ZCZC RNOWRKSLD
Wed May  6 15:41:37 2009

Slide Mountain 10 minute average data
 
 MM/DD    Time  |  Temp    Dwpt  |  RH  |      Wind (mph)
           PST  |   (F)     (F)  |      |  Dir    Speed   Gust 
_______|________|________|_______|______|_______|_______|______
  5 6     1440      39      32      78     256      64     87
  5 6     1430      38      33      81     256      66     90
  5 6     1420      38      33      81     255      67     86
  5 6     1410      38      33      82     252      70     96
  5 6     1400      37      34      85     254      69     93
  5 6     1350      38      34      86     254      70     90
  5 6     1340      38      34      85     253      71     95
  5 6     1330      38      34      84     252      69     93
  5 6     1320      38      34      85     252      70     88
  5 6     1310      38      34      86     256      70     97
  5 6     1300      38      34      85     252      71    100
  5 6     1250      38      34      84     255      72    100
  5 6     1240      38      34      85     254      70     96
  5 6     1230      38      34      83     254      69     98
  5 6     1220      38      33      81     253      67     89
  5 6     1210      38      33      82     250      68     90
  5 6     1200      38      33      83     252      69     84
  5 6     1150      38      33      82     251      67     87
  5 6     1140      38      33      82     251      65     86
  5 6     1130      37      32      82     250      68     92
  5 6     1120      37      32      82     249      66     89
  5 6     1110      37      32      82     254      66     85
  5 6     1100      37      32      82     252      63     80
  5 6     1050      37      32      81     252      66     88
  5 6     1040      37      31      80     250      64     84
  5 6     1030      37      31      78     251      63     89
  5 6     1020      37      31      78     252      62     82
  5 6     1010      37      30      77     252      62     83
  5 6     1000      36      30      76     251      60     78
  5 6     0950      36      28      71     251      58     71
  5 6     0940      36      27      70     254      56     81
  5 6     0930      36      25      66     253      57     76
  5 6     0920      36      24      63     251      53     67
  5 6     0910      35      23      60     251      51     65
  5 6     0900      36      24      62     250      50     71
  5 6     0850      36      24      62     248      50     67
  5 6     0840      35      23      60     251      47     65
  5 6     0830      35      23      61     251      51     67
  5 6     0820      35      23      60     250      50     65
  5 6     0810      35      22      58     249      48     70
  5 6     0800      35      23      60     251      47     62
  5 6     0750      35      23      62     251      46     57
  5 6     0740      35      24      64     252      50     66
  5 6     0730      34      23      64     255      48     60
  5 6     0720      34      22      62     254      47     58
  5 6     0710      33      20      58     256      47     61
  5 6     0700      33      19      55     259      48     64
  5 6     0650      33      17      53     257      49     61
  5 6     0640      32      17      52     257      50     63
  5 6     0630      32      18      54     256      50     64
  5 6     0620      32      19      57     259      51     67
  5 6     0610      32      19      59     259      53     63
  5 6     0600      33      21      62     261      54     69
  5 6     0550      34      22      62     260      55     75
  5 6     0540      34      22      61     263      57     76
  5 6     0530      33      21      60     263      62     82
  5 6     0520      34      21      60     264      61     81
  5 6     0510      34      21      58     264      64     87
  5 6     0500      34      20      57     265      62     83
  5 6     0450      34      18      51     262      62     83
  5 6     0440      33      16      49     264      61     78
  5 6     0430      33      15      46     263      59     79
  5 6     0420      33      15      47     257      59     74
  5 6     0410      33      15      48     257      62     76
  5 6     0400      32      13      45     258      61     75
  5 6     0350      32      11      42     260      61     73
  5 6     0340      31      13      48     259      59     73
  5 6     0330      30      16      55     260      55     68
  5 6     0320      31      14      49     261      56     70
  5 6     0310      31      12      43     263      60     77
  5 6     0300      31      11      42     259      60     73
  5 6     0250      32      12      43     261      59     72
  5 6     0240      32      12      44     260      62     77
  5 6     0230      32      14      47     262      63     74
  5 6     0220      31      17      57     262      60     70

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.