ZCZC RNOWRKSLD
Tue Sep 16 10:41:32 2008

Slide Mountain 10 minute average data
 
 MM/DD    Time  |  Temp    Dwpt  |  RH  |      Wind (mph)
           PST  |   (F)     (F)  |      |  Dir    Speed   Gust 
_______|________|________|_______|______|_______|_______|______
  9 16    0930      61      12      15     127      11     16
  9 16    0920      60      13      15     131       9     15
  9 16    0910      60      13      15     115       9     14
  9 16    0900      59      11      15     116       6     11
  9 16    0850      59      11      15     109       6     10
  9 16    0840      59      11      15     117       6     10
  9 16    0830      58      12      16     105       8     14
  9 16    0820      58      13      16     115       9     14
  9 16    0810      58      13      17     106      10     17
  9 16    0800      57      13      17     108      10     17
  9 16    0750      57      14      18     110      10     18
  9 16    0740      56      13      17     110      11     16
  9 16    0730      57      12      17      95      11     16
  9 16    0720      56      13      17      94      11     15
  9 16    0710      56      13      17      86      11     18
  9 16    0700      56      12      17      67      10     14
  9 16    0650      56      12      17      62      11     14
  9 16    0640      55      12      18      57      11     13
  9 16    0630      55      12      18      47      10     12
  9 16    0620      55      11      18      40      10     12
  9 16    0610      54      11      18      37      10     13
  9 16    0600      54      11      18      34      11     13
  9 16    0550      54      11      18      28      10     12
  9 16    0540      53      11      18      25      10     12
  9 16    0530      53       9      16      19       9     11
  9 16    0520      54       9      16      18      10     11
  9 16    0510      53       9      17       9       9     12
  9 16    0500      53       9      17       9      10     13
  9 16    0450      54       9      16      19      12     15
  9 16    0440      54      10      16      22      14     17
  9 16    0430      54      10      17      23      15     17
  9 16    0420      54      10      16      22      15     17
  9 16    0410      54      10      17      31      15     18
  9 16    0400      54      10      17      26      13     16
  9 16    0350      54      10      17      23      12     15
  9 16    0340      55      10      17      23      11     14
  9 16    0330      55      10      17      25      12     15
  9 16    0320      55      10      17      18      10     12
  9 16    0310      55      10      16      29      11     14
  9 16    0300      55      10      16      37      12     14
  9 16    0250      55      10      16      39      11     14
  9 16    0240      55      10      16      37      11     14
  9 16    0230      55      10      16      35      10     12
  9 16    0220      55      10      16      29      10     13
  9 16    0210      55      10      16      37      11     15
  9 16    0200      55      10      16      32      12     15
  9 16    0150      55      10      16      26      11     15
  9 16    0140      55      10      17      13      10     13
  9 16    0130      55      11      17      12      10     13
  9 16    0120      55      11      17      12      10     13
  9 16    0110      55      11      17      20      10     13
  9 16    0100      55      11      17      26       9     13
  9 16    0050      55      11      17      26       8     13
  9 16    0040      56      11      16      34       7     11
  9 16    0030      56      10      16      70       3      6
  9 16    0020      56      11      16       3       2      5
  9 16    0010      56      11      16       6       1      3
  9 16    0000      56      11      16      13       2      5
  9 15    2350      56      11      16      30       6     10
  9 15    2340      56      11      17      21       4      8
  9 15    2330      55      11      17       5       0      1
  9 15    2320      55      11      17       0       0      0
  9 15    2310      55      11      17     305       0      0
  9 15    2300      55      10      16     278       1      4
  9 15    2250      56      10      16     253       0      0
  9 15    2240      56      10      16      59       1      2
  9 15    2230      56      10      15      70       1      5
  9 15    2220      56      10      15      69       6      8
  9 15    2210      56      10      15      70       7     10
  9 15    2200      56      10      15      56       5      8
  9 15    2150      56      10      16      11       1      4
  9 15    2140      55      11      17     327       2      5
  9 15    2130      55      11      17     331       4      6
  9 15    2120      55      11      18     331       6     10
  9 15    2110      55      12      18     331       6     10

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.