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
000
UXUS97 KPUB 021312
SRGPUB

Soaring Forecast
National Weather Service Pueblo, Colorado
0712 MDT Monday, May 2, 2016

This forecast is for Monday, May 2, 2016:

If the trigger temperature of 42.3 F/5.7 C is reached...then
   Thermal Soaring Index....................... Good
   Maximum rate of lift........................ 494 ft/min (2.5 m/s)
   Maximum height of thermals.................. 12957 ft MSL (6199 ft AGL)

Forecast maximum temperature................... 48.0 F/9.3 C
Time of trigger temperature.................... 1115 MDT
Time of overdevelopment........................ None
Middle/high clouds during soaring window....... None
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 10781 ft MSL (4024 ft AGL)
Thermal soaring outlook for Tuesday 05/03...... Good

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

Remarks...

Sunrise/Sunset.................... 05:59:22 / 19:52:17 MDT
Total possible sunshine........... 13 hr 52 min 55 sec (832 min 55 sec)
Altitude of sun at 12:55:59 MDT... 66.72 degrees

Upper air data from numerical model forecast valid on 05/02/2016 at 0600 MDT

Freezing level.................. Entire airmass below 32 F / 0 C
Convective condensation level... 13274 ft MSL (6516 ft AGL)
Lifted condensation level....... 12807 ft MSL (6049 ft AGL)
Lifted index.................... +2.4
K index......................... +13.2

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  -56.3 -69.3   275   22   11   1.1   0.6      M     M       M      M    M
 45000  -54.7 -66.5   275   22   11   0.9   0.5      M     M       M      M    M
 40000  -53.8 -64.8   285   26   13   0.6   0.3      M     M       M      M    M
 38000  -54.0 -65.2   290   23   12  -1.8  -1.0      M     M       M      M    M
 36000  -55.1 -67.2   310   16    8  -1.8  -1.0      M     M       M      M    M
 34000  -55.9 -68.6   345   13    7   4.9   2.7      M     M       M      M    M
 32000  -50.9 -59.6   350   15    7   7.4   4.1      M     M       M      M    M
 30000  -46.4 -51.5   350   16    8   7.5   4.1   23.5  74.3    11.2      M    M
 29000  -44.2 -47.6   340   17    9   7.6   4.1   22.6  72.6    10.6      M    M
 28000  -41.9 -43.4   335   18    9   7.6   4.1   21.7  71.1    10.1      M    M
 27000  -39.6 -39.3   335   19   10   7.7   4.2   21.1  69.9     9.6      M    M
 26000  -37.3 -35.1   335   18    9   7.9   4.3   20.2  68.4     9.1      M    M
 25000  -34.9 -30.8   335   17    9   7.9   4.3   19.5  67.1     8.6      M    M
 24000  -32.6 -26.7   335   15    8   7.8   4.3   18.9  66.1     8.2      M    M
 23000  -30.4 -22.7   335   14    7   7.4   4.1   18.0  64.4     7.6      M    M
 22000  -28.1 -18.6   335   14    7   7.4   4.1   17.2  62.9     6.9      M    M
 21000  -25.9 -14.6   330   13    7   8.0   4.4   16.4  61.6     6.4      M    M
 20000  -23.5 -10.3   325   14    7   8.2   4.5   15.8  60.5     5.9      M    M
