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# Pressure and Rainfall

Investigating the Link Between Between Pressure and Rainfall

Teachers Notes

Here is some data collected by a weather station on the outskirts of Edinburgh, at the start of 2019.

 Date Atmospheric Pressure (hPa) Rainfall (mm) 10/12/2018 1025 0.0 11/12/2018 1020 0.0 12/12/2018 1019 0.0 13/12/2018 1022 0.0 14/12/2018 1017 0.0 15/12/2018 988 1.0 16/12/2018 1005 5.1 17/12/2018 1005 0.3 18/12/2018 996 1.5 19/12/2018 995 0.3 20/12/2018 995 0.5 21/12/2018 1000 0.5 22/12/2018 1014 0.0 23/12/2018 1027 0.0 24/12/2018 1032 0.3 25/12/2018 1026 0.3 26/12/2018 1023 0.0 27/12/2018 1023 0.0 28/12/2018 1022 0.0 29/12/2018 1030 2.3 30/12/2018 1030 0.3 31/12/2018 1026 0.0 01/01/2019 1044 0.0 02/01/2019 1043 0.0 03/01/2019 1041 0.0 04/01/2019 1039 0.0 05/01/2019 1034 0.0 06/01/2019 1031 1.0 07/01/2019 1024 0.0 08/01/2019 1033 0.0 09/01/2019 1031 0.0

Using this data, draw a graph of rainfall against pressure.

Now use this information to complete the following sentences:

The most it rained in one day was _______________mm.

It didn’t rain at all on ____________ days.

The highest pressure recorded was ______________hPa (a hPa is the same as a millibar).

The lowest pressure recorded was _______________hPa.

Does it always rain when the pressure is low? Use figures to justify your answer.

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Does it ever rain when the pressure is high? Use figures to justify your answer.

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Many weather apps assume that if the pressure is low, it will rain. Does your graph justify this assumption?

_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Extension:

Here are the weather maps for 4 of the days when it rained: the first 3 show when the pressure was low and the 4th shows when the pressure was high and it rained.

1)

2)

3)

4)

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