Directional VLF sferics from the Union City, Oklahoma, tornadic storm

The Naval Electronics Laboratory Center (now Naval Ocean Systems Center) made directional measurements of very low frequency sferics in the Union City, Oklahoma, tornadic storm on May 24, 1973. These data verify the interesting findings of two earlier directional sferics studies. Whereas sferics activity in tornado‐producing storms is known to peak near tornado time, all these studies show conclusively that sferics do not originate in the tornado itself but rather throughout the parent thunderstorm.