Use the text to compare and contrast high pressure systems and low pressure systems. Watch a weather report, and you'll probably hear the meteorologist talk about pressure
systems. A low pressure system develops when air becomes hot and moist compared to
the surrounding air. As the hot air expands, it rises upward, where it cools. A high
pressure system is different in that air from higher in the atmosphere sinks down. This
sinking air prevents warm air from rising, so the atmosphere is stabilized. High pressure
systems bring dry, sunny weather. In the case &f low pressure systems, the rising air
cools to the point that clouds form, and rain or snow may fall. How do meteorologists
know which pressure system is present? They detect low and high pressure systems by
measuring air pressure with electronic sensors.
High pressure systems , Low pressure systems

Occur when air sinks down

Cause clouds to form

Are detected by electronic sensors