ZCZC RNOWRKSLD
Wed Nov 25 06:41:34 2009

Slide Mountain 10 minute average data
 
 MM/DD    Time  |  Temp    Dwpt  |  RH  |      Wind (mph)
           PST  |   (F)     (F)  |      |  Dir    Speed   Gust 
_______|________|________|_______|______|_______|_______|______
 11 25    0630      30      13      48     103      24     35
 11 25    0620      30      13      50     102      23     29
 11 25    0610      30      14      52      97      22     27
 11 25    0600      30      14      52      91      21     27
 11 25    0550      30      14      52      92      24     29
 11 25    0540      30      14      52      90      24     28
 11 25    0530      30      14      51      93      26     32
 11 25    0520      30      14      52      95      25     30
 11 25    0510      30      14      51      93      25     30
 11 25    0500      29      14      54      88      25     29
 11 25    0450      29      15      55      88      25     29
 11 25    0440      29      15      55      88      24     28
 11 25    0430      29      15      55      88      25     29
 11 25    0420      29      15      55      88      24     28
 11 25    0410      29      15      54      88      24     28
 11 25    0400      29      15      54      90      23     29
 11 25    0350      29      15      54      86      21     24
 11 25    0340      29      14      53      86      23     27
 11 25    0330      29      14      53      89      21     25
 11 25    0320      29      14      52      88      20     23
 11 25    0310      29      14      52      88      20     23
 11 25    0300      29      14      52      86      20     24
 11 25    0250      29      13      51      87      21     25
 11 25    0240      29      13      50      86      23     27
 11 25    0230      29      13      50      87      23     28
 11 25    0220      30      14      50      85      25     29
 11 25    0210      30      14      51      87      26     31
 11 25    0200      30      14      52      86      24     30
 11 25    0150      29      14      53      88      21     25
 11 25    0140      29      14      53      86      22     26
 11 25    0130      29      14      53      86      24     28
 11 25    0120      29      14      52      86      25     28
 11 25    0110      30      14      52      87      24     28
 11 25    0100      30      14      52      85      24     28
 11 25    0050      30      14      52      87      26     29
 11 25    0040      30      15      53      85      25     29
 11 25    0030      30      15      52      86      23     27
 11 25    0020      30      15      52      84      25     29
 11 25    0010      29      15      54      85      27     31
 11 25    0000      29      16      56      85      27     32
 11 24    2350      29      16      56      84      26     31
 11 24    2340      29      16      59      80      26     32
 11 24    2330      29      17      60      77      26     32
 11 24    2320      29      17      61      75      26     31
 11 24    2310      29      16      58      75      26     30
 11 24    2300      29      17      59      77      26     30
 11 24    2250      29      17      60      77      25     30
 11 24    2240      29      17      60      77      25     30
 11 24    2230      29      17      60      76      25     30
 11 24    2220      29      17      60      74      26     32
 11 24    2210      29      17      60      76      26     31
 11 24    2200      29      17      60      74      27     30
 11 24    2150      29      17      60      76      26     30
 11 24    2140      28      17      61      75      25     28
 11 24    2130      28      17      61      80      26     31
 11 24    2120      28      17      62      79      26     32
 11 24    2110      28      17      63      79      25     31
 11 24    2100      28      17      62      81      27     34
 11 24    2050      29      17      62      79      27     35
 11 24    2040      29      17      61      77      25     30
 11 24    2030      29      17      61      73      27     31
 11 24    2020      29      17      61      70      27     33
 11 24    2010      29      17      60      65      27     33
 11 24    2000      29      16      59      64      26     32
 11 24    1950      29      16      59      62      26     33
 11 24    1940      29      16      58      60      26     33
 11 24    1930      29      16      58      61      27     33
 11 24    1920      29      16      58      60      26     31
 11 24    1910      29      16      57      55      27     31
 11 24    1900      29      16      57      55      27     29
 11 24    1850      29      15      55      52      27     32
 11 24    1840      30      15      54      52      25     30
 11 24    1830      30      15      51      52      26     29
 11 24    1820      31      14      49      51      25     30
 11 24    1810      31      13      47      53      24     28

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.