Spectacular RADAR imagery of the eye of TC Zelia as it makes its way onshore to the east of Port Hedland, Western Australia.

Credit: Australian Bureau of Meteorology

Another bout of explosive cyclogenesis over the North Atlantic with "Storm Eowyn" bearing down on the UK, bringing with it strong winds and heavy rainfall. Here is ECMWF's few of the system.

The remnants of TC Sean that have transitioned into the extratropics, presumably bring with it additional moisture and diabatic heating into the mid-latitude waveguide. This process promotes anticyclogenesis in upper troposphere which in turn promotes adiabatic descent and heat into VIC next week

Secondly and I think possibly most importantly, the outflow from TC Sean promotes ridging in the upper troposphere, pushing back the jet stream to the south of WA, similar to the effect studied by @tessjparker.bsky.social in her work on SE Aus heatwaves (doi.org/10.1002/2013...)

First, TC Sean tightens up the pressure gradient, promoting and strengthening easterlies and adiabatic descent towards the coast. Some of the below trajectories into Perth highlight this effect.

Tropical vortices play a larger role in the weather over the Australian continent than strong wind and heavy rain. Despite only a glancing impact on rainfall over northern Western Australia, Tropical Cyclone Sean has and will have an impact on many region this week, but not in the way you may expect

Remarkable explosive cyclogenesis off of the west coast of North America in the forecast, with a predicted drop of over 50hPa in just 12 hours!!! I wonder if this is a record intensification for an extratropical low?