Soaring Guidance
Issued by NWS Pueblo, CO

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13
000
UXUS97 KPUB 051044
SRGPUB

Soaring Forecast
National Weather Service Pueblo, Colorado
0444 MDT Saturday, July 5, 2014

This forecast is for Saturday, July 5, 2014:

If the trigger temperature of 75.8 F/24.3 C is reached...then
   Thermal Soaring Index....................... Excellent
   Maximum rate of lift........................ 1319 ft/min (6.7 m/s)
   Maximum height of thermals.................. 20448 ft MSL (13690 ft AGL)

Forecast maximum temperature................... 86.0 F/30.5 C
Time of trigger temperature.................... 0830 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................. 16039 ft MSL (9281 ft AGL)
Thermal soaring outlook for Sunday 07/06....... 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 PVA
Potential height of wave....................... 26739 ft MSL (19981 ft AGL)
Wave soaring outlook for Sunday 07/06.......... Poor

Remarks...

Sunrise/Sunset.................... 05:39:28 / 20:27:47 MDT
Total possible sunshine........... 14 hr 48 min 19 sec (888 min 19 sec)
Altitude of sun at 13:03:38 MDT... 73.75 degrees

Upper air data from numerical model forecast valid on 07/05/2014 at 0600 MDT

Freezing level.................. 16141 ft MSL (9383 ft AGL)
Convective condensation level... 16802 ft MSL (10044 ft AGL)
Lifted condensation level....... 17567 ft MSL (10809 ft AGL)
Lifted index.................... -3.6
K index......................... +21.6

