Windspeed (23 to 27 knots) f f 



True direction from which 



wind is blowing jj 



Current oir temperature 



(31° F) 



Cloud type (Dense cirrus 

 Itches ] 



Total amount of cloud 



( Completely covered ) m 



Visibility in miles and 



fraction (3/4 mile) VV-*-^^^ 



Present weather. 



Continuous light snow WW 



Temperoture of dew- 

 point (30° F) T(J 



Cloud type ( Froctocumulus) C 



IHeight at base of cloud 



(2 = 300 to599 feet) ^ 



' sky covered 

 iddle cloud 

 (6 = 7 or 8 tenths) 



Cloud type (Altostrotus) 



Barometric pressure in 

 tenths of millibars reduced 

 to sea level. Initial 9or 10 

 and the decimol point ore 

 ppp omitted (247= 1024. 7 mb) 



Pressure change in 3 hr 

 proceeding observation 

 pp (28 = 2.8mb) 



Choracteristic of barograph 

 trace (Foiling or steady, 

 then rising, or rising, then 

 rising more quickly) 



Pius or minus sign showing 

 whether pressure is higher 

 or lower than 3 hr ago 



Time precipitotion begon 

 Rf or ended (4:3to4hrs ogo) 



Post weother (Rain) 



Amount of precipitation 

 RR (45 = 0.45 in.) 



NOTE : The letter symbols for each weother 

 element are shown above. 



Courtesy U.S. Weather Bureau 

 abridged from W.M.O. Code 



Figure 3-17. Sample plotted report. 



3-37 