 19500  -22.2  -8.0   325   14    7   8.2   4.5   15.6  60.0     5.7      M    M
 19000  -21.0  -5.8   320   14    7   8.2   4.5   15.3  59.6     5.5      M    M
 18500  -19.8  -3.6   320   15    8   7.9   4.3   15.1  59.2     5.4      M    M
 18000  -18.7  -1.7   320   15    8   7.6   4.2   14.7  58.5     5.0      M    M
 17500  -17.5   0.5   320   15    8   7.6   4.2   14.4  57.8     4.7      M    M
 17000  -16.5   2.3   320   15    8   7.1   3.9   13.9  57.1     4.4      M    M
 16500  -15.4   4.3   320   15    8   7.2   4.0   13.5  56.3     4.0      M    M
 16000  -13.9   7.0   320   14    7   6.4   3.5   12.8  55.0     3.3      M    M
 15500  -13.0   8.6   320   14    7   6.4   3.5   12.2  54.0     2.8      M    M
 15000  -12.1  10.2   325   13    7   6.0   3.3   11.6  52.9     2.2      M    M
 14500  -11.2  11.8   325   13    6   6.1   3.3   11.0  51.9     1.7      M    M
 14000  -10.3  13.5   325   12    6   6.0   3.3   10.4  50.8     1.1      M    M
 13500   -9.4  15.1   325   12    6   6.0   3.3    9.8  49.7     0.5      M    M
 13000   -8.5  16.7   325   12    6   6.0   3.3    9.2  48.6    -0.0    491  2.5
 12500   -7.6  18.3   320   11    6   6.0   3.3    8.6  47.5    -0.6    449  2.3
 12000   -6.7  19.9   320   10    5   6.3   3.4    8.1  46.5    -1.2    407  2.1
 11750   -6.3  20.7   320   10    5   5.9   3.2    7.8  46.0    -1.5    386  2.0
 11500   -5.8  21.6   320   10    5   6.5   3.6    7.5  45.5    -1.8    366  1.9
 11250   -5.4  22.3   320   10    5   4.5   2.5    7.2  45.0    -2.1    345  1.8
 11000   -5.2  22.6   315   10    5   1.8   1.0    6.7  44.0    -2.6    332  1.7
 10750   -5.1  22.8   310   10    5   2.3   1.3    6.0  42.9    -3.2    320  1.6
 10500   -4.9  23.2   310   10    5   3.1   1.7    5.5  41.9    -3.7    307  1.6
 10250   -4.7  23.5   305    9    5   1.5   0.8    5.0  40.9    -4.3    294  1.5
 10000   -4.7  23.5   305    9    4  -0.9  -0.5    4.2  39.6    -5.0    287  1.5
  9750   -4.7  23.5   305    7    4  -0.6  -0.4    3.4  38.1    -5.9    281  1.4
  9500   -4.8  23.4   300    6    3  -1.1  -0.6    2.6  36.6    -6.7    275  1.4
  9250   -4.8  23.4   300    5    3   2.1   1.2    1.8  35.2    -7.4    269  1.4
  9000   -4.5  23.9   300    4    2   5.3   2.9    1.4  34.5    -7.9    251  1.3
  8750   -4.2  24.4   305    3    2   4.3   2.4    1.0  33.8    -8.3    234  1.2
  8500   -3.8  25.2   315    2    1   5.1   2.8    0.6  33.1    -8.7    216  1.1
  8250   -3.4  25.9   325    1    1   6.7   3.7    0.3  32.6    -9.0    196  1.0
  8000   -2.9  26.8   315    1    1   6.6   3.6    0.1  32.2    -9.3    174  0.9
  7750   -2.4  27.7   300    1    0   8.8   4.8   -0.1  31.8    -9.5    151  0.8
  7500   -1.8  28.8   300    1    1   3.8   2.1   -0.2  31.6    -9.7    126  0.6
  7250   -1.9  28.6   280    2    1  -3.5  -1.9   -0.6  30.9   -10.1    122  0.6
  7000   -2.0  28.4   275    2    1   2.3   1.2   -1.1  30.1   -10.6    118  0.6
  6750      M     M     M    M    M     M     M      M     M       M      M    M

