Valid: Tue 13 Dec 2016 06:00 to Wed 14 Dec 2016 06:00 UTC
Issued: Mon 12 Dec 2016 21:57
SYNOPSIS / DISCUSSION
A positive tilted long-wave trough stretches from Russia towards South Balkans, pushing cold air masses of polar origin to SE Europe. An embedded short-wave trough is predicted to cross Scandinavia and Baltic States. Another trough is about to move east in NE Atlantic, affecting offshore parts of Ireland and Portugal. At the surface, a high pressure system over Central Europe prohibits any precipitation event during Tuesday. On the other hand, a low pressure system over Turkey will lead to heavy snowfall events and over Black Sea instability may produce some thundery snowfalls due to "sea-effect", similar to "lake-effect" snow bands. We expect the same conditions over the Aegean Sea but with less confident that air masses will be able to produce strong dipoles as the vertical ice water path will be shallower.
Over the Atlantic ocean, an approaching cold front during the night will be also able to produce some thunderstorms but we do not expect any threat related to convective phenomena onshore. One or two severe non-convective wind gust events may verify in West coasts of Portugal.