Omega-weather type

If then even the high level wind field ( jet stream ) moves around this vertically extended high pressure cell, the upper air flow track over northern Europe takes a curvature looking like an uppercase Omega (Fig. 4.26). Therefore this well-known weather situation, coined by bright sunshine and extended in space, is regarded as the Omega-weather type. 

FIGURE 4.26 Typical Omega-weather type—also over the Baltic Sea (500 hPa surface) on August 4, 2003, 1200 UTC (ECMWF, with pennission). Color figure on CD, Chapter 20.4. 

Thus, Vb-and Omega-weather types are not only important for the direct meteorological conditions in the Baltic Sea region, but also indirect for the basic hydrographic conditions of the whole Baltic Sea. 

---