Soaring Guidance
Issued by NWS Denver/Boulder, CO

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000
UXUS97 KBOU 290019
SRGBOU

Soaring Forecast
National Weather Service Denver/Boulder, Colorado
1719 MST Friday, November 28, 2014

This forecast is for Saturday, November 29, 2014:

If the trigger temperature of 66.8 F/19.3 C is reached...then
   Thermal Soaring Index....................... Poor
   Maximum rate of lift........................ 100 ft/min (0.5 m/s)
   Maximum height of thermals.................. 9623 ft MSL (4336 ft AGL)

Forecast maximum temperature................... 68.0 F/20.5 C
Time of trigger temperature.................... 1315 MST
Time of overdevelopment........................ None
Middle/high clouds during soaring window....... Overcast opaque high
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 8305 ft MSL (3018 ft AGL)
Thermal soaring outlook for Sunday 11/30....... Poor

Wave Soaring Index............................. Fair
Wave Soaring Index trend (to 1700 MST)......... Increasing
Height of stable layer (12-18K ft MSL)......... None
Weak PVA/NVA (through 1700 MST)................ Weak NVA
Potential height of wave....................... 45092 ft MSL (39805 ft AGL)
Wave soaring outlook for Sunday 11/30.......... Good

Remarks... None

Sunrise/Sunset.................... 06:59:30 / 16:36:10 MST
Total possible sunshine........... 9 hr 36 min 40 sec (576 min 40 sec)
Altitude of sun at 11:47:58 MST... 28.73 degrees

Upper air data from numerical model forecast valid on 11/29/2014 at 0500 MST

Freezing level.................. 13188 ft MSL (7901 ft AGL)
Convective condensation level... 23069 ft MSL (17782 ft AGL)
Lifted condensation level....... 18445 ft MSL (13158 ft AGL)
Lifted index.................... +8.6
K index......................... -30.8

