qCyclogenesis typically begins along the polar front but may initiate elsewhere, such as in the lee of mountains.
qMinor
perturbations occur along the boundary separating colder polar easterlies from warmer westerlies.
qA low
pressure area forms and due to the counterclockwise flow (N.H.) colder air migrates equatorward behind a developing cold front.
qWarmer air
moves poleward along a developing warm front (east of the system).
qClouds and
precipitation occur in association with converging winds of the low pressure center and along the developing fronts.