Cloudy with a Chance of War (2014)

At the front lines, and in the rest billets where the corps was rotated out for a break every few weeks, Richardson was looking for a way to forecast the weather. And so for the next few years Richardson’s theories of war and weather advanced in and around the combat zone. Richardson divided the 25 big blocks into two types: P cells, for which he recorded the atmospheric pressure, moisture and temperature; and M cells, for which he calculated wind speed and direction.

Source: nautil.us