Eady edge waves, frontal wave-trains and type-B cyclogenesis

Eady edge waves (EEWs) propagate on surface baroclinic zones and they resemble synoptic sub-synoptic scale frontal wave-trains. The wave-trains are frequently depicted charts, occur per se a front with local baroclinicity extremum. possible linkage of EEWs to is explored within the framework so-called ‘surface quasi-geostrophic dynamics’ by establishing properties free forced propagating an ambient flow comprising laterally confined zone. It shown that dispersion modes influenced significantly both zone’s extremum key features akin those cold warm fronts. In particular larger-scale nondispersive wave-packet can retain coherency, leading pseudo-cold possess phase speed related extremum, whereas pseudo-warm in reverse direction. Also theoretical considerations demonstrate undergo resonant secular growth. further transient or sustained forcing upper-tropospheric potential vorticity anomaly (sic. short-wave trough) serve instigate type-B cyclogenesis. More generally study hints at significance for NWP front’s structure its properties, element predictability introduced latter due dynamical selection.