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  -64.8 -84.6   290   36   19   1.1   0.6      M     M       M      M    M
 45000  -61.5 -78.7   295   51   26   4.6   2.5      M     M       M      M    M
 40000  -54.1 -65.4   295   50   26   7.3   4.0      M     M       M      M    M
 38000  -49.6 -57.3   290   47   24   7.4   4.0      M     M       M      M    M
 36000  -45.2 -49.4   290   44   23   7.3   4.0      M     M       M      M    M
 34000  -39.8 -39.6   295   38   19   8.1   4.5      M     M       M      M    M
 32000  -34.9 -30.8   300   32   17   8.6   4.7      M     M       M      M    M
 30000  -29.9 -21.8   300   26   13   8.2   4.5   39.8 103.7     7.6      M    M
 29000  -27.5 -17.5   300   23   12   8.2   4.5   39.3 102.8     7.3      M    M
 28000  -25.1 -13.2   300   20   10   6.6   3.6   38.7 101.7     6.9      M    M
 27000  -23.1  -9.6   300   18    9   6.7   3.7   37.4  99.4     5.9      M    M
 26000  -21.1  -6.0   310   16    8   6.7   3.7   36.3  97.4     5.1      M    M
 25000  -19.1  -2.4   315   14    7   6.7   3.7   35.3  95.6     4.3      M    M
 24000  -17.1   1.2   320   13    7   6.7   3.7   34.1  93.4     3.3      M    M
 23000  -15.1   4.8   320   12    6   6.8   3.7   33.0  91.5     2.4      M    M
 22000  -13.2   8.2   325   11    6   6.9   3.8   32.1  89.8     1.5      M    M
 21000  -11.1  12.0   325   10    5   7.0   3.8   31.0  87.8     0.6      M    M
 20000   -9.1  15.6   330    9    5   7.0   3.8   30.1  86.1    -0.3   1285  6.5
 19500   -8.1  17.4   330    9    5   7.1   3.9   29.7  85.4    -0.7   1240  6.3
 19000   -7.0  19.4   335    9    4   8.0   4.4   29.3  84.7    -1.1   1191  6.1
 18500   -5.8  21.6   340    9    4   7.9   4.3   29.0  84.2    -1.4   1141  5.8
 18000   -4.6  23.7   345    8    4   7.9   4.3   28.7  83.6    -1.7   1091  5.5
 17500   -3.5  25.7   350    8    4   7.9   4.3   28.3  83.0    -2.0   1042  5.3
 17000   -2.3  27.9   360    8    4   7.9   4.3   28.0  82.5    -2.3    993  5.0
 16500   -0.6  30.9   360    8    4   8.0   4.4   27.6  81.7    -2.8    918  4.7
 16000    0.6  33.1   005    8    4   8.0   4.4   27.3  81.2    -3.1    868  4.4
 15500    1.8  35.2   355    8    4   8.0   4.4   27.0  80.7    -3.4    817  4.2
 15000    3.0  37.4   350    9    4   8.0   4.4   26.8  80.2    -3.7    767  3.9
 14500    4.2  39.6   340    9    4   8.3   4.5   26.5  79.7    -3.9    716  3.6
 14000    5.4  41.7   335    8    4   8.2   4.5   26.2  79.2    -4.2    664  3.4
 13500    6.7  44.1   330    8    4   8.8   4.8   26.0  78.9    -4.4    612  3.1
 13000    8.0  46.4   325    8    4   8.9   4.9   25.9  78.6    -4.6    557  2.8
 12500    9.3  48.7   320    8    4   8.7   4.8   25.8  78.4    -4.8    504  2.6
 12000   10.6  51.1   320    8    4   8.9   4.9   25.6  78.1    -5.0    450  2.3
 11750   11.2  52.2   320    8    4   8.8   4.8   25.5  77.9    -5.1    423  2.1
 11500   11.9  53.4   320    8    4   9.2   5.1   25.5  77.8    -5.2    396  2.0
 11250   12.6  54.7   320    8    4   9.0   4.9   25.4  77.8    -5.2    369  1.9
 11000   13.2  55.8   315    9    4   8.3   4.6   25.3  77.6    -5.4    343  1.7
 10750   13.8  56.8   315    9    5   8.5   4.7   25.2  77.4    -5.5    317  1.6
 10500   14.4  57.9   310    9    5   8.3   4.6   25.1  77.2    -5.7    292  1.5
 10250   15.0  59.0   310    9    4   8.2   4.5   25.0  77.0    -5.8    267  1.4
 10000   15.5  59.9   310    8    4   8.1   4.4   24.9  76.8    -6.0    243  1.2
  9750   16.1  61.0   305    7    4   7.9   4.3   24.8  76.6    -6.2    218  1.1
  9500   16.7  62.1   305    7    3   8.3   4.6   24.6  76.3    -6.3    193  1.0
  9250   17.3  63.1   305    6    3   8.6   4.7   24.5  76.2    -6.4    166  0.8
  9000   18.0  64.4   305    6    3   8.5   4.7   24.4  76.0    -6.5    140  0.7
  8750   18.6  65.5   300    6    3   7.7   4.2   24.3  75.8    -6.7    114  0.6
  8500   19.0  66.2   300    8    4   3.9   2.1   24.1  75.3    -7.0     93  0.5
  8250   19.1  66.4   300    8    4  -0.1  -0.1   23.4  74.2    -7.7     84  0.4
  8000   19.2  66.6   300    9    5   5.8   3.2   22.8  73.1    -8.3     74  0.4
  7750   19.3  66.7   300   10    5 -13.8  -7.6   22.2  72.0    -9.0     64  0.3
  7500   17.1  62.8   295   10    5 -26.9 -14.7   19.6  67.3   -11.8    123  0.6
  7250   15.7  60.3   295    9    5 -14.1  -7.7   17.9  64.1   -13.5    157  0.8
  7000   14.3  57.7   290    8    4 -25.4 -13.9   16.1  61.0   -15.3    191  1.0
  6750      M     M     M    M    M     M     M      M     M       M      M    M