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

           05/02/2016 at 0900 MDT          |       05/02/2016 at 1200 MDT
                                           |
K index... +5.9  LI... +275.9              | K index... -14.5  LI... +275.1
CAPE... 0.0  CIN... -0.0                   | CAPE... 0.0  CIN... -1.4
                                           |
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 -56.6 -69.9  280  25 13   0.5   0.3 | -56.9 -70.4  285  25 13   0.7   0.4
 45000 -55.8 -68.4  270  29 15   0.7   0.4 | -55.8 -68.4  285  32 17   0.7   0.4
 40000 -54.3 -65.7  295  23 12   1.0   0.6 | -54.7 -66.5  290  23 12   0.7   0.4
 38000 -54.2 -65.6  305  21 11  -1.0  -0.6 | -54.7 -66.5  295  20 10  -0.7  -0.4
 36000 -54.8 -66.6  310  18  9  -1.0  -0.6 | -55.1 -67.2  305  16  8  -0.7  -0.4
 34000 -54.6 -66.3  320  14  7   7.2   3.9 | -54.8 -66.6  320  13  7   7.9   4.3
 32000 -50.4 -58.7  335  11  6   6.9   3.8 | -50.5 -58.9  345  10  5   7.2   3.9
 30000 -46.1 -51.0  355  10  5   7.8   4.3 | -46.1 -51.0  015   9  5   8.0   4.4
 29000 -43.8 -46.8  360  12  6   7.8   4.3 | -43.7 -46.7  015  10  5   8.0   4.4
 28000 -41.5 -42.7  360  13  7   7.8   4.3 | -40.7 -41.3  020  10  5   8.0   4.4
 27000 -39.1 -38.4  005  14  7   7.7   4.2 | -38.3 -36.9  020  10  5   7.9   4.3
 26000 -36.8 -34.2  360  15  8   7.7   4.2 | -35.9 -32.6  015  10  5   7.9   4.3
 25000 -34.5 -30.1  355  15  8   7.7   4.2 | -33.6 -28.5  010  11  5   7.9   4.3
 24000 -32.2 -26.0  355  16  8   7.8   4.3 | -31.2 -24.2  005  11  6   7.8   4.3
 23000 -29.8 -21.6  350  15  8   8.0   4.4 | -28.9 -20.0  360  11  6   7.8   4.3
 22000 -27.4 -17.3  350  14  7   8.0   4.4 | -26.6 -15.9  360  12  6   7.8   4.3
 21000 -25.0 -13.0  350  14  7   7.8   4.3 | -24.2 -11.6  355  12  6   7.8   4.3
 20000 -22.6  -8.7  350  13  7   7.7   4.2 | -21.9  -7.4  350  12  6   7.8   4.3
 19500 -21.5  -6.7  350  13  7   7.7   4.2 | -20.7  -5.3  350  12  6   7.8   4.3
 19000 -20.3  -4.5  350  13  7   7.7   4.2 | -19.6  -3.3  350  12  6   7.8   4.3
 18500 -19.2  -2.6  350  13  6   7.4   4.1 | -18.4  -1.1  345  12  6   8.0   4.4
 18000 -18.1  -0.6  345  13  7   7.3   4.0 | -17.2   1.0  350  12  6   8.1   4.4
 17500 -17.0   1.4  345  13  7   7.2   3.9 | -15.9   3.4  350  12  6   7.9   4.3
 17000 -16.0   3.2  345  13  7   6.3   3.5 | -14.8   5.4  350  12  6   7.5   4.1
 16500 -14.6   5.7  345  12  6   6.4   3.5 | -13.7   7.3  355  12  6   7.7   4.2