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  -71.4 -96.5   260   66   34   0.3   0.2      M     M       M      M    M
 45000  -70.9 -95.6   265   95   49   4.0   2.2      M     M       M      M    M
 40000  -61.5 -78.7   265   86   44   6.1   3.3      M     M       M      M    M
 38000  -57.1 -70.8   265   82   42   7.7   4.2      M     M       M      M    M
 36000  -52.5 -62.5   265   79   41   7.7   4.2      M     M       M      M    M
 34000  -47.8 -54.0   265   76   39   7.9   4.3      M     M       M      M    M
 32000  -43.1 -45.6   270   72   37   7.9   4.3      M     M       M      M    M
 30000  -38.3 -36.9   270   68   35   8.2   4.5   37.9 100.3    13.5      M    M
 29000  -35.9 -32.6   270   67   34   8.2   4.5   37.2  99.0    13.2      M    M
 28000  -32.8 -27.0   270   65   33   8.2   4.5   36.5  97.8    12.8      M    M
 27000  -30.4 -22.7   270   63   33   7.9   4.3   35.9  96.7    12.5      M    M
 26000  -28.0 -18.4   270   62   32   7.9   4.3   35.2  95.3    12.0      M    M
 25000  -25.7 -14.3   270   61   31   7.9   4.3   34.5  94.1    11.7      M    M
 24000  -23.3  -9.9   270   59   31   7.7   4.2   33.9  93.0    11.3      M    M
 23000  -21.0  -5.8   270   58   30   7.7   4.2   33.1  91.5    10.7      M    M
 22000  -18.7  -1.7   270   56   29   7.7   4.2   32.3  90.2    10.3      M    M
 21000  -16.4   2.5   270   54   28   7.1   3.9   31.6  88.9     9.8      M    M
 20000  -14.3   6.3   270   51   26   7.1   3.9   30.6  87.1     9.0      M    M
 19500  -13.2   8.2   270   49   25   7.1   3.9   30.2  86.3     8.7      M    M
 19000  -12.2  10.0   270   48   25   7.1   3.9   29.7  85.5     8.4      M    M
 18500  -11.1  12.0   270   46   24   7.0   3.8   29.3  84.8     8.1      M    M
 18000  -10.1  13.8   270   45   23   7.0   3.8   28.8  83.9     7.7      M    M
 17500   -9.0  15.8   270   43   22   7.0   3.8   28.4  83.0     7.3      M    M
 17000   -8.0  17.6   270   42   21   7.1   3.9   27.9  82.2     6.9      M    M
 16500   -6.9  19.6   270   40   21   7.1   3.9   27.4  81.4     6.6      M    M
 16000   -5.8  21.6   265   39   20   6.9   3.8   27.0  80.6     6.2      M    M
 15500   -4.8  23.4   265   38   19   6.8   3.8   26.5  79.7     5.8      M    M
 15000   -3.8  25.2   265   36   19   6.8   3.7   26.0  78.8     5.4      M    M
 14500   -2.3  27.9   265   33   17   6.8   3.7   25.3  77.5     4.7      M    M
 14000   -1.3  29.7   265   30   16   6.3   3.5   24.8  76.6     4.3      M    M
 13500   -0.4  31.3   260   27   14   6.2   3.4   24.2  75.5     3.8      M    M
 13000    0.5  32.9   260   24   12   6.6   3.6   23.6  74.5     3.3      M    M
 12500    1.6  34.9   265   25   13   7.1   3.9   23.1  73.7     2.8      M    M
 12000    2.6  36.7   270   27   14   7.1   3.9   22.7  72.9     2.5      M    M
 11500    3.7  38.7   270   25   13   7.1   3.9   22.3  72.1     2.1      M    M
 11000    4.7  40.5   275   22   11   6.8   3.7   21.9  71.4     1.7      M    M
 10500    5.6  42.1   280   27   14   5.8   3.2   21.3  70.4     1.1      M    M
 10250    6.1  43.0   280   30   15   6.3   3.5   21.0  69.8     0.8      M    M
 10000    6.5  43.7   280   34   18   5.6   3.1   20.7  69.3     0.6      M    M
  9750    6.9  44.4   280   37   19   4.0   2.2   20.3  68.6     0.2      M    M
  9500    7.1  44.8   280   39   20   3.6   2.0   19.9  67.8    -0.3    290  1.5
  9250    7.4  45.3   280   41   21   4.0   2.2   19.4  66.9    -0.8    274  1.4
  9000    7.7  45.9   280   43   22   3.6   2.0   19.0  66.1    -1.2    259  1.3
  8750    7.9  46.2   280   43   22   1.4   0.8   18.4  65.1    -1.8    246  1.2
  8500    7.9  46.2   280   42   22   0.4   0.2   17.7  63.8    -2.5    238  1.2
  8250    7.9  46.2   275   41   21   0.5   0.3   17.0  62.5    -3.2    230  1.2
  8000    7.9  46.2   275   39   20   1.4   0.8   16.3  61.3    -3.9    221  1.1
  7750    8.1  46.6   275   35   18   2.7   1.5   15.7  60.3    -4.5    209  1.1
  7500    8.3  46.9   275   32   16   2.6   1.4   15.2  59.3    -5.0    196  1.0
  7250    8.5  47.3   275   29   15   3.2   1.7   14.6  58.3    -5.6    183  0.9
  7000    8.8  47.8   275   26   13   5.1   2.8   14.2  57.5    -6.0    167  0.8
  6750    9.2  48.6   270   22   11   3.8   2.1   13.8  56.9    -6.4    148  0.8
  6500    9.4  48.9   270   19   10   5.5   3.0   13.4  56.1    -6.9    133  0.7
  6250    9.7  49.5   265   16    8  -4.3  -2.3   12.9  55.2    -7.4    117  0.6
  6000    8.8  47.8   255   14    7 -13.7  -7.5   11.3  52.3    -9.0    138  0.7
  5750    7.6  45.7   240   12    6 -22.4 -12.3    9.4  48.9   -11.0    165  0.8
  5500    4.7  40.5   210   11    6 -54.1 -29.7    5.8  42.5   -14.6    244  1.2

