Colder-than-average period for most of Europe

Most of the European continent is experiencing a colder-than-average period with very cool temperatures for September, especially in the morning.

❄️ Another cold outbreak from north-western Europe will bring cooler air from the weekend starting from Ireland and UK.
This synoptic setup links back to Hurricane Fiona which will smash into eastern Canada this weekend and this is helping the high pressure and steer the flow of colder polar air which follows another frontal band which will reach the far north of Britain to end the weekend.
This front will bring much colder air to the UK with night-time frosts and wintry showers for early next week.

➡️ As Fiona approaches Atlantic Canada, it will phase with an upper trough moving east out of Canada and will be caught in the jet stream rounding the trough.
This interaction will help deepen and amplify the trough and strengthen the jet stream, which will in turn pump strong warm air advection of tropical origins north towards Greenland.
This warm air advection will help amplify northwards the ridge of high pressure downstream over the North Atlantic, this buckling the jet stream north too.
This buckling of the jet stream will force cooler polar air southwards over the NE Atlantic across the UK and northern Europe through the weekend and early next week.

☔️ Rain and snow at quite low elevations are expected over western Europe starting from the weekend.
The weather will turn unsettled for northern Spain and northern Portugal on Friday and at the weekend as a significant cold front sweeps down from NW Europe.
This will bring cloudy skies and rain to northern Iberia and this will reach through central areas to the east coast.
The same cold front will bring more cloud and outbreaks of rain over France during Friday night and then over Italy on Saturday and Sunday.
There is a high chance of rainfall at the weekend across France and Italy with snow on the Alps at quite low elevations for September.

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