ZCZC RNOWRKSLD
Tue Aug 25 04:41:34 2009

Slide Mountain 10 minute average data
 
 MM/DD    Time  |  Temp    Dwpt  |  RH  |      Wind (mph)
           PST  |   (F)     (F)  |      |  Dir    Speed   Gust 
_______|________|________|_______|______|_______|_______|______
  8 25    0330      49      25      39     209       6      8
  8 25    0320      49      26      40     210       5      8
  8 25    0310      49      25      39     213       5      8
  8 25    0300      49      24      37     229       5      9
  8 25    0250      49      24      38     231       6     10
  8 25    0240      49      25      40     237       6     10
  8 25    0230      49      26      41     239       6     11
  8 25    0220      48      27      43     243       6     10
  8 25    0210      49      28      44     240       6     11
  8 25    0200      49      29      47     241       6     10
  8 25    0150      49      29      47     236       7     10
  8 25    0140      49      31      50     236       7     11
  8 25    0130      49      31      51     236       7     11
  8 25    0120      49      32      52     248       8     14
  8 25    0110      49      32      53     249       8     13
  8 25    0100      49      33      54     252       7     11
  8 25    0050      49      34      56     253       8     13
  8 25    0040      48      34      58     254       9     16
  8 25    0030      49      35      58     252       8     14
  8 25    0020      48      35      59     259       7     13
  8 25    0010      48      35      61     257       8     12
  8 25    0000      48      36      63     262       8     12
  8 24    2350      48      38      67     269       9     12
  8 24    2340      48      38      69     265       9     13
  8 24    2330      48      39      70     264      10     13
  8 24    2320      48      40      73     265       8     12
  8 24    2310      48      40      73     260       9     11
  8 24    2300      49      40      70     248       7     12
  8 24    2250      49      38      64     233       6     11
  8 24    2240      49      38      63     237       6     11
  8 24    2230      49      38      66     239       7     10
  8 24    2220      47      40      75     275       5      8
  8 24    2210      47      40      75     276       5      8
  8 24    2200      48      41      76     271       5      7
  8 24    2150      48      40      75     262       6      8
  8 24    2140      48      40      74     264       6      8
  8 24    2130      48      40      73     265       4      7
  8 24    2120      48      40      74     260       5      8
  8 24    2110      48      40      74     263       7      9
  8 24    2100      48      40      74     263       8     11
  8 24    2050      48      41      74     263       8     10
  8 24    2040      48      41      75     264       8     11
  8 24    2030      48      41      75     259       8     11
  8 24    2020      49      41      74     257       9     14
  8 24    2010      49      41      74     261       9     12
  8 24    2000      49      41      72     260       9     14
  8 24    1950      49      41      73     258       7     13
  8 24    1940      50      41      72     255       9     13
  8 24    1930      49      41      73     261      10     15
  8 24    1920      49      42      74     266      11     14
  8 24    1910      50      42      74     270      10     14
  8 24    1900      50      42      72     268      10     13
  8 24    1850      50      41      71     269      10     14
  8 24    1840      51      41      69     266      12     16
  8 24    1830      52      41      66     263      12     16
  8 24    1820      53      41      64     260      12     16
  8 24    1810      54      41      61     254      11     16
  8 24    1800      55      41      59     253      13     17
  8 24    1750      56      41      57     257      12     16
  8 24    1740      56      41      56     252      13     19
  8 24    1730      57      40      53     251      12     18
  8 24    1720      57      40      52     249      13     18
  8 24    1710      58      39      51     250      14     22
  8 24    1700      58      40      49     254      11     18
  8 24    1650      59      39      47     254      14     20
  8 24    1640      59      38      46     254      14     22
  8 24    1630      58      38      46     255      15     23
  8 24    1620      59      38      45     253      15     23
  8 24    1610      59      37      44     250      15     23
  8 24    1600      59      36      42     253      16     22
  8 24    1550      60      35      39     254      14     24
  8 24    1540      60      34      37     253      13     21
  8 24    1530      60      32      35     257      14     23
  8 24    1520      61      31      32     248      12     20
  8 24    1510      61      30      31     257      10     19

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.