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

           11/29/2014 at 0800 MST          |       11/29/2014 at 1100 MST
                                           |
K index... -32.9  LI... +6.3               | K index... -32.6  LI... +7.0
CAPE... 0.0  CIN... M                      | CAPE... 0.0  CIN... -1.0
                                           |
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 -71.4 -96.5  265  77 40  -0.0  -0.0 | -70.5 -94.9  260  79 41  -0.8  -0.4
 45000 -71.3 -96.3  260  96 49   4.3   2.4 | -71.6 -96.9  260  99 51   3.2   1.7
 40000 -62.4 -80.3  260  83 43   5.9   3.3 | -62.9 -81.2  255  84 43   5.8   3.2
 38000 -58.1 -72.6  260  80 41   7.8   4.3 | -58.7 -73.7  255  80 41   7.6   4.2
 36000 -53.4 -64.1  260  77 40   7.8   4.3 | -54.1 -65.4  255  77 40   7.6   4.2
 34000 -48.1 -54.6  260  74 38   7.9   4.3 | -48.9 -56.0  255  73 38   8.1   4.5
 32000 -43.3 -45.9  265  70 36   7.9   4.3 | -44.0 -47.2  255  70 36   8.1   4.5
 30000 -38.4 -37.1  265  67 34   8.5   4.7 | -38.9 -38.0  255  66 34   8.7   4.8
 29000 -35.9 -32.6  265  66 34   8.5   4.7 | -36.3 -33.3  255  65 33   8.7   4.8
 28000 -33.3 -27.9  265  64 33   8.5   4.7 | -33.7 -28.7  255  63 33   8.7   4.8
 27000 -30.8 -23.4  265  63 32   7.9   4.3 | -31.1 -24.0  255  62 32   8.0   4.4
 26000 -28.4 -19.1  265  61 31   8.0   4.4 | -28.7 -19.7  255  60 31   8.0   4.4
 25000 -26.0 -14.8  265  59 30   8.0   4.4 | -26.3 -15.3  255  58 30   8.0   4.4
 24000 -23.6 -10.5  265  57 29   7.8   4.3 | -23.9 -11.0  260  56 29   7.9   4.3
 23000 -21.3  -6.3  265  55 28   7.7   4.2 | -21.5  -6.7  260  53 27   7.8   4.3
 22000 -18.9  -2.0  265  52 27   7.7   4.2 | -19.2  -2.6  260  50 26   7.8   4.3
 21000 -16.6   2.1  265  49 25   7.2   4.0 | -16.8   1.8  260  46 24   7.7   4.2
 20000 -14.5   5.9  265  47 24   7.2   3.9 | -14.5   5.9  260  43 22   7.7   4.2
 19500 -13.4   7.9  270  45 23   7.2   3.9 | -13.4   7.9  260  42 22   7.7   4.2
 19000 -12.3   9.9  270  44 23   7.1   3.9 | -12.2  10.0  260  41 21   7.7   4.2
 18500 -11.3  11.7  270  43 22   6.8   3.7 | -11.1  12.0  265  39 20   7.6   4.2
 18000 -10.3  13.5  270  42 21   6.4   3.5 | -10.0  14.0  265  39 20   7.5   4.1
 17500  -9.3  15.3  270  41 21   6.2   3.4 |  -8.8  16.2  265  39 20   7.6   4.2
 17000  -7.7  18.1  270  39 20   7.4   4.1 |  -7.2  19.0  265  38 20   7.0   3.8
 16500  -6.6  20.1  270  38 20   7.4   4.1 |  -6.2  20.8  270  38 20   7.0   3.8
 16000  -5.6  21.9  270  38 20   6.7   3.7 |  -5.2  22.6  270  38 20   6.5   3.5
