Ask a weather watcher what his/her favourite weather is, & the popular answers are usually thunderstorms/hurricanes/tornadoes. Either that or it would be sunny weather, or snow. But since the atmosphere produces a host of other phenomena as well, I always find it interesting to discover those that are less well-known.
I first heard of the polar low from one of my lecturers in Reading, Dr George Craig. He was from Toronto, and had studied the convective processes in polar lows for his PhD. This was new to me because at the time I associated convection with warmer places like the tropics.
There's a nice little writeup on polar lows from Wikipedia.
MetEd also has a nice section on Polar Low Forecasting.