A B Stability panel LEGEND A B Freezing level panel -4 22 Figure 9-36.  Stability panel. Figure 9-35.  Composite moisture stability chart. Composite Moisture Stability Chart The composite moisture stability chart is a four-panel chart,  which depicts stability, precipitable water, freezing level,  and average relative humidity. It is a computer-generated  chart derived from upper-air observation data and is available  twice daily with a valid time of 0000Z and 1200Z. This chart  is useful for determining the characteristics of a particular  weather system with regard to atmospheric stability, moisture  content, and possible aviation hazards, such as thunderstorms  and icing.  [Figure 9-35] For the purpose of soaring flight, the stability panel located  in the upper left corner of the chart  [Figure 9-35 Panel A] can be useful when obtaining weather as it outlines areas of  stable and unstable air. The numbers on this panel resemble  fractions; the top number is the lifted index (LI) and the  lower number is the K index (KI).  [Figure 9-36]  The LI is  9-24 Figure 9-34.  Types of briefings. NOTE: The winds aloft forecasts were formally known  as FD. Sample winds aloft DATA BASED ON 010000Z VALID 010600Z FOR USE 0500-0900Z. TEMPS NEG ABV 24000 FT 3000 6000 9000 12000 18000 24000 30000 34000 39000 MKC 2426 2726-09 2826-14 2930-21 2744-32 2751-41 275550 276050 276547 Sample message decoded: DATA BASED ON 010000Z Forecast data is based on computer forecasts generated the first day of the  month at 0000 UTC.  VALID 010600Z FOR USE 0500-0900Z. TEMPS NEG ABV 24000 The valid time of the forecast is the first day of the month at 0600 UTC. The  forecast winds and temperature are to be used between 0500 and 0900 UTC.  Temperatures are negative above 24,000 feet.  FT 3000 6000 9000 12000 18000 24000 30000 34000 39000 FT indicates the forecast location, the numbers indicate the forecast levels.  MKC 2426 2726-09 2826-14 2930-21 2744-32 2751-41 275550 276050 276547 This example shows data for MKC (Kansas City, MO). The 3,000 foot wind is  forecast to be 240 degrees at 26 knots. The 6,000 foot wind is forecast to be  270 degrees at 26 knots and the air temperature is forecast to be -9 degrees  Celsius. The 30,000 foot wind is forecast to be 270 degrees at 55 knots with  the air temperature forecast to be -50 degrees Celsius.  If a coded direction is more than "36," then the wind speed is 100 knots or more.  Therefore, if the direction number is between 51 and 86, the wind speed will be  over 100 knots. For example, a forecast at 39,000 feet of "731960" shows a  wind direction from 230 degrees (73-50=23) and the speed is 119 knots  (100+19=119). The temperature is minus 60 degrees Celcius.  If the wind speed is forecast to be 200 knots or greater, the wind group is coded  as 199 knots. For example, "7799" is decoded as 270 degrees at 199 knots or  greater.  Wind direction is coded to the nearest 10 degrees. When the forecast speed is  less than 5 knots, the coded group is "9900" and read, "LIGHT AND  VARIABLE." 