 15500  -4.5  23.9  270  38 20   6.8   3.7 |  -4.2  24.4  270  37 19   6.5   3.6
 15000  -3.5  25.7  270  38 19   7.1   3.9 |  -3.2  26.2  270  36 19   6.9   3.8
 14500  -2.4  27.7  270  37 19   7.1   3.9 |  -2.1  28.2  270  36 19   6.9   3.8
 14000  -1.4  29.5  270  35 18   6.6   3.6 |  -1.1  30.0  270  36 18   6.4   3.5
 13500  -0.4  31.3  270  35 18   6.4   3.5 |  -0.2  31.6  270  36 18   5.8   3.2
 13000   0.5  32.9  270  34 18   6.8   3.8 |   0.6  33.1  270  36 19   6.1   3.3
 12500   1.6  34.9  270  37 19   7.8   4.3 |   1.6  34.9  270  43 22   6.8   3.7
 12000   2.8  37.0  275  41 21   7.3   4.0 |   2.7  36.9  270  51 26   6.3   3.5
 11500   3.7  38.7  275  41 21   5.2   2.9 |   3.3  37.9  270  50 26   3.8   2.1
 11000   4.5  40.1  275  40 20   5.4   3.0 |   3.9  39.0  270  47 24   4.2   2.3
 10500   5.3  41.5  275  41 21   5.9   3.2 |   4.7  40.5  275  48 25   6.0   3.3
 10250   5.7  42.3  280  42 22   5.5   3.0 |   5.1  41.2  275  49 25   4.9   2.7
 10000   6.1  43.0  280  42 22   5.2   2.9 |   5.4  41.7  275  47 24   3.5   1.9
  9750   6.5  43.7  280  42 22   5.9   3.3 |   5.6  42.1  275  45 23   3.9   2.1
  9500   7.0  44.6  280  42 22   6.1   3.4 |   5.9  42.6  275  43 22   4.3   2.3
  9250   7.4  45.3  280  43 22   6.5   3.6 |   6.2  43.2  275  41 21   4.4   2.4
  9000   7.9  46.2  280  43 22   4.9   2.7 |   6.5  43.7  275  39 20   3.8   2.1
  8750   8.1  46.6  280  43 22   2.8   1.6 |   6.8  44.2  275  37 19   3.3   1.8
  8500   8.3  46.9  280  42 22   2.9   1.6 |   7.0  44.6  275  34 18   3.8   2.1
  8250   8.5  47.3  280  41 21   3.3   1.8 |   7.3  45.1  275  31 16   3.2   1.7
  8000   8.7  47.7  280  40 21   1.6   0.9 |   7.5  45.5  270  28 14   5.4   3.0
  7750   8.7  47.7  280  35 18   0.6   0.3 |   8.0  46.4  270  24 12   6.4   3.5
  7500   8.8  47.8  275  32 16   1.5   0.8 |   8.4  47.1  270  21 11   5.0   2.8
  7250   8.9  48.0  275  28 15   1.6   0.9 |   8.8  47.8  265  18  9   5.4   3.0
  7000   9.1  48.4  275  25 13   3.6   2.0 |   9.2  48.6  265  16  8   5.3   2.9
  6750   9.4  48.9  275  22 11   3.1   1.7 |   9.6  49.3  260  14  7   4.8   2.6
  6500   9.6  49.3  270  19 10   5.0   2.7 |   9.9  49.8  250  11  6   5.2   2.9
  6250   9.8  49.6  265  15  8  -4.4  -2.4 |  10.3  50.5  235  10  5   2.8   1.5
  6000   8.9  48.0  255  12  6 -13.9  -7.6 |  10.3  50.5  220   9  5  -0.1  -0.1
  5750   7.7  45.9  240  10  5 -24.2 -13.3 |  10.3  50.5  205   9  4   0.1   0.1
  5500   4.7  40.5  210   9  5 -53.1 -29.1 |  10.3  50.5  190   7  4   1.4   0.8

