What are the key warning signs of a storm while out on Lake Ontario?

The key warning signs of a storm while out on Lake Ontario include darkening skies and increasing winds. These phenomena are indicators that weather conditions are deteriorating and a storm may be approaching. Darkening skies signal a buildup of clouds, which often precede precipitation and thunderstorms. Increasing winds typically accompany storms, indicating changing weather patterns and can also lead to rougher water conditions.

Other options, such as high temperatures and low humidity, do not necessarily correlate with the immediate threat of a storm; they may actually indicate stable weather. Meanwhile, clear skies and a warm breeze suggest calm weather, offering no warning of impending storms. Birds flying low and quiet water can sometimes be associated with a change in weather, but they are not definitive indicators of an approaching storm compared to the direct signs of darkening skies and increasing winds. Therefore, recognizing these specific changes in the environment is crucial for ensuring safety while on the lake.