 16000 -13.7   7.3  340  12  6   6.3   3.4 | -12.6   9.3  350  12  6   5.9   3.3
 15500 -12.8   9.0  340  11  6   6.4   3.5 | -11.7  10.9  350  12  6   6.2   3.4
 15000 -11.9  10.6  340  11  6   6.2   3.4 | -10.8  12.6  345  12  6   5.4   3.0
 14500 -11.0  12.2  335  10  5   6.3   3.4 | -10.0  14.0  340  12  6   5.3   2.9
 14000 -10.1  13.8  335  10  5   6.5   3.6 |  -8.8  16.2  335  11  6   6.4   3.5
 13500  -9.1  15.6  335  10  5   6.6   3.6 |  -7.9  17.8  335  11  6   6.5   3.5
 13000  -8.2  17.2  330  10  5   6.1   3.3 |  -7.0  19.4  330  11  6   6.7   3.7
 12500  -7.3  18.9  330   9  5   6.0   3.3 |  -6.0  21.2  330  11  5   6.8   3.7
 12000  -6.3  20.7  330   9  5   7.0   3.8 |  -5.1  22.8  325  11  5   6.0   3.3
 11750  -5.8  21.6  330   9  4   6.7   3.7 |  -4.7  23.5  325  11  5   5.6   3.1
 11500  -5.3  22.5  330   8  4   7.1   3.9 |  -4.3  24.3  325  10  5   5.7   3.1
 11250  -4.8  23.4  330   8  4   5.9   3.2 |  -3.9  25.0  325  10  5   5.9   3.2
 11000  -4.5  23.9  325   8  4   5.4   3.0 |  -3.5  25.7  325  10  5   6.2   3.4
 10750  -4.0  24.8  320   8  4   6.4   3.5 |  -3.0  26.6  325  10  5   6.1   3.4
 10500  -3.5  25.7  315   8  4   6.9   3.8 |  -2.6  27.3  325   9  5   6.4   3.5
 10250  -3.1  26.4  315   8  4   4.8   2.6 |  -2.2  28.0  320   9  5   5.5   3.0
 10000  -2.8  27.0  310   8  4   2.4   1.3 |  -1.8  28.8  320   8  4   5.0   2.7
  9750  -2.6  27.3  305   8  4   3.4   1.9 |  -1.4  29.5  315   7  4   6.3   3.4
  9500  -2.3  27.9  300   8  4   3.9   2.1 |  -1.0  30.2  315   6  3   6.6   3.6
  9250  -2.1  28.2  295   8  4   2.4   1.3 |  -0.6  30.9  310   5  2   5.2   2.8
  9000  -2.0  28.4  290   7  4   1.7   0.9 |  -0.3  31.5  300   3  2   3.2   1.8
  8750  -1.9  28.6  290   6  3   0.8   0.5 |  -0.0  32.0  280   2  1   7.8   4.3
  8500  -1.8  28.8  285   5  3   2.0   1.1 |   0.7  33.3  250   1  1  11.4   6.3
  8250  -1.5  29.3  285   4  2   6.3   3.4 |   1.5  34.7  225   1  1  10.0   5.5
  8000  -1.0  30.2  280   3  2   6.9   3.8 |   2.2  36.0  215   1  1  10.0   5.5
  7750  -0.6  30.9  270   2  1   8.1   4.4 |   3.0  37.4  205   1  1  10.6   5.8
  7500   0.1  32.2  200   1  0   9.0   4.9 |   3.8  38.8  190   1  1  11.1   6.1
  7250   0.7  33.3  190   1  0   7.8   4.3 |   4.6  40.3  185   1  1  10.7   5.9
  7000   1.3  34.3  175   1  0   8.8   4.8 |   5.4  41.7  185   1  1  11.0   6.1
  6750     M     M    M   M  M     M     M |     M     M    M   M  M     M     M

