Diurnal Pressure Changes

Pressure rise occurs between 0900Z and 1500Z, and pressure fall occurs between 1500Z and 0300Z. When only diurnal effects are expected (persistence) with no appreciable change in the weather pattern, the altimeter setting observed at 09Z will also be the following afternoon's lowest altimeter.
Concept Mapping Toolkit
Insitute for Human and Machine Cognition
The University of West Florida