Scientists say that nuclear bomb testing during the 1950’s and 1960’s Cold War changed rainfall patterns thousands of miles from the detonation sites. The electric charge released by nuclear radiation impacted rainclouds, causing them to thicken and produce 24% more rain.
Radioactivity ionizes the air and releases an electric charge. The massive electric charge created by an atomic bomb causes water droplets in the atmosphere to collide and combine making even larger water droplets.
Scientists were able to confirm this by studying historical weather patterns compared to nuclear testing activities.