The Omega Block effect

We don’t remember the pond icing up so quickly last year.  This year, thanks to the Omega Block (another weather thingy I never heard of) , we’ve had some pretty chilly temperatures for an extended period of time. I can no longer see my koi unless they are swimming around the aerator opening. I can see some of the more colorful koi if they are swimming close to the ice. Hopefully no one will end up sticking to the ice like Cha Cha Last year.