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Once again, Portugal and Spain find themselves battling the aftermath of significant inundation in the wake of Tempest Claudia brought heavy rain and powerful gusts over the past seven days.

The Storm's Formation and Trajectory

This weather system originated from a low-pressure zone that had previously ushered in unseasonably early cold and snowy conditions through the eastern regions of Canada and the north-eastern United States during the beginning of the eleventh month.

Claudia moved eastward across the Atlantic Ocean over the second weekend of November before losing momentum and stopping to the northwestern area of the Iberian region, trapped within a trough of an ever more meandering jet stream.

Effects in Spain and Portugal

Spain's Galicia area in the northwest was initially impacted, with a substantial 80 to 150 millimetres of rain coming down along its Atlantic coast in just 24 hours up to the evening of Wednesday as a sluggish front of rain drifted across the western sectors of the peninsula.

Additional rainfall and electrical storms on Thursday last week led to floods to parts of Portugal where a senior pair perished in the capital Lisbon after floodwaters from the swollen Tagus invaded their residence as they slept.

Tempestuous weather lasted through the weekend, with a violent whirlwind ripping through a outdoor lodging area and a close-by inn in the town of Albufeira in Portugal's south on Saturday last week, killing an 85-year-old British woman and harming 28 individuals.

Extended Consequences across Europe

The storm produced more extensive impacts across Europe's western part. By drawing warm air from the warmer regions, the system assisted in raising temperatures in southwestern France to 85.6 degrees Fahrenheit, the nation's all-time high autumn temperature.

By Friday, this hot and moist atmospheric body clashed with a frigid air system across the northern areas of the continent, generating a rainfall belt stretching from western Ireland to Russia.

In the United Kingdom, this halting system of rain delivered record-breaking rain accumulations, leading to significant waterlogging in the Welsh region.

As Claudia loses strength in the coming days, the cold air mass will move towards the south, giving Europe its initial glimpse of the winter season.

Parallel Events in the state of California

California underwent a plume of tropical moisture the previous week, causing intense precipitation and high-velocity gusts that provoked sudden inundations and landslides in zones scarred by forest fires earlier this year.

Over two inches of rain poured down in California's southern part on Friday, with a additional two inches broadly over the state on Saturday.

In excess of 100 millimetres of rain was deposited on coastal areas of the state's south in all, hitting eight inches in total in spots on high ground.

An atmospheric river is a narrow band of hot, humid air originating from the tropics or subtropics.

Locations with fire damage including the Pacific Palisades area and Altadena region endured the worst of the flash flooding and landslides, prompting evacuations.

In other parts of the state, a man in his seventies passed away after his vehicle was washed off a inundated overpass, and a seven-year-old girl and her father were swept into the ocean by powerful waves on the Central Coast.