An echo of intensity on
the radar screen.
How to tell the difference between a raindrop and an insect?
of a locust
Raindrops do not exceed about 6 mm. in diameter; and recorded rainfall intensities indicate that there can rarely be more than ten such drops per cubic metre in the heaviest precipitation
of water-content alone
a swarm averaging ten flying locusts per cubic metre, as recorded in the Kenya Highlands in 1952, with each locust containing about 1 c.c. of water, might be expected to give an echo of intensity at least an order of magnitude greater than that given by the very heavy precipitation considered; and it was concluded that recognizable echoes might well be given by much more attenuated swarms.