This document discusses fronts and frontogenesis. It explains that fronts were first described by Norwegian meteorologists in the early 20th century. Frontogenesis refers to the strengthening of temperature gradients along fronts, while frontolysis is the weakening. The document discusses how wind and temperature fields interact through kinematic processes like translation, rotation, divergence and deformation to increase temperature gradients and cause frontogenesis. It notes that fronts typically weaken with height and often develop and strengthen during midlatitude cyclone development, with frontogenesis and cyclogenesis going hand in hand. Surface fronts are usually quite broad, with most temperature change over 100-200km, but can be very sharp over 1-10km in some cases.