Which of the following is a sign of a developing storm?

A sudden drop in temperature is a significant indicator of a developing storm. When a storm is approaching, it can cause changes in atmospheric pressure and temperature. Typically, as a storm system moves in, cooler air is drawn in, leading to a noticeable drop in temperature. This change often occurs as warm, moist air is replaced by cooler, denser air associated with storm fronts.

In contrast, clear skies indicate stable weather conditions, while increased bird activity can be more ambiguous since birds may react to changing weather in various ways. Calm water is often associated with stable weather rather than storm development. Understanding these signs can help boaters prepare for inclement weather and ensure their safety on the water.