ZCZC RNOWRKSLD
Sat Nov  7 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 7     1430      35      23      62     268      19     25
 11 7     1420      35      24      63     269      17     24
 11 7     1410      35      24      64     268      18     24
 11 7     1400      35      24      63     268      17     22
 11 7     1350      35      24      63     264      16     23
 11 7     1340      36      24      62     256      14     23
 11 7     1330      35      24      65     260      10     18
 11 7     1320      35      25      65     273      11     19
 11 7     1310      35      25      66     265      12     18
 11 7     1300      35      25      67     268      11     18
 11 7     1250      34      24      66     269      14     23
 11 7     1240      35      27      70     267       8     18
 11 7     1230      35      27      73     268       9     15
 11 7     1220      35      27      71     269       7     16
 11 7     1210      35      26      70     278       4     10
 11 7     1200      35      27      72     281       2      6
 11 7     1150      34      27      76     263       5     12
 11 7     1140      33      27      76     247       9     16
 11 7     1130      33      27      78     244       7     12
 11 7     1120      33      27      79     245       7     12
 11 7     1110      33      28      81     243       7     11
 11 7     1100      32      28      86     247       9     13
 11 7     1050      32      30      89     250       5     11
 11 7     1040      32      30      91     247       4     11
 11 7     1030      31      30      93     253       4      8
 11 7     1020      31      29      94     242       4     14
 11 7     1010      31      30      95     253       4     14
 11 7     1000      31      30      95     239       3     11
 11 7     0950      30      29      95     235       1      5
 11 7     0940      31      30      96     216       3      6
 11 7     0930      30      29      96     180       3      6
 11 7     0920      31      30      97     171       0      3
 11 7     0910      29      28      96     244       0      2
 11 7     0900      28      27      95     235       2      5
 11 7     0850      28      27      95     261       0      2
 11 7     0840      27      26      95     291       1      5
 11 7     0830      26      25      95     273       5      8
 11 7     0820      25      24      95     271       9     13
 11 7     0810      25      24      95     273      12     16
 11 7     0800      25      23      95     266      13     16
 11 7     0750      24      23      95     264      13     16
 11 7     0740      25      23      95     267      13     17
 11 7     0730      25      24      96     267      14     19
 11 7     0720      24      24      96     271      16     19
 11 7     0710      25      24      96     269      17     20
 11 7     0700      24      24      97     269      19     23
 11 7     0650      24      23      97     271      21     27
 11 7     0640      24      24      97     267      23     28
 11 7     0630      25      24      97     266      24     27
 11 7     0620      25      24      97     265      24     28
 11 7     0610      26      25      97     264      22     29
 11 7     0600      26      25      97     267      20     27
 11 7     0550      26      25      97     262      18     23
 11 7     0540      26      26      97     264      21     28
 11 7     0530      26      26      98     264      23     29
 11 7     0520      26      26      98     262      23     29
 11 7     0510      27      26      98     264      24     30
 11 7     0500      27      26      98     261      24     31
 11 7     0450      27      26      98     259      29     38
 11 7     0440      26      26      98     256      27     35
 11 7     0430      26      26      97     256      25     33
 11 7     0420      26      26      98     261      29     37
 11 7     0410      26      26      98     261      30     40
 11 7     0400      26      26      98     260      29     37
 11 7     0350      26      26      98     261      30     42
 11 7     0340      26      26      98     257      29     37
 11 7     0330      26      26      97     259      32     41
 11 7     0320      26      26      98     259      33     43
 11 7     0310      26      26      98     259      34     45
 11 7     0300      26      25      97     260      34     44
 11 7     0250      26      25      97     262      34     44
 11 7     0240      26      26      98     261      30     40
 11 7     0230      27      26      98     265      29     37
 11 7     0220      27      26      98     262      33     44
 11 7     0210      27      26      98     262      32     43

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.