           11/29/2014 at 1400 MST          |       11/29/2014 at 1700 MST
                                           |
K index... -24.4  LI... +8.4               | K index... -22.3  LI... +9.1
CAPE... 0.0  CIN... -1.2                   | CAPE... 0.0  CIN... -0.6
                                           |
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 -68.9 -92.0  265  71 37  -1.6  -0.9 | -68.2 -90.8  270  65 33  -1.5  -0.8
 45000 -71.2 -96.2  260  94 48   2.5   1.4 | -70.5 -94.9  260  83 43   1.6   0.9
 40000 -62.9 -81.2  250  87 45   5.6   3.0 | -62.8 -81.0  250  81 42   5.1   2.8
 38000 -58.7 -73.7  250  84 43   7.7   4.2 | -58.9 -74.0  250  81 42   7.6   4.1
 36000 -54.1 -65.4  250  82 42   7.7   4.2 | -54.3 -65.7  250  80 41   7.6   4.1
 34000 -49.4 -56.9  250  79 40   8.1   4.4 | -49.7 -57.5  250  79 41   8.2   4.5
 32000 -43.9 -47.0  250  74 38   8.1   4.5 | -44.1 -47.4  250  77 40   8.2   4.5
 30000 -38.8 -37.8  255  71 37   8.9   4.9 | -39.1 -38.4  255  75 39   8.5   4.6
 29000 -36.2 -33.2  255  70 36   8.9   4.9 | -36.6 -33.9  255  73 38   8.5   4.6
 28000 -33.5 -28.3  255  69 36   8.9   4.9 | -34.0 -29.2  255  72 37   8.5   4.6
 27000 -30.9 -23.6  255  68 35   8.0   4.4 | -31.5 -24.7  255  71 36   8.7   4.8
 26000 -28.5 -19.3  255  68 35   8.0   4.4 | -28.8 -19.8  255  70 36   8.8   4.8
 25000 -26.1 -15.0  255  67 35   8.0   4.4 | -26.2 -15.2  255  69 35   8.8   4.8
 24000 -23.7 -10.7  255  66 34   7.8   4.3 | -23.6 -10.5  255  68 35   8.2   4.5
 23000 -21.4  -6.5  255  64 33   7.6   4.2 | -21.3  -6.3  255  67 35   7.4   4.1
 22000 -19.1  -2.4  260  61 32   7.6   4.2 | -19.1  -2.4  260  67 34   7.4   4.1
 21000 -16.8   1.8  260  59 30   7.0   3.8 | -16.9   1.6  260  66 34   6.7   3.7
 20000 -14.8   5.4  260  55 28   6.8   3.7 | -15.0   5.0  260  63 33   6.3   3.5
 19500 -13.7   7.3  260  53 28   6.8   3.7 | -14.0   6.8  260  62 32   6.3   3.5
 19000 -12.7   9.1  260  52 27   6.8   3.7 | -13.1   8.4  260  60 31   6.3   3.5
 18500 -11.7  10.9  260  50 26   6.6   3.6 | -12.1  10.2  265  59 30   6.1   3.4
 18000 -10.8  12.6  260  48 25   6.1   3.3 | -11.3  11.7  265  58 30   5.5   3.0
 17500  -9.9  14.2  265  47 24   6.1   3.3 | -10.4  13.3  265  57 29   5.5   3.0
 17000  -8.9  16.0  265  45 23   6.3   3.4 |  -9.6  14.7  265  56 29   5.4   3.0
 16500  -8.0  17.6  265  45 23   6.3   3.4 |  -8.8  16.2  265  54 28   5.4   3.0
 16000  -6.6  20.1  265  44 23   5.8   3.2 |  -7.6  18.3  265  52 27   4.8   2.6
 15500  -5.7  21.7  265  43 22   5.8   3.2 |  -6.9  19.6  265  51 26   4.8   2.6
