Adjust wind data.
a. The directions reported in upper air wind data are the directions
from which the winds are blowing.
Using the reported direction,
obtain the direction toward which the fallout particles are being
blown while falling through a wind layer by adding or subtracting
3,200 mils as applicable (add 3,200 mils if the reported direction
is less than 3,200 mils and subtract if it is more than 3,200 mils).
b. The horizontal distance in kilometers traveled by a nominal size
particle (a spherical particle 143 microns in diameter) while
falling through a wind layer is obtained by multiplying the reported
wind speed in knots for the layer by the appropriate weighting
factor. Table 2-7 shows Step 1.
Adjusted Upper Air Wind Data