b. Identification of the Prediction.
The prediction is identified by recording the location of ground zero and
the date-time of burst on the predictor.
c. Effective Wind Speed and Downwind Direction.
The effective wind speed and downwind direction for the burst are taken from
the appropriate yield group data line of the effective downwind message.
d. Downwind Distances of the Zones.
The downwind distance of the zone of Immediate Operational Concern (Zone I)
is determined from the nomogram on the M5A2 Fallout Predictor.
determination is made by connecting the value of the effective wind speed
and the point on the yield scale representing the yield (using the actual or
estimated yield, not the yield group) with a hairline.
The value of the
downwind distance of Zone I, in kilometers, is read at the point of
intersection of the hairline and the Zone I downwind distance scale.
downwind distance of Zone II is twice that of Zone I.
Arcs are drawn
between the two radial lines, using GZ as center, with radii equal to the
two downwind distances determined.
Tangents are drawn from the cloud radius line for the yield group considered
to the points of intersection of the radial lines of the predictor with the
arc representing the downwind distance of Zone I.
Zones I and II are labeled, and the remainder of the prediction perimeter is
darkened with a grease pencil to emphasize the area of hazard.