A dramatic shot of a mayfly emergence and a severe thunderstorm
(supercell) coming into contact with one another is also online: image (388 K)
Radar Information
Doppler radar is a lot like sonar, except that it doesn't use sound
waves, it uses part of the electromagnetic spectrum. Doppler radar
Measures the difference between the time it emits a beam from it's
dome and the time when the beam's refelection strikes it again.
What you see on the radar is dependant upon what angle of elevation
you point the emitter (inside the dome). See the image below.
The colors you see on the radar are a color-coded representation of
the amount of reflection that was recieved by the dome. Often, the
radar beam is not wholly reflected, some of the beam travels
through what it comes into contact with. That means that the
color-code is not only a measure of how big the object(s) is but
also how dense it is. See image below.
To discern between mayflies and other things in or on the water and air,
here are a couple diagrams to help you along.
