V-Adv 500: Vorticity advection across the Pacific in 105/(s*6h) (colored lines) Geopotential in 500 hPa (solid, black lines) The two types of vorticity advection are positive (PVA) and negative vorticity advection (NVA). ![]() In operational meteorology Vorticity advection maps are used to identify areas with vertical air motion to see where clouds, precipitation or clear conditions are likely to occur. Keep in mind, however, that PVA is not the same as upward vertical motion. Here temperature advection is important too. GMT = Greenwich Mean Time |