   3.8 |  -5.9  21.4  355  23 12   6.9   3.8
 18500  -5.2  22.6  345  22 11   7.1   3.9 |  -4.9  23.2  355  22 11   6.9   3.8
 18000  -4.2  24.4  340  20 11   7.0   3.8 |  -3.9  25.0  350  22 11   8.4   4.6
 17500  -3.2  26.2  345  19 10   6.9   3.8 |  -2.0  28.4  345  20 10   9.2   5.1
 17000  -1.6  29.1  345  17  9   7.9   4.3 |  -0.8  30.6  345  19 10   8.1   4.4
 16500  -0.4  31.3  350  17  9   8.2   4.5 |   0.3  32.5  345  18  9   7.7   4.2
 16000   0.8  33.4  350  17  9   8.3   4.6 |   1.4  34.5  345  16  8   7.5   4.1
 15500   2.0  35.6  350  16  8   8.6   4.7 |   2.5  36.5  350  14  7   6.8   3.7
 15000   3.3  37.9  355  15  8   8.7   4.8 |   3.5  38.3  360  11  6   6.8   3.7
 14500   4.3  39.7  360  12  6   6.7   3.7 |   4.6  40.3  005   9  5   7.6   4.2
 14000   5.3  41.5  010   9  5   7.0   3.8 |   5.7  42.3  020   6  3   7.5   4.1
 13500   6.3  43.3  025   6  3   7.4   4.0 |   6.8  44.2  045   5  2   8.1   4.5
 13000   7.3  45.1  045   4  2   7.5   4.1 |   7.9  46.2  060   4  2   8.3   4.6
 12500   8.3  46.9  070   3  2   8.8   4.8 |   9.0  48.2  080   4  2   9.0   5.0
 12000   9.6  49.3  080   3  2   9.2   5.1 |  10.4  50.7  085   4  2   9.3   5.1
 11500  11.0  51.8  085   3  2   9.5   5.2 |  11.7  53.1  090   4  2   9.3   5.1
 11000  12.3  54.1  085   3  2   9.6   5.3 |  13.0  55.4  090   3  2   9.1   5.0
 10500  13.6  56.5  090   3  1   4.5   2.5 |  14.4  57.9  085   3  2   4.1   2.2
 10250  13.9  57.0  090   3  1   7.5   4.1 |  14.5  58.1  085   3  2   6.7   3.7
 10000  14.8  58.6  085   3  1  14.0   7.7 |  15.4  59.7  080   3  1  13.9   7.6
  9750  15.8  60.4  085   3  1  12.3   6.8 |  16.3  61.3  080   3  1  12.5   6.8
  9500  16.6  61.9  085   3  1   9.2   5.1 |  17.2  63.0  080   3  1   9.7   5.3
  9250  17.2  63.0  085   3  1   7.7   4.2 |  17.8  64.0  080   2  1   7.7   4.2
  9000  17.9  64.2  085   2  1  11.0   6.0 |  18.5  65.3  075   2  1  10.6   5.8
  8750  18.8  65.8  080   2  1  11.5   6.3 |  19.3  66.7  075   2  1  11.0   6.0
  8500  19.6  67.3  080   2  1  10.4   5.7 |  20.1  68.2  070   2  1  10.1   5.5
  8250  20.3  68.5  080   2  1   9.9   5.4 |  20.8  69.4  065   2  1   9.5   5.2
  8000  21.0  69.8  080   2  1  10.0   5.5 |  21.5  70.7  065   2  1  10.0   5.5
  7750  21.8  71.2  080   2  1   9.9   5.4 |  22.3  72.1  060   2  1  10.2   5.6
  7500  22.5  72.5  075   2  1   9.9   5.4 |  23.0  73.4  055   2  1   9.7   5.3
  7250  23.3  73.9  075   2  1   9.9   5.4 |  23.8  74.8  050   2  1   9.3   5.1
  7000  24.0  75.2  075   2  1   9.8   5.4 |  24.5  76.1  045   2  1   9.9   5.4
  6750  24.8  76.6  075   2  1  10.0   5.5 |  25.2  77.4  040   2  1  10.5   5.8
  6500  25.5  77.9  075   2  1  10.4   5.7 |  26.0  78.8  035   2  1  10.4   5.7
  6250  26.3  79.3  070   2  1  10.0   5.5 |  26.8  80.2  030   2  1  10.3   5.6
  6000  27.1  80.8  070   2  1  11.5   6.3 |  27.6  81.7  025   2  1  10.3   5.6
  5750  28.1  82.6  065   1  1  17.9   9.8 |  28.3  82.9  020   1  1  13.1   7.2
  5500  29.7  85.5  060   2  1  23.9  13.1 |  29.5  85.1  020   2  1  18.0   9.9
________________________________________________________________________________

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.

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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