  A core collapse in the Milky Way will produce an enormous burst of neutrinos
in detectors world-wide. Such a burst has the potential to provide an early
warning of a supernova's appearance. I will describe the nature of the signal,
the sensitivity of current detectors, and SNEWS, the SuperNova Early Warning
System, a network designed to alert astronomers as soon as possible after the
detected neutrino signal.
