Editing Pressure system (section)

{{short description|Relative peak or lull in the sea level pressure distribution}}
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{{for|pressure systems and safety|Pressure vessel}}
[[File:Surface analysis.gif|thumb|Map of pressure systems across North America]] A '''pressure system''' is a  peak or lull in the [[Atmospheric pressure#Mean sea-level pressure|sea level pressure]] distribution, a feature of [[synoptic-scale weather]]. The surface pressure at sea level varies minimally, with the lowest value measured {{convert|87|kPa|inHg}} and the highest recorded  {{convert|108.57|kPa|inHg}}. High- and low-pressure systems evolve due to interactions of temperature differentials in the atmosphere, temperature differences between the atmosphere and water within oceans and lakes, the influence of upper-level disturbances, as well as the amount of solar heating or radiationized cooling an area receives. Pressure systems cause [[weather]] to be experienced locally. Low-pressure systems are associated with [[cloud]]s and [[precipitation (meteorology)|precipitation]] that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day. Pressure systems are analyzed by those in the field of [[meteorology]] within [[surface weather analysis|surface weather map]]s.