 15000  -4.9  23.2  270  42 21   6.1   3.4 |  -6.2  20.8  270  49 25   4.8   2.6
 14500  -3.9  25.0  270  42 22   6.2   3.4 |  -5.5  22.1  270  49 25   4.8   2.6
 14000  -3.0  26.6  270  42 22   6.0   3.3 |  -4.7  23.5  270  49 25   4.9   2.7
 13500  -2.1  28.2  270  41 21   5.6   3.1 |  -4.0  24.8  270  45 23   4.9   2.7
 13000  -1.3  29.7  270  40 21   5.7   3.1 |  -3.3  26.1  270  40 20   5.4   3.0
 12500  -0.5  31.1  270  44 23   5.9   3.2 |  -2.3  27.9  270  39 20   7.5   4.1
 12000   0.4  32.7  270  50 26   5.8   3.2 |  -1.2  29.8  270  40 21   7.2   4.0
 11500   1.2  34.2  270  47 24   4.8   2.6 |  -0.3  31.5  270  37 19   4.8   2.7
 11000   1.9  35.4  270  40 21   4.9   2.7 |   0.4  32.7  270  33 17   5.1   2.8
 10500   2.6  36.7  270  36 19   5.5   3.0 |   1.2  34.2  270  31 16   5.9   3.3
 10250   3.0  37.4  270  35 18   5.3   2.9 |   1.6  34.9  270  31 16   5.4   3.0
 10000   3.4  38.1  270  33 17   5.5   3.0 |   2.0  35.6  265  28 15   5.4   3.0
  9750   3.8  38.8  265  30 16   6.2   3.4 |   2.4  36.3  265  25 13   7.2   3.9
  9500   4.3  39.7  265  28 14   6.6   3.6 |   3.0  37.4  260  23 12   8.0   4.4
  9250   4.8  40.6  265  25 13   6.4   3.5 |   3.6  38.5  260  21 11   8.1   4.4
  9000   5.2  41.4  260  23 12   6.1   3.4 |   4.1  39.4  260  18  9   5.9   3.2
  8750   5.7  42.3  260  21 11   7.3   4.0 |   4.5  40.1  255  17  9   7.0   3.9
  8500   6.3  43.3  255  19 10   8.4   4.6 |   5.2  41.4  250  15  8  10.1   5.5
  8250   6.9  44.4  255  17  9   7.8   4.3 |   5.9  42.6  250  13  7   8.6   4.7
  8000   7.4  45.3  250  15  8   9.0   4.9 |   6.6  43.9  245  12  6  11.5   6.3
  7750   8.2  46.8  245  14  7   8.9   4.9 |   7.5  45.5  240  11  6  11.0   6.0
  7500   8.7  47.7  240  13  7   7.6   4.2 |   8.1  46.6  240  11  5   7.9   4.3
  7250   9.3  48.7  235  12  6   8.1   4.5 |   8.8  47.8  240  10  5   8.9   4.9
  7000  10.0  50.0  230  11  6   8.7   4.8 |   9.4  48.9  235  10  5   9.7   5.3
  6750  10.6  51.1  225  10  5   8.5   4.7 |  10.2  50.4  235  10  5  10.0   5.5
  6500  11.2  52.2  215  10  5   7.9   4.3 |  10.9  51.6  235   9  5  10.1   5.5
  6250  11.8  53.2  205   9  5   8.5   4.6 |  11.7  53.1  235   9  5   9.0   4.9
  6000  12.4  54.3  200   8  4   9.0   4.9 |  12.2  54.0  230   8  4   7.6   4.2
  5750  13.1  55.6  195   7  4   9.4   5.2 |  12.7  54.9  225   8  4   2.9   1.6
  5500  13.8  56.8  190   6  3  10.6   5.8 |  12.3  54.1  215   6  3 -10.1  -5.5
________________________________________________________________________________

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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