This paper has the finality of describe climatology of extratropical cyclones, anticyclones and storm tracks for the NH and SH. There is a long history of studies on the characteristics of synoptic systems, beginning with classical work on mid-latitude cyclones. For the SH, analyses of pressure data provide extensive statistics of the climatology of synoptic systems. Interestingly, the anticycl...

A survey of mesoscale cyclogenesis near the Antarctic peninsula has been carried out for 1991 based on digital satellite imagery collected at Palmer Station. Slightly higher cyclonic activity was found over the Bellingshausen Sea sector (BSS) than in the Weddell Sea sector (WSS). Both sides were characterized by a pronounced formation maximum in summer and a minimum in winter. Comma clouds were...

The development of intense warm-core seclusion (Shapiro and Keyser 1990) extratropical storms can occur from several different precursor disturbances. These include tropical cyclones that have undergone extratropical transition, maritime extratropical cyclones with both coldcore baroclinic and shallow diabatically generated warm core backgrounds (Moore and Montgomery 2004), and polar lows. With...

The impact of the extratropical transition (ET) of tropical cyclones and baroclinic cyclogenesis in the Western North Pacific (WNP), Atlantic, and Southern Indian Ocean (SIO) basins on the predictability of the downstream midlatitude flow is assessed using 30 y of cases from the Global Ensemble Forecast System (GEFS) Reforecast Version 2. In all three basins, ET is associated with statistically...

Abstract Some extratropical cyclones (ETC) begin their development in close proximity to a preexisting atmospheric river (AR). This study investigates the differences cyclogenesis stage between these events and those that without an AR nearby. Well-established ETC detection methods are applied reanalysis over North Pacific during 1979–2009 cool seasons (November–March). Of 3137 cases detected, ...

The very limited instrumental record makes extensive analyses of the natural variability of global tropical cyclone activities difficult in most of the tropical cyclone basins. However, in the two regions where reasonably reliable records exist (the North Atlantic and the western North Pacific), substantial multidecadal variability (particularly for intense Atlantic hurricanes) is found, but th...

Juno discovered the circumpolar cyclones polygons on Jupiter in 2017. Fundamental questions regarding Jovian cyclogenesis concern formation mechanism and whether these are deep or shallow. Recent data by Juno/JIRAM infrared camera show that any change is an extremely unlikely event annual scale. Only once, 2019, a sixth cyclone joined pentagonal structure South, but it disappeared after 2 month...

The behavior of rotating and non-rotating aggregated convection is examined at various horizontal resolutions using the hypohydrostatic, or Reduced Acceleration in the VErtical (RAVE), rescaling. This modification of the equations of motion reduces the scale separation between convective and larger-scale motions, enabling the simultaneous and explicit representation of both types of flow in a s...