It was a windy trip back from Grandma's house for Thanksgiving on Sunday. We are well into the fall season and strong passing low pressure systems help to drive strong winds as was the case on Sunday. The featured chart displays a time series of sea level pressure observations from the Ames Airport for the past year. The plot nicely shows the change in variability of this atmospheric variable between the cold and warm half of the year. The increased variability during the cold season are due to the stronger storm systems and air masses. The absence of these during the summer months lead to the less variable pressure readings.

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