The surface low pressure center of the massive storm system impacting much of the country is moving into Iowa this morning. Those that are sensitive to changes in air pressure will certainly notice its passing. The featured plot looks at the frequency of 24 hour pressure changes for Des Moines based on the mean sea level pressure value. Having large day to day changes are certainly more common during the cold half of the season. Such large and powerful storm complexes need to have strong contrasts in surface temperature, so it makes sense that these systems are rarely found during the warm season.

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