A single freezing level contour line within a FRZLVL section. Represents a line at a specific altitude or a surface freezing level line.
Optional
Altitude of the freezing level in hundreds of feet (e.g. 040 = 4,000 ft). Undefined when the freezing level is at the surface.
Raw description of the contour location (e.g. "ALG 40S HNN-50SSE ETX-80SSE BGR-100SSW YSJ").
A single freezing level contour line within a FRZLVL section. Represents a line at a specific altitude or a surface freezing level line.