ee) pie on ys | ez a COMeteorologists of Joint Task Force SEVEN have analyzed weather conditions following each of the explosions, and conclude: "Aside from local increases in middle and high altitude cloudiness and possibly a /\ CU few induced showers in the immediate area, thera is no evidence that \ the Pacific testa produced any noticeable effect on the weather at or near the Pacific Proving Ground. There is no basia for believing that these slight local disturbances in weather which aristed at the PPG during the test propagated outside the immediate area," As e@ result of observations of the dust from the Fraketoa volcanic explosion, which took place in the tropics in 1883, and from observations of the upper air flow pattern, it is expected that the heaviest concentrations of the dust will circumnavigate the globe in the tropice with minor northward and southward excursions of the cloud and slow mixing toward the temperate latitudes of both hemispheres. Inspection of rainfall records in the tropice indicates no unusual amounts, although the year-to-year variability is small and abnormalities would readily stand out. There is no evidence of widespread heavy tropical rainfall depleting the supplies of mofsture for drought-stricken areas of the United States or elsewhere. Turning next to the United Jtates, a study of deposited radio- United States agna whole has had much less radioactive dust settle 8if aw SCLASSIFIED 3 pe Ga = o x = [ea uy = m active dust collected during the Spring of 1954 indicates that the re 3; > m% ee me ma & ) REPRODUCED AT THE DWIGHTD. ~~ eeeeae “eee the recent Pacific test series on the weather.