Use the scenario to answer the question.
A weather forecast predicts that a sunny week will be followed by a rainy weekend.
Which pressure systems are likely to occur?
first a low-pressure system, and then another low-pressure system
first a low-pressure system, and then a high-pressure system
first a high-pressure system, and then another high-pressure system
first a high-pressure system, and then a low-pressure system
The most likely scenario is first a high-pressure system, and then a low-pressure system.
A sunny week typically indicates the presence of a high-pressure system, as high-pressure systems often bring clear skies and fair weather. However, if a rainy weekend is predicted, it is likely because a low-pressure system is moving in. Low-pressure systems are associated with stormy or unsettled weather, typically bringing rain and cloudiness. Therefore, the transition from a sunny week to a rainy weekend would suggest a shift from a high-pressure system to a low-pressure system.