Europe and U.S. Weather Swing: From Arctic Chill to Early Summer Heat

After more than a week of temperatures 10-15 °C below the seasonal norm, a sharp reversal is forecast for western and central Europe. By Friday, highs in France and England are expected to climb 15 °C from the previous week, while Spain and Portugal could reach the mid- to high-30s °C. Overnight lows in those regions may even exceed the daytime highs recorded during the cold spell. A similar contrast is unfolding in the United States, where a cold surge from Canada is colliding with warm, humid air across the central plains.

The Guardian

The cold snap was produced by a blocking high over the North Atlantic that forced Arctic air southward, combined with a slow-moving low-pressure system across southern Scandinavia. An extension of that low toward the north-west of Europe later cut off the northerly flow, allowing winds to shift westerly. A new high-pressure ridge is now projected to build over western Europe, drawing hot air north from North Africa and setting the stage for the upcoming heat surge.

The Guardian

• Cold anomaly: Temperatures 10-15 °C below average persisted for more than a week.

The Guardian

• Lightning activity: 750,000 lightning strikes were recorded across Europe and surrounding areas between 11 May and 16 May.

The Guardian

• Snowfall forecast: Up to 46 cm (18 in) of snow is possible on the highest terrain of Wyoming, northern Colorado and north-east Utah, with winds up to 60 mph (96 km/h) capable of producing blizzards.

The Guardian

• Tornado risk: The Storm Prediction Center assigned a 15 % probability of tornadoes for Monday across four central U.S. states, affecting an area home to roughly 900,000 people.

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• Serbia’s national weather and hydrological service issued red warnings for strong winds, heavy rainfall and hail.

The Guardian

• U.S. Storm Prediction Center warned of a 15 % tornado probability for Monday across the central states.

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• Overnight frosts damaged crops and forced gardeners to protect vulnerable plants.

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• In France, grape growers ignited small fires in vineyards to shield vines from freezing temperatures.

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• Red-flag warnings were posted in several U.S. states as gusty winds and low humidity heightened wildfire risk.

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Such extensive cold spells have become increasingly rare in recent decades. Europe continues to warm faster than any other continent, a trend linked to the broader climate crisis. The current swing underscores how short-term atmospheric patterns can still produce extreme cold even as long-term warming progresses.

The Guardian

A large high-pressure system is expected to dominate western Europe later this week, ushering in hot air from North Africa and driving temperatures upward by up to 15 °C in France and England. In the United States, the clash of cold Canadian air with warm southern air will likely sustain thunderstorm development and maintain the elevated tornado risk on Monday. Meanwhile, higher elevations in the Rocky Mountain West should monitor for heavy snowfall and blizzard conditions. Authorities across both regions are advised to stay alert to rapidly changing weather and associated hazards.

The Guardian