TM 3-6665-304-10
ground zero, and the predicted area hazard will be a circle around group zero. When this special case applies, the data
line on the effective downwind message for the particular yield group will contain only three digits. The three digits
represent the downwind distance of Zone I in kilometers. A circle of this radius drawn around ground zero will define Zone
I. A second circle of twice this radius will define Zone II . Fallout time-of-arrival will have no meaning. In this case and will
not be represented on the prediction plot.
b. Warning Area Angle Increased. A fixed warning area angle of 40 degrees is formed by the radial lines on the
area predictor. In very infrequent instances, the fallout wind vector plot prepared by the Tactical Operations Center may
indicate a warning area angle greater than 40 degrees. In these instances, the effective downwind message will indicate
the greater angle in parentheses at the end of the line of the yield group affected. Subordinate units must expand the
warning area beyond the fixed 40-degree angle of the area predictor to correspond with the angle given.
8.
Sample Problem
a. Situation. The 2d Bn, 62d, Inf is operating
2-7
