(2) RADEXES:
_
(a)
Surface REX:
The forecast surface RUDEX ws
obtained fra: the besic forceast hodograph. In dotail, it was detormines
by the limiting bearings on the pattern cf rosultant winds dram fra:
Ground Zero to all significant lovels.
To these limiting bearings, an
additional fiftees degree sector was added to allow for diffusion, changes
in the wind pattern from that foreeast and to allew for deviabion fron a
point scurve origin of fall-out.
Usually the E.DEE ecnsisted of two seetor
areas, one defining the low-level tradoudad portion of the cloud, aid the
other, the midelevele.
For all surface RDEXES, « radial distance for the
sestors was taken as that average distance representing six houre of f2l1
at 5,000 feet per hour.
This encunted to ecnsidering the outer area limits
om the surface contarinaticn resulting from the fall of partieales of alt
aises during the six-hour period. The surfese RADEX was iseued for 5 valid
tine of H to H plust 6 hcurs, and was revised as necessary cue to changes is
the shot forecast wads.
(vo) ddr RiEK: The forecast iir RDEK was tawtrveted
in the conventttinel names (See (3 Mareci195-33). IN general, the nothed
used on C/STLE eonsiéered tus general regions, 1.6, the wolnme af con-
teminated air frar 10,000 feet and up and tievolune from 0,000 feet oni
wp.
The first volume wis defined for the prinary use ofall test and service
aireraft operating in the shot area fron H to H plus 6 hours, and ws
disserinsted for the purpose of assisting those aireraft in avoiding contaminated regions.
‘The seeond volume ws. defined for the primary use of all