The 2013 Es season has started, with 50MHz openings centered over the northern Adriatic over the last couple of days, drifting up to the southern Baltic. The maximum usable frequency (MUF) has risen into the low end of Band II today, i.e. around 90MHz.
As usual, 2m dx-ers (including me) will be keeping their fingers crossed for a good Es season this year, with the opportunity to work great distances up to 2000km, and rarely beyond!
More information on Sporadic E propagation can be found on Volker, DF5AI’s excellent website at DF5AI.net.
A useful tool for analysing real-time (and historical) Es openings is Dave, G7RAU’s LiveMuf. I find it useful to have this program running practically all the time during the Summer months!