           05/02/2016 at 1500 MDT          |       05/02/2016 at 1800 MDT
                                           |
K index... -6.0  LI... +273.4              | K index... +15.7  LI... +273.6
CAPE... +14.5  CIN... -1.2                 | CAPE... +5.5  CIN... -4.0
                                           |
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 -56.9 -70.4  280  27 14   0.6   0.4 | -57.3 -71.1  275  30 15   0.8   0.4
 45000 -55.9 -68.6  280  35 18   0.3   0.2 | -56.1 -69.0  285  38 20   0.3   0.2
 40000 -56.2 -69.2  290  29 15  -0.2  -0.1 | -56.9 -70.4  290  34 18  -0.5  -0.3
 38000 -56.0 -68.8  295  24 13   0.7   0.4 | -56.6 -69.9  300  28 15   1.2   0.7
 36000 -55.6 -68.1  315  20 10   0.7   0.4 | -55.8 -68.4  330  21 11   1.2   0.7
 34000 -54.5 -66.1  335  18  9   7.5   4.1 | -54.4 -65.9  355  21 11   7.4   4.1
 32000 -50.1 -58.2  335  15  8   7.2   4.0 | -50.0 -58.0  350  21 11   7.3   4.0
 30000 -45.7 -50.3  335  14  7   8.2   4.5 | -45.5 -49.9  340  21 11   8.3   4.6
 29000 -42.6 -44.7  345  14  7   8.2   4.5 | -42.3 -44.1  340  20 10   8.3   4.6
 28000 -40.1 -40.2  350  14  7   8.2   4.5 | -39.8 -39.6  340  20 10   8.3   4.6
 27000 -37.6 -35.7  350  14  7   8.2   4.5 | -37.3 -35.1  335  20 10   8.6   4.7
 26000 -35.2 -31.4  350  13  7   8.2   4.5 | -34.8 -30.6  335  20 10   8.6   4.7
 25000 -32.7 -26.9  345  13  7   8.2   4.5 | -32.2 -26.0  340  19 10   8.6   4.7
 24000 -30.3 -22.5  345  12  6   7.9   4.4 | -29.6 -21.3  340  19 10   8.2   4.5
 23000 -28.0 -18.4  340  12  6   7.9   4.3 | -27.2 -17.0  335  19 10   8.1   4.4
 22000 -25.6 -14.1  335  12  6   7.9   4.3 | -24.8 -12.6  330  19 10   8.1   4.4
 21000 -23.3  -9.9  330  12  6   7.4   4.0 | -22.4  -8.3  330  20 10   7.2   3.9
 20000 -21.1  -6.0  325  13  7   7.4   4.1 | -20.3  -4.5  325  20 10   7.3   4.0
 19500 -20.0  -4.0  325  13  7   7.4   4.1 | -19.2  -2.6  325  20 10   7.3   4.0
 19000 -18.8  -1.8  325  13  7   7.4   4.1 | -18.1  -0.6  325  20 10   7.4   4.0
 18500 -17.7   0.1  325  14  7   7.4   4.1 | -17.1   1.2  325  20 10   6.6   3.6
 18000 -16.6   2.1  325  14  7   7.4   4.1 | -16.1   3.0  325  21 11   6.6   3.6
 17500 -15.5   4.1  325  15  7   7.5   4.1 | -15.2   4.6  325  21 11   6.8   3.7
 17000 -14.4   6.1  325  15  8   7.7   4.2 | -14.2   6.4  325  22 12   7.0   3.8
 16500 -13.2   8.2  325  15  8   7.8   4.3 | -13.2   8.2  325  24 12   7.0   3.8
 16000 -12.2  10.0  325  15  8   6.3   3.5 | -12.1  10.2  330  25 13   7.3   4.0
 15500 -11.2  11.8  330  16  8   6.4   3.5 | -11.1  12.0  330  26 13   7.3   4.0
 15000 -10.2  13.6  330  17  9   6.4   3.5 | -10.0  14.0  330  26 13   7.7   4.2
 14500  -9.3  15.3  325  18  9   6.4   3.5 |  -8.3  17.1  330  25 13   7.8   4.3
 14000  -7.8  18.0  325  18 10   7.2   3.9 |  -7.3  18.9  330  24 12   6.8   3.8
 13500  -6.8  19.8  325  19 10   7.3   4.0 |  -6.3  20.7  330  22 12   7.0   3.8
 13000  -5.8  21.6  325  19 10   6.7   3.7 |  -5.3  22.5  330  21 11   6.6   3.6
 12500  -4.8  23.4  330  18  9   7.1   3.9 |  -4.3  24.3  335  18  9   6.7   3.7
 12000  -4.0  24.8  330  17  9   4.7   2.6 |  -3.3  26.1  335  16  8   5.2   2.9
 11750  -3.6  25.5  330  15  8   5.2   2.9 |  -2.9  26.8  335  14  7   5.1   2.8
 11500  -3.3  26.1  335  14  7   5.4   3.0 |  -2.5  27.5  340  13  6   4.9   2.7
 11250  -3.0  26.6  340  12  6   4.6   2.5 |  -2.1  28.2  340  11  6   6.1   3.3
 11000  -2.7  27.1  345  10  5   5.8   3.2 |  -1.7  28.9  340   9  5   7.1   3.9
 10750  -2.2  28.0  350   8  4   7.7   4.2 |  -1.2  29.8  340   7  4   6.8   3.7
 10500  -1.7  28.9  360   7  3   7.4   4.1 |  -0.7  30.7  345   6  3   6.9   3.8
 10250  -1.2  29.8  010   5  3   7.3   4.0 |  -0.3  31.5  350   4  2   7.3   4.0
 10000  -0.7  30.7  010   5  3   7.9   4.3 |   0.3  32.5  350   4  2   8.5   4.7
  9750  -0.1  31.8  015   5  2   9.6   5.3 |   1.0  33.8  355   4  2   9.8   5.4
  9500   0.6  33.1  020   4  2  10.1   5.5 |   1.7  35.1  360   3  2  10.1   5.6
  9250   1.4  34.5  025   4  2   9.5   5.2 |   2.4  36.3  005   3  2   9.5   5.2
  9000   2.0  35.6  030   4  2   9.0   5.0 |   3.1  37.6  010   3  1   8.9   4.9
  8750   2.7  36.9  030   4  2  10.4   5.7 |   3.8  38.8  010   3  1  10.2   5.6
  8500   3.6  38.5  035   4  2  11.2   6.2 |   4.6  40.3  015   3  1  10.9   6.0
  8250   4.4  39.9  035   3  2  10.4   5.7 |   5.4  41.7  015   3  1   9.9   5.5
  8000   5.1  41.2  040   3  2  10.4   5.7 |   6.1  43.0  015   2  1   9.8   5.4
  7750   5.9  42.6  040   3  2  10.2   5.6 |   6.8  44.2  015   2  1   9.6   5.3
  7500   6.7  44.1  045   3  2  10.9   6.0 |   7.5  45.5  020   2  1   8.3   4.6
  7250   7.5  45.5  045   3  2  11.9   6.5 |   8.1  46.6  020   2  1   7.5   4.1
  7000   8.3  46.9  050   3  2  11.2   6.1 |   8.6  47.5  020   2  1   7.9   4.3
  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



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