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

           07/05/2014 at 0900 MDT          |       07/05/2014 at 1200 MDT
                                           |
K index... +17.9  LI... -1.4               | K index... +22.5  LI... -1.1
CAPE... +97.4  CIN... -58.5                | CAPE... +104.4  CIN... -11.3
                                           |
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 -64.0 -83.2  295  34 18   0.8   0.4 | -64.4 -83.9  295  32 16   0.8   0.4
 45000 -61.3 -78.3  295  49 25   4.3   2.3 | -61.5 -78.7  290  46 24   4.6   2.5
 40000 -53.8 -64.8  290  47 24   7.4   4.1 | -53.6 -64.5  290  47 24   7.2   4.0
 38000 -49.4 -56.9  290  44 23   7.4   4.1 | -49.3 -56.7  290  43 22   7.2   4.0
 36000 -45.0 -49.0  290  42 22   7.5   4.1 | -44.9 -48.8  285  39 20   7.5   4.1
 34000 -40.3 -40.5  290  36 18   7.8   4.3 | -40.1 -40.2  285  33 17   8.0   4.4
 32000 -35.6 -32.1  290  29 15   8.4   4.6 | -35.3 -31.5  285  28 14   8.6   4.7
 30000 -30.8 -23.4  290  23 12   8.1   4.5 | -31.1 -24.0  295  24 12   7.0   3.8
 29000 -28.3 -18.9  290  20 11   8.1   4.5 | -29.1 -20.4  300  23 12   6.9   3.8
 28000 -25.9 -14.6  290  18  9   7.4   4.1 | -26.9 -16.4  305  22 11   8.2   4.5
 27000 -23.3  -9.9  295  16  8   7.2   3.9 | -24.4 -11.9  305  20 10   8.4   4.6
 26000 -21.1  -6.0  300  14  7   7.2   3.9 | -21.9  -7.4  310  18  9   8.4   4.6
 25000 -19.0  -2.2  305  13  7   6.8   3.7 | -18.8  -1.8  310  16  8   7.1   3.9
 24000 -17.0   1.4  305  11  6   6.7   3.7 | -16.7   1.9  310  15  8   6.9   3.8
 23000 -15.1   4.8  305  10  5   6.7   3.7 | -14.7   5.5  305  14  7   7.0   3.8
 22000 -13.1   8.4  305   8  4   6.5   3.6 | -12.7   9.1  305  13  7   6.4   3.5
 21000 -11.3  11.7  315   8  4   6.4   3.5 | -10.8  12.6  305  12  6   6.5   3.5
 20000  -9.4  15.1  330   7  4   6.5   3.6 |  -8.9  16.0  310  11  6   6.5   3.6
 19500  -8.5  16.7  340   7  4   6.8   3.8 |  -8.0  17.6  310  11  6   6.8   3.8
 19000  -7.4  18.7  350   8  4   7.8   4.3 |  -6.9  19.6  320  11  6   7.2   3.9
 18500  -6.2  20.8  355   9  5   7.7   4.2 |  -5.9  21.4  325  11  6   7.2   3.9
 18000  -5.0  23.0  360  11  5   8.3   4.6 |  -4.8  23.4  335  11  6   7.7   4.3
 17500  -3.8  25.2  005  12  6   8.4   4.6 |  -3.7  25.3  340  12  6   7.7   4.2
 17000  -2.5  27.5  005  13  7   8.5   4.6 |  -2.5  27.5  350  13  7   7.9   4.3
 16500  -1.3  29.7  005  13  7   8.6   4.7 |  -1.4  29.5  355  13  7   8.1   4.4
