We need to find first the location, and then we need to note down the barometric pressure of each hour in tenth place without decimal like 1013.3 mb is equal to 133 and so on. And the rate can be steadily increasing, steady, steadily decreasing, steadily increasing and then falling, steadily falling and then increasing, and so on. To find the rate of increase in barometric pressure, we need to find the rate of change of barometric pressure, and this will be clear if we prepare the chart of the barometric pressure of each hour during the past three hours. The graph plotted will give us a clear indication through its slope.
