What is indicated by dashed lines on a Surface Analysis Chart?

Dashed lines on a Surface Analysis Chart indicate a weak pressure gradient. This is important because pressure gradients are critical in meteorology, as they help determine wind speed and direction. A weak pressure gradient means that there is a smaller difference in pressure over a given distance, which typically results in lighter winds and more stable weather conditions. Understanding the portrayal of pressure gradients on these charts can help pilots anticipate weather behaviors during flight operations, particularly when flying lighter-than-air craft like balloons or airships, which are more sensitive to wind variations.