 16000  -0.0  32.0  005  14  7   8.6   4.7 |  -0.2  31.6  360  14  7   8.1   4.5
 15500   1.3  34.3  010  14  7   8.9   4.9 |   1.1  34.0  005  13  7   9.2   5.1
 15000   2.6  36.7  010  15  8   8.9   4.9 |   2.5  36.5  010  13  7   9.2   5.0
 14500   3.9  39.0  010  15  8   8.9   4.9 |   3.8  38.8  015  13  7   9.0   4.9
 14000   5.8  42.4  010  15  8   8.9   4.9 |   5.1  41.2  015  13  7   9.0   4.9
 13500   7.1  44.8  010  15  8   8.6   4.7 |   6.4  43.5  020  12  6   8.8   4.8
 13000   8.4  47.1  010  14  7   8.8   4.8 |   7.7  45.9  020  12  6   8.7   4.8
 12500   9.5  49.1  010  14  7   7.5   4.1 |   8.9  48.0  020  12  6   7.9   4.4
 12000  10.7  51.3  005  13  7   8.0   4.4 |  10.2  50.4  020  11  6  10.3   5.6
 11750  11.3  52.3  005  13  7   8.1   4.5 |  10.9  51.6  020  11  6   9.8   5.4
 11500  11.9  53.4  005  12  6   9.0   4.9 |  11.7  53.1  020  11  6  10.2   5.6
 11250  12.6  54.7  005  12  6   8.5   4.7 |  12.4  54.3  020  11  6  10.5   5.8
 11000  13.2  55.8  005  12  6   7.6   4.1 |  13.2  55.8  020  11  6  10.0   5.5
 10750  13.8  56.8  005  12  6   7.9   4.3 |  13.9  57.0  020  11  6   9.5   5.2
 10500  14.4  57.9  360  11  6   8.9   4.9 |  14.6  58.3  020  11  6  10.1   5.5
 10250  15.1  59.2  360  11  6   9.7   5.3 |  15.4  59.7  020  11  6  11.1   6.1
 10000  15.7  60.3  355  11  5   8.3   4.6 |  17.0  62.6  020  11  6   8.6   4.7
  9750  16.3  61.3  355  10  5   7.7   4.2 |  17.6  63.7  020  11  6   8.9   4.9
  9500  16.9  62.4  350  10  5   9.0   5.0 |  18.3  64.9  020  11  5  10.5   5.8
  9250  17.6  63.7  350  10  5   9.8   5.4 |  19.1  66.4  020  11  5  10.8   5.9
  9000  18.3  64.9  350   9  5   9.1   5.0 |  19.9  67.8  020  10  5  10.1   5.6
  8750  18.9  66.0  345   9  5   8.2   4.5 |  20.6  69.1  015  10  5   9.9   5.5
  8500  19.4  66.9  345   9  5   9.0   4.9 |  21.4  70.5  015  10  5  10.5   5.8
  8250  20.1  68.2  340   9  5   9.8   5.3 |  22.2  72.0  020  10  5  10.7   5.9
  8000  20.8  69.4  340   9  5   9.4   5.2 |  23.0  73.4  020  10  5  10.0   5.5
  7750  21.4  70.5  335   9  5  10.2   5.6 |  23.9  75.0  015  10  5  16.0   8.8
  7500  22.2  72.0  340   8  4   9.4   5.1 |  25.5  77.9  020  10  5  28.0  15.3
  7250  22.7  72.9  335   8  4   7.7   4.2 |  27.1  80.8  020   9  5   6.4   3.5
  7000  23.3  73.9  335   7  4   9.1   5.0 |     M     M    M   M  M     M     M
  6750     M     M    M   M  M     M     M |     M     M    M   M  M     M     M

