Discuss how relief rain fall is form​

relief rainfall occurs when warm moist air from the atlantic ocean rises up over mountains when the warm air rises it cools and condenses to form clouds which bring rain.

it is formed when the moist warm air rises over a mountain barrier expands cools and condenses forming cumulo nimbus clouds which later falls in the leeward side as rainfall

your answer is "the 1950's"

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.