Why do mid latitude cyclones tend to develop along the polar front?

Warning this answer come from a website :

"The polar front is a region of enhanced temperature gradients. Thus it provides ideal conditions for the formation of mid-latitude cyclones that derive their kinetic energy from the potential energy of horizontal temperature contrasts."

I couldn't explain better than that ! ^^

Hope this helps !

Photon

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The figure is not necessarily a parallelogram because only one diagonal is bisected and only one pair of sides is congruent.