           07/05/2014 at 1500 MDT          |       07/05/2014 at 1800 MDT
                                           |
K index... +25.3  LI... -1.4               | K index... +28.2  LI... -1.6
CAPE... +151.7  CIN... -6.1                | CAPE... +140.3  CIN... -3.3
                                           |
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 -64.8 -84.6  300  33 17   1.4   0.8 | -65.2 -85.4  300  30 15   1.7   0.9
 45000 -61.3 -78.3  295  47 24   4.3   2.4 | -61.7 -79.1  300  40 21   4.0   2.2
 40000 -53.8 -64.8  290  48 25   7.4   4.1 | -54.4 -65.9  300  36 19   8.2   4.5
 38000 -49.3 -56.7  285  47 24   7.4   4.1 | -49.5 -57.1  295  38 20   8.2   4.5
 36000 -44.9 -48.8  285  46 24   7.6   4.2 | -44.6 -48.3  295  41 21   8.2   4.5
 34000 -40.0 -40.0  285  40 21   8.1   4.4 | -39.7 -39.5  295  36 19   8.1   4.4
 32000 -35.2 -31.4  285  35 18   8.7   4.8 | -34.9 -30.8  300  32 17   8.5   4.6
 30000 -30.7 -23.3  290  28 14   7.5   4.1 | -30.4 -22.7  305  27 14   7.5   4.1
 29000 -27.9 -18.2  295  23 12   7.5   4.1 | -28.2 -18.8  310  24 12   7.5   4.1
 28000 -25.6 -14.1  300  20 10   7.4   4.0 | -25.4 -13.7  315  22 11   7.2   3.9
 27000 -23.4 -10.1  305  19 10   7.4   4.1 | -23.3  -9.9  320  21 11   7.2   3.9
 26000 -21.2  -6.2  310  17  9   7.4   4.1 | -21.1  -6.0  325  20 10   7.2   4.0
 25000 -19.0  -2.2  315  16  8   6.9   3.8 | -19.0  -2.2  330  19 10   6.8   3.8
 24000 -17.0   1.4  320  15  8   6.8   3.7 | -17.0   1.4  330  19 10   6.7   3.7
 23000 -15.0   5.0  320  15  8   6.8   3.7 | -15.0   5.0  335  19 10   6.8   3.7
 22000 -13.0   8.6  325  15  8   6.7   3.7 | -13.1   8.4  335  18  9   6.6   3.6
 21000 -11.0  12.2  325  15  8   6.7   3.7 | -11.1  12.0  345  17  9   6.6   3.6
 20000  -9.1  15.6  330  15  8   6.8   3.7 |  -9.2  15.4  355  16  8   6.6   3.6
 19500  -8.1  17.4  330  16  8   7.1   3.9 |  -8.2  17.2  360  15  8   6.8   3.7
 19000  -7.0  19.4  335  15  8   7.9   4.4 |  -7.2  19.0  005  13  7   7.2   4.0
 18500  -5.8  21.6  335  14  7   8.0   4.4 |  -6.2  20.8  015  11  6   7.1   3.9
 18000  -4.7  23.5  340  13  7   7.9   4.3 |  -5.1  22.8  020  10  5   8.3   4.5
 17500  -3.5  25.7  350  12  6   7.9   4.3 |  -3.9  25.0  030   9  5   8.4   4.6
 17000  -2.4  27.7  360  11  6   8.0   4.4 |  -2.7  27.1  035   8  4   8.8   4.8
 16500  -1.3  29.7  010  10  5   8.2   4.5 |  -1.4  29.5  040   8  4   9.5   5.2
 16000  -0.1  31.8  025   9  5   8.1   4.5 |   0.0  32.0  040   8  4   9.4   5.2
 15500   1.1  34.0  035   9  5   9.7   5.3 |   1.4  34.5  040   8  4  10.1   5.5
 15000   2.5  36.5  035   9  5   9.5   5.2 |   2.9  37.2  040   8  4  10.0   5.5
 14500   4.6  40.3  035   9  5   9.8   5.4 |   4.4  39.9  040   7  4   9.8   5.4
 14000   6.1  43.0  035   9  5   9.8   5.4 |   6.6  43.9  040   7  4   9.8   5.4
 13500   7.6  45.7  040   9  5   9.9   5.4 |   8.0  46.4  040   7  4   9.8   5.4
 13000   9.1  48.4  040   9  4  10.2   5.6 |   9.5  49.1  040   7  4   9.9   5.5
 12500  10.4  50.7  040   9  4   9.0   4.9 |  10.9  51.6  040   7  4   9.3   5.1
 12000  11.9  53.4  040   9  4  10.1   5.5 |  12.4  54.3  040   7  3  10.0   5.5
 11750  12.7  54.9  040   9  4  10.2   5.6 |  13.1  55.6  040   7  3  10.2   5.6
 11500  13.5  56.3  040   8  4  10.5   5.8 |  13.9  57.0  040   7  3  10.7   5.9
 11250  14.2  57.6  040   8  4  10.0   5.5 |  14.7  58.5  040   7  3  10.0   5.5
 11000  14.9  58.8  040   8  4   9.3   5.1 |  15.4  59.7  040   7  3   9.2   5.0
 10750  15.6  60.1  040   8  4   9.6   5.3 |  16.1  61.0  040   6  3   9.5   5.2
 10500  16.4  61.5  040   8  4  10.6   5.8 |  16.8  62.2  040   6  3  10.4   5.7
 10250  17.2  63.0  040   8  4  11.1   6.1 |  17.6  63.7  040   6  3  10.8   5.9
 10000  18.0  64.4  040   8  4   9.5   5.2 |  18.4  65.1  040   6  3   9.4   5.2
  9750  18.6  65.5  040   8  4   8.7   4.8 |  19.0  66.2  040   6  3   8.8   4.9
  9500  19.3  66.7  040   8  4   9.9   5.4 |  19.7  67.5  040   6  3  10.0   5.5
  9250  20.1  68.2  040   8  4  10.5   5.8 |  20.5  68.9  040   6  3  10.7   5.9
  9000  20.9  69.6  040   8  4  10.0   5.5 |  21.3  70.3  040   6  3   9.8   5.4
  8750  21.6  70.9  040   8  4   9.6   5.3 |  22.0  71.6  040   6  3   8.7   4.8
  8500  22.3  72.1  040   8  4  10.4   5.7 |  22.7  72.9  040   6  3   9.6   5.3
  8250  23.1  73.6  040   8  4  11.0   6.0 |  23.4  74.1  040   6  3  10.3   5.6
  8000  23.9  75.0  040   8  4  10.5   5.8 |  24.2  75.6  040   5  3  10.4   5.7
  7750  24.7  76.5  040   8  4  11.8   6.5 |  24.9  76.8  040   5  3   9.3   5.1
  7500  25.7  78.3  040   8  4  12.6   6.9 |  25.5  77.9  040   5  3   7.1   3.9
  7250  26.5  79.7  040   8  4  11.8   6.4 |  25.9  78.6  040   5  3   6.6   3.6
  7000  27.4  81.3  040   8  4  12.5   6.9 |  26.4  79.5  040   5  3   6.9   3.8
  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


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.