The following describes the elements and flags in each line of the listed 
data.  The information is presented in the same order as across the
individual data lines:  

DIGITS	DATA
 6    	Date: UTC date (yymmdd)
                                  
 5    	24-hour maximum temperature: Units .1 degree Celsius.  
       	  Missing is -999.                       
                                  
 2    	2-digit temperature flag for maximum temperature.

		1ST DIGIT --
		   Before 1/83
                   0 - VALID EXTREME TEMPERATURE REPORT
                   1 - INVALID EXTREME TEMPERATURE REPORT
                       - VALUE ESTIMATED
                   2 - MISSING EXTREME TEMPERATURE REPORT
                       - VALUE ESTIMATED
                   3 - NON-REPORTING TIME - VALUE REPLACED
                       BY ESTIMATE SINCE 00Z.

                   After 1/83
                   NOT USED


         	2ND DIGIT --
		   Before 1/83
                   0 - 8 - NUMBER OF MISSING AIR TEMPERATURES
                           IN VALIDATION
                   9 - EXTREME TEMPERATURE MISSING.

                   After 1/83
                   0 -   VALUE FROM EXTREME TEMPERATURE REPORTED
                   1-3   VALUE DERIVED FROM AIR TEMPERATURES
                   9 -   EXTREME TEMPERATURE MISSING
          
 5    	24-hour minimum temperature:  Units .1 degree Celsius.  
       	  Missing is -999.
          
 2    	2-digit temperature flag for minimum temperature.
		 (same as for maximum temperature)


 5    	Total precipitation reported during the 24-hour period:
       	Units .1mm.  May include precipitation which fell during 
       	previous 24-hour period, but not included in current 24-hour 
       	summary record.  Missing is -999.
         
 2    	24-hour precipitation flag.
	     	1ST DIGIT --
		   Before 7/84
                   0 - NO PRECIPITATION EVENT IN PREVIOUS 24 HOURS
                   1 - PRECIPITATION EVENT OCCURRED IN PREVIOUS 24 HOURS
                   9 - PRECIPITATION MISSING

                   From 7/84 to 12/86
                   NOT DEFINED

                   After 1/87
                   0 - THE AMOUNT WAS OBTAINED FROM A 24 HOUR PRECIPITATION
                       VALUE.
                   3 - THE AMOUNT WAS OBTAINED FROM TOTALING REPORTED AMOUNTS
                       FOR PERIOD LESS THAN 24 HOURS.
                   9 - THE REPORTED AMOUNTS WERE MISSING.

         	2ND DIGIT --
		   Before 7/84
                   NUMBER OF 3 HOUR PERIODS NOT COVERED IN PRECEDING 24
                   HOURS. 8 OR 9 INDICATES NO ESTIMATE OF AMOUNT
                   POSSIBLE.

                   After 7/84
                   CODE INDICATED THE ENDING TIME OF THE 24HR PERIOD
                   THAT THE PRECIPITATION IS SUMMARED.
                   1-0300Z 2-0600Z 3-0900Z 4-1200Z 5-1500Z 6-1800Z
                   7-2100Z 0-2400Z.  A 9 INDICATES 0600Z ON THE DAY
                   AFTER THE GREENWICH DATE INDICATED IN FIELD 1.

      
 1    	Precipitation trace flag. 1 CHARACTER. 3 VALUES POSSIBLE:
            	A. 'M' - PRECIPITATION AMOUNT MISSING.
                B. 'T' - TRACE OF PRECIPITATION IN PAST
                          24 HOURS.  SET TO 'T' WHEN DIGIT 1 OF 24 HOUR
                          PRECIPITATION FLAG (FIELD 12) IS 1 AND
                          24 HOUR PRECIPITATION AMOUNT (FIELD 11)
                          EQUALS 0.
                C. BLANK - NEITHER OF ABOVE.
     
 8    	Present/past weather codes:
          Eight 1-character codes indicating general form of present 
          weather for each of the eight synoptic reporting times, or past 
          weather if present weather is not available.  The first code is 
          for 000Z, the second for 003Z, etc.
                                                    
        Character codes are: 
          - = no station report available
          / = neither present or past weather reported
          A = hail
          B = blowing snow
          C = snow crystals
          D = dust/sand
          E = rime fog
          F = fog
          G = ground fog
          H = haze
          I = diamond dust
          J = drifting snow
          K = smoke
          L = drizzle
          M = mist
          N = not used
          O = no significant
          P = ice pellets
          Q = squall
          R = rain
          S = snow
          T = thunderstorm
          U = lightning
          V = virga
          W = showers
          X = distant precip
          Y = funnel cloud
          Z = freezing precip
                                  
 2     Number of observations received.
      
 2     Number of observations reporting present or past weather with 
         precipitation.
 
 1     blank space
                
 5     Total of precipitation which was reported and fell during the 
         24-hour period: Units .1mm.  Available 9/1/82 to 12/31/86.
 
 1     blank space
               
 5     Total of precipitation which was reported plus the amount estimated 
         during periods when reported amounts were not available:  
         Units .1mm.  Begins 9/1/82.
                  
 2     Number of 6 hour periods for which reported amounts were not 
         available and were estimated.  Begins 9/1/82.