  After reviewing potential early indicators of an upcoming solar cycle at high
latitudes, we focus attention on the rush-to-the-poles (RTTP) phenomenon in
coronal green line emission. Considering various correlations between
properties of the RTTP with the upcoming solar cycle we find a correlation
between the rate of the RTTP and the time delay until the maximum of the next
solar cycle. On the basis of this correlation and the known internal
regularities of the sunspot number series we predict that, following a minimum
in 2019, cycle 25 will peak in late 2024 at an amplitude of about 130 (in terms
of smoothed monthly revised sunspot numbers). This slightly exceeds the
amplitude of cycle 24 but it would still make cycle 25 a fairly weak cycle.
