Wind speed ( 23 to 27 knots )------ f f
Cloud type ( Altostrotu* )
True direction from which
wind is blowing-----------Current air température
(31° F)-------------------Total omount of cloud
( Completely covered )________
Visibility in miles ond
fraction ( 3/4 mile )_
Présent weother.
Continuous light snow
Température of dew
point ( 30° F )__
dd
-TT
Cloud type (Dense cirrus
in potches )
Ch
CM
2
Nh
Fraction of sky covered by
low or middle cloud
(6 = 7 or 8 tenths)
VV—3/4
Cloud type ( Froctocumulus)___ Cl
Height at base of cloud
(2 = 300 to 599 feet).
-wwx 30
Td Td
45
Borometric pressure in
tenths of millibars reduced
to sea level. Initial 9 or 10
ond the décimal point are
ppp____ omitted (247= 1024.7 mb)
Pressure change in 3 hours
proceeding observation
__ (28 = 2.8mb)
Characteristic of borogroph
trace (Folling or steady,
then rising.or rising,then
q____rising more quickly )
Plus or minus sign showing
whether pressure is higher
__ or lower then 3 hours ogo
Time précipitation began
__ or ended (4 = 3 to4 hrs. ogo)
yy____Post weother ( Roin)
Amount of précipitation
pp____(45 = 0.45 inches)
— 6 *^4
NOTE : The letter symbols for each weother
element are shown above.
Courtesy United States Weather Bureau
obridged from W.M.0. Code
Figure 3-10. Sample Plotted Report
3-25