The size of a cloud cover is typically measured in terms of its horizontal extent, or the distance from one edge of the cloud to the other. This can range from a few meters to hundreds of kilometers, depending on the type of cloud and atmospheric conditions.
The largest recorded cloud cover was a massive storm system that covered over 7.7 million square kilometers, roughly the size of the entire continent of Australia. This occurred in 1991 in the Southern Hemisphere and was known as the Great Red Spot of Jupiter.
Yes, a cloud cover can span multiple countries if it is large enough. For example, a large storm system can cover multiple states or even entire countries, as seen with hurricanes and typhoons.
The size of a cloud cover can greatly impact weather patterns. A larger cloud cover can bring more moisture and precipitation, while a smaller cloud cover may result in drier conditions. Additionally, larger cloud covers can also affect wind patterns and temperatures in the surrounding areas.
There is no specific limit to how large a cloud cover can be, as it is dependent on various factors such as atmospheric conditions and the type of cloud. However, it is unlikely that a cloud cover would cover the entire Earth's surface, as this would require a perfect combination of conditions and is not typically seen in nature.