I have been on a sailing trip to Masurian (I didn't realize that there is an English translation, Polish/original name of this region - Mazury) Lakeland several times, including 2007, about two weeks after this storm (also known as a Masurian White Storm). It is a region number two on my "the best in Poland" list
Yeah, it's a wonderful region. One of the best vacations I ever had so far. Before and after the trip I stayed with friends who live between Katowice and your hometown Krakow. Beautiful city! I also flew home from Krakow.
As you can see there is already a big overcast blanket coming in. The Captain informed us about some thunderstorms and we also had quite some turbulence. It was a fine flight, though.
Yup, that's the one. In the background you can see the Orlen gas station mast that was knocked over by the storm (saw that on the news). Here's another shot from our second stop there on the way back South to our starting port (Pisz):