ZCZC RNOWRKSLD
Wed Aug 20 06:41:31 2008

Slide Mountain 10 minute average data
 
 MM/DD    Time  |  Temp    Dwpt  |  RH  |      Wind (mph)
           PST  |   (F)     (F)  |      |  Dir    Speed   Gust 
_______|________|________|_______|______|_______|_______|______
  8 20    0530      49      29      45     325       9     13
  8 20    0520      49      28      44     331      13     17
  8 20    0510      49      28      44     334      14     22
  8 20    0500      49      28      45     335      13     20
  8 20    0450      48      28      45     321      10     14
  8 20    0440      48      28      44     292      10     16
  8 20    0430      48      27      44     287      12     15
  8 20    0420      48      27      44     302       9     17
  8 20    0410      48      26      42     326      11     14
  8 20    0400      48      25      40     334      10     12
  8 20    0350      48      24      39     320      11     16
  8 20    0340      48      24      38     286      17     21
  8 20    0330      47      23      38     285      18     24
  8 20    0320      46      22      37     290      14     19
  8 20    0310      47      21      36     289      15     19
  8 20    0300      48      22      36     284      18     22
  8 20    0250      48      22      36     281      20     23
  8 20    0240      47      21      35     280      23     26
  8 20    0230      46      19      34     283      21     25
  8 20    0220      45      16      31     284      21     24
  8 20    0210      45      15      30     283      22     25
  8 20    0200      45      15      29     283      21     24
  8 20    0150      45      15      29     283      22     25
  8 20    0140      46      14      27     278      23     26
  8 20    0130      46      14      26     276      23     27
  8 20    0120      47      14      26     275      23     27
  8 20    0110      46      14      27     277      24     28
  8 20    0100      45      14      28     278      25     29
  8 20    0050      44      14      29     279      24     29
  8 20    0040      44      14      29     281      20     24
  8 20    0030      45      14      28     270      21     25
  8 20    0020      45      12      26     272      20     23
  8 20    0010      46      11      24     270      19     23
  8 20    0000      46      10      24     266      19     22
  8 19    2350      46      14      27     266      20     24
  8 19    2340      46      15      28     265      21     26
  8 19    2330      46      13      27     268      19     22
  8 19    2320      45      13      26     269      19     22
  8 19    2310      46      10      23     265      17     22
  8 19    2300      46      12      25     279      15     19
  8 19    2250      46      14      27     273      17     21
  8 19    2240      46      12      25     266      20     25
  8 19    2230      46      13      25     264      21     26
  8 19    2220      46      15      29     265      20     26
  8 19    2210      46      17      30     266      20     23
  8 19    2200      46      16      29     262      19     22
  8 19    2150      46      20      35     261      21     25
  8 19    2140      46      23      40     263      19     23
  8 19    2130      46      22      38     260      20     24
  8 19    2120      46      27      49     262      18     22
  8 19    2110      45      31      57     262      19     23
  8 19    2100      45      32      60     264      17     21
  8 19    2050      45      31      57     264      16     19
  8 19    2040      45      30      55     266      17     21
  8 19    2030      45      28      52     267      17     20
  8 19    2020      45      27      49     267      17     20
  8 19    2010      45      26      48     267      20     23
  8 19    2000      45      26      46     265      20     23
  8 19    1950      45      25      44     263      20     25
  8 19    1940      46      24      42     262      21     24
  8 19    1930      46      21      37     262      20     24
  8 19    1920      46      18      32     262      20     26
  8 19    1910      46      17      30     264      22     26
  8 19    1900      46      15      27     262      24     31
  8 19    1850      47      15      28     264      26     33
  8 19    1840      47      16      28     265      25     31
  8 19    1830      48      18      30     261      23     29
  8 19    1820      48      20      33     268      23     28
  8 19    1810      49      23      35     258      21     29
  8 19    1800      49      25      38     264      23     29
  8 19    1750      49      26      39     267      22     29
  8 19    1740      50      26      40     268      23     30
  8 19    1730      49      26      40     268      28     35
  8 19    1720      50      27      40     262      25     33
  8 19    1710      51      27      39     250      21     29

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.