synoptic scale

https://doi.org/10.1351/goldbook.S06230
In meteorology, the size or scale of ordinary weather systems or cyclones; typically \(1000\ \text{km}\) horizontally.
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2217 [Terms] [Paper]