When will atmospheric pressure be at its lowest value during a thunderstorm?

The lowest atmospheric pressure during a thunderstorm typically occurs when the storm is approaching. As a thunderstorm develops, it creates a strong updraft that can lower the pressure in the surrounding area. This pressure drop is more pronounced as the storm gets closer, often resulting in noticeable changes in the atmosphere, such as the rapid onset of wind and changes in temperature.

When a thunderstorm is approaching, it can generate a significant outflow boundary, and the pressure continues to drop until the precipitation begins. This phenomenon is commonly observed and is related to the intense dynamics of storm systems, where rising warm air creates a low-pressure area.

Atmospheric pressure can fluctuate during different phases of a thunderstorm, such as during downdrafts or peak rainfall, but it is generally at its lowest as the storm approaches when the dynamics of air movement are most pronounced and the storm's influence on local pressure is strongest. Therefore, the understanding of storm dynamics supports the conclusion that atmospheric pressure reaches its lowest value right before and as the storm is approaching.