INTRODUCTION The objective of this report is to provide a ready reference of fallout patterns and related test data for those engaged in the analysis of fallout effects. This compilation was extracted from DASA 1251 "Local Fallout from Nuclear Test Detonations '' (U) Vol. 2 ''Compilation of Fallout Patterns and Related Test Data" (U) Parts 1 through 3. DASA 1251 Vol. 2 was the work of Manfred Morgenthau, Harvy Meieran, Richard Showers, Jeffrey Morse, Norman Dombeck, and Arnoldo Garcia of the U.S. Army Nuclear Defense Laboratory under Defense Atomic Support Agency (now Defense Nuclear Agency) sponsorship. Although local (early) fallout is emphasized, the data presented will be useful to those studying world-wide (delayed) fallout as well. In this report local fallout is defined as all fallout which consists principally of the larger particles that are deposited within 24 hours after the detonation. World-wide or delayed fallout is defined as fallout which consists of very small particles which descend very slowly over large areas of the earth's surface. Data resulting from each U.S. detonation are presented chronologically. For each detonation, the basic information useful for an interpretation of the fallout data is tabulated first. This is followed by both on-site and off-site fallout patterns where available. A graph of the growth-rate of the cloud and stem is presented next. Wind speed and direction are than tabulated as a function of altitude, and hodo- graphs are drawn from these data. EXPLANATION COMMENTS ON DATA PRESENTED Fallout Patterns . One or more fallout patterns are given for each event, except for those shots for which no sigificant residual radiation was observed downwind of GZ or for which no patterns were found in the literature. In the remarks included on the basic data sheet for each shot, the individual fallout patterns are discussed briefly; some comments are made for those shots for which no patterns were available. The doserate contours for the fallout patterns have been drawn to show the gamma dose rate in roentgens per hour, three feet above the ground, in terms of the one hour after burst reference time. The t7!:* approximation was used when no actual decay data was available to adjust radiation measurements to the one hour reference time. It is important to recognize the H+l hour is used as a reference time, and that only the contours from low yield weapons are complete at one hour after burst. For high yield weapons, fallout over some parts of the vast areas