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Pattern

*Polar vortex cold* The tropospheric core of the polar vortex will meet high pressure from the North Pacific, initiating -30°C air mass transport into the United States next week!

Polar vortex covers a large part of the Northern hemisphere. It starts on the ground, and goes all the way up high into the stratosphere, …

Read More about *Polar vortex cold* The tropospheric core of the polar vortex will meet high pressure from the North Pacific, initiating -30°C air mass transport into the United States next week!

*Weekly outlook* A change in the sub-polar circulation is coming, as the tropospheric polar vortex tries to re-organize. Cold air and snow likely over Europe and the USA!

While the stratospheric polar vortex is getting ready for the strong temperature and pressure dynamics in the coming week, its tropospheric counterpart is trying to …

Read More about *Weekly outlook* A change in the sub-polar circulation is coming, as the tropospheric polar vortex tries to re-organize. Cold air and snow likely over Europe and the USA!

A dangerous cold front pushes across S France and W Alps today and tonight, enhancing flooding threat and bring a lot of snow in the mountains

Yet another very deep upper-level trough / cold-core low has developed over the WSW Europe. An associated large surface cyclone and the frontal system will …

Read More about A dangerous cold front pushes across S France and W Alps today and tonight, enhancing flooding threat and bring a lot of snow in the mountains

Extreme amount of rainfall (locally 300-400 mm) is expected across the western Alps through the next 3 days, Oct 19-21st

The first serious autumn pattern is establishing over the Alps this weekend as major rainfall event is expected. Locally, more than 300-400 mm seems increasingly …

Read More about Extreme amount of rainfall (locally 300-400 mm) is expected across the western Alps through the next 3 days, Oct 19-21st