  We investigate the propagation of the 2015 June 21 CME-driven shock as
revealed by the type II bursts at metric and longer wavelengths and coronagraph
observations. The CME was associated with the second largest geomagnetic storm
of solar cycle 24 and a large solar energetic particle (SEP) event. The
eruption consisted of two M-class flares, with the first one being confined,
with no metric or interplanetary radio bursts. However, there was intense
microwave burst, indicating accelerated particles injected toward the Sun. The
second flare was eruptive that resulted in a halo CME. The CME was deflected
primarily by an equatorial coronal hole that resulted in the modification of
the intensity profile of the associated SEP event and the duration of the CME
at Earth. The interplanetary type II burst was particularly intense and was
visible from the corona all the way to the vicinity of the Wind spacecraft with
fundamental-harmonic structure. We computed the shock speed using the type II
drift rates at various heliocentric distances and obtained information on the
evolution of the shock that matched coronagraph observations near the Sun and
in-situ observations near Earth. The depth of the geomagnetic storm is
consistent with the 1-AU speed of the CME and the magnitude of the southward
component.
