(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