What does a 'BIG blue H' symbolize in meteorology?

The symbol of a 'BIG blue H' in meteorology specifically represents a high-pressure system. High-pressure systems are associated with descending air, which generally leads to clearer skies and stable weather conditions. This symbol is used on weather maps to indicate areas where the atmospheric pressure is higher than the surrounding areas.

In high-pressure systems, the air pressure at the surface is elevated compared to lower surrounding pressure, resulting in sunny and dry weather conditions. Understanding this symbol is crucial for interpreting weather patterns, as high-pressure systems often correlate with fair weather, while the presence of low-pressure systems, represented by a different symbol, is typically associated with cloudiness and potential precipitation.