As mentioned in the discussion on air pressure, air molecules across the surface of the earth move (i.e. the wind blows) from higher surface pressure towards lower pressure. This air moving towards the center of low pressure is forced to rise at the center of low pressure. This rising air leads to precipitation.
Rising air (and thus rainfall) also typically occurs along the boundaries surface fronts as well. Warm air is forced up and over colder air which leads to rainfall. Oftentimes, the strength of the precipitation is related to the strength and speed of the frontal boundaries.
Does precipitation occur along the fronts?
Below are images of the 24-hour precipitation areas and amounts during a strong frontal passage in April, 2005.
April 22, 2005 ending at 7:00am E.S.T
April 23, 2005 ending at 7:00am E.S.T
April 24, 2005 ending at 7:00am E.S.T
April 25, 2005 ending at 7:00am E.S.T
Questions to address about rainfall
How does the rainfall change in West Virginia between April 22 and 25?
Which day brought the most rainfall to West Virginia?
How does this rainfall pattern support the passage of a cold front?
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