ZCZC RNOWRKSLD
Sat Nov 21 14:41:34 2009

Slide Mountain 10 minute average data
 
 MM/DD    Time  |  Temp    Dwpt  |  RH  |      Wind (mph)
           PST  |   (F)     (F)  |      |  Dir    Speed   Gust 
_______|________|________|_______|______|_______|_______|______
 11 21    1430      28      13      51     236       5     10
 11 21    1420      29      15      55     250       7      9
 11 21    1410      30      15      53     248       2      6
 11 21    1400      31      16      55     274       0      0
 11 21    1350      30      16      57     310       0      0
 11 21    1340      30      18      60     283       0      1
 11 21    1330      30      13      49     318       0      1
 11 21    1320      29      12      47     298       1      5
 11 21    1310      29      12      50     321       1      3
 11 21    1300      28       9      44     323       5      9
 11 21    1250      28       9      43     331       6     14
 11 21    1240      29      13      51     294       3     10
 11 21    1230      29      13      51     310       0      1
 11 21    1220      28      12      50     307       1      5
 11 21    1210      28      13      52     300       0      0
 11 21    1200      28      13      54     284       0      0
 11 21    1150      26      13      55     286       0      0
 11 21    1140      25      12      57     263       1      5
 11 21    1130      25      12      57     257       6      8
 11 21    1120      24      10      54     260       6      9
 11 21    1110      25      10      52     261       4      8
 11 21    1100      24      10      55     245       5      8
 11 21    1050      24       9      52     246       7     10
 11 21    1040      23       8      53     255       7     11
 11 21    1030      23      10      57     250       9     14
 11 21    1020      23      10      57     250       4      7
 11 21    1010      25       9      51     253       1      6
 11 21    1000      25      10      52     311       0      0
 11 21    0950      24       7      49     276       0      1
 11 21    0940      23       7      50     293       0      1
 11 21    0930      22       9      57     258       1      4
 11 21    0920      21       4      47     267       3      7
 11 21    0910      22       3      44     261       2      5
 11 21    0900      21       1      40     269       1      4
 11 21    0850      22       2      41     259       1      4
 11 21    0840      22       3      42     190       0      0
 11 21    0830      21       0      37     267       1      4
 11 21    0820      21      -4      31     265       2      4
 11 21    0810      20      -4      32     282       3     10
 11 21    0800      19      -4      33     271       5     11
 11 21    0750      20      -6      31     278       3      5
 11 21    0740      19      -5      32     283       1      5
 11 21    0730      18      -4      36     281       5      8
 11 21    0720      17      -4      37     267      10     17
 11 21    0710      16      -4      37     276      15     22
 11 21    0700      16      -4      39     266      15     21
 11 21    0650      16      -3      41     266      18     22
 11 21    0640      16      -2      42     265      19     28
 11 21    0630      15      -2      43     267      21     29
 11 21    0620      15       0      47     267      21     30
 11 21    0610      15       0      48     271      16     24
 11 21    0600      16       0      49     276      19     28
 11 21    0550      16       0      49     270      28     37
 11 21    0540      15       2      55     265      34     40
 11 21    0530      15       2      56     264      30     38
 11 21    0520      15       3      58     262      29     36
 11 21    0510      14       4      63     259      27     36
 11 21    0500      15       3      61     261      25     33
 11 21    0450      15       4      61     260      26     32
 11 21    0440      15       4      62     261      28     37
 11 21    0430      15       5      65     261      29     37
 11 21    0420      15       6      67     264      31     39
 11 21    0410      14       7      72     264      37     46
 11 21    0400      13       7      76     264      36     44
 11 21    0350      13       8      76     263      29     40
 11 21    0340      14       7      72     262      25     31
 11 21    0330      14       7      74     263      26     33
 11 21    0320      14       7      74     257      23     31
 11 21    0310      14       7      73     258      20     29
 11 21    0300      14       7      72     257      24     35
 11 21    0250      14       8      74     251      28     39
 11 21    0240      14       8      78     251      29     41
 11 21    0230      13       9      80     251      30     40
 11 21    0220      13       9      82     253      31     42
 11 21    0210      13       9      84     256      34     42

Convective Condensation Level (CCL) - is the height to which a parcel of air, if heated sufficiently from below, will rise adiabatically until it reaches saturation or condensation. It approximates the base height of cumulus clouds which are, or would be, produced by surface heating.

Equilibrium Level (EL) - is the height in the upper troposphere where a parcel of saturated air, rising because of its positive buoyancy, encounters negative buoyancy. It is as this point where the parcel becomes colder than the surrounding air.

K-index - is a measure of thunderstorm potential based on vertical temperature lapse rate and the moisture content in the lower atmosphere (700 mb and 850 mb). Numbers greater than 25 indicate good thunderstorm potential. Numbers greater than 35 indicate flash flood potential or thunderstorms accompanied by heavy rain. K= (850mb temp-500mb temp) + 850mb dew point-700 dew point depression

Lifting Condensation Level (LCL) - is the height at which a parcel of air becomes saturated when lifted dry-adiabatically. The LCL for a surface parcel is always at or below the CCL.

Level of Free Convection (LFC) - is the height at which a parcel of air lifted dry-adiabatically until saturated (LCL) and moist adiabatically thereafter would first become warmer (less dense) than the surrounding air. At this point the buoyancy of the parcel would become positive and the parcel would accelerate upward without further need for forced lift.

Lifted Index (LI) - determined using the temperature and dew point in the lowest 100 mb from an averaged mixing ratio. The parcel is lifted dry-adiabatically to the LCL, then moist adiabatically to 500 mb. The algebraic difference (Deg C) between the parcel temperature and the actual sounding temperature at 500 mb is the index value. Positive values imply greater stability. Values less than zero imply instability or positive buoyancy.

Maximum Altitude - Altitude determined from forecast high surface temperature expected for the day, when raised up the dry-adiabatic lapse rate curve to where it intercepts the actual sounding temperature plot.  Note: The max altitude reported here is limited to 18,000 feet by FAA regulations.

Showalter Index (SI) - determined by lifting a parcel of air using the 850 mb temperature and dewpoint dry-adiabatically to the LCL, then moist-adiabatically to 500 mb. The algebraic difference between the parcel temperature and actual sounding temperature is the index value. Positive values imply greater stability.

Soaring Index - A forecast of maximum lift rate in feet per minute (fpm) by thermals expected at the time of maximum temperature. This empirical formula is based on maximum altitude of thermals and the lapse rate from the trigger altitude 4000 feet above the surface.

Trigger Temperature - The surface temperature reached when the temperature from the morning upper air sounding at 4000 feet above the surface is lowered dry-adiabatically to the surface.

Trigger time - The local time the trigger temperature is reached.  A minimum lift rate of 260 fpm would be obtained at this time up to 4000 feet.