an ambitious proposal to cut carbon emissions, how will those who hope to succeed Chancellor Angela Merkel respond?
If only because of their sheer scale, analysts say, the floods are likely to play a significant role for voters when they go to the polls on Sept 26 to replace Ms. Merkel, who has led the country for 16 years.
The death toll in Germany climbed to at least 143 on Saturday, while the toll across the border in Belgium stood at 27, its national crisis center said. The count rose most sharply in Germany’s Ahrweiler district in Rhineland-Palatinate State, where the police said that more than 90 people had died. The authorities feared that number could yet grow.
In Germany, Europe’s largest economy and a country that prides itself on its sense of stability, the chaos wrought by nature was likely to reverberate for months, if not years.
But on Saturday, residents and rescue workers in flood-hit areas faced the more immediate and daunting task of clearing piles of debris, unclogging roads and salvaging some of the homes that had survived the deluge.
Hundreds of people remain unaccounted for, but officials have struggled to offer precise numbers.
Electricity and telephone services remain inaccessible in parts of Germany, and some roads are still impassable. That lack of access may account for the high tallies of those still considered missing. And some of those who are not accounted for could simply be away, on vacation or work assignment. In Belgium, police officers started knocking on doors to try to confirm the whereabouts of residents.
Still, officials said they expected to find additional victims.
Extreme downpours like the ones that hit Germany are one of the most visible signs that the climate is changing as a result of global warming from greenhouse gas emissions. Studies have shown a warmer atmosphere can hold more moisture, generating more rainfall.
Floods of this size have not been seen in 500 or even 1,000 years, according to meteorologists and German officials.
Rhineland-Palatinate was one of the two hardest-hit German states in the west, along with North Rhine-Westphalia. The Rhine River flows through the two regions, and the rain fell so rapidly that it engorged even small streams and tributaries not typically considered flood threats.
Germany’s president, Frank-Walter Steinmeier, traveled on Saturday to the town of Erftstadt, southwest of Cologne, where the flooding destroyed homes. Ms. Merkel planned to travel on Sunday to Schuld in Rhineland-Palatinate, which was badly hit, even as all of its 700 residents managed to survive.
There were scenes of devastation from all around Western Europe, the floods having caused damage from Switzerland to the Netherlands. But Germany was hardest hit.
Days before roiling waters tore through western Germany, a European weather agency had issued an extreme flood warning, as models showed that storms would send rivers surging to levels that had not been seen in hundreds of years.
The warnings, however, did little good.
Though Germany’s flood warning system, a network of sensors that measure river levels, functioned as it was supposed to, state and local officials said the amount of rain was unlike anything they had ever seen, causing even small streams and rivers to flood their banks.
Survivors and officials said many areas were caught unprepared as normally placid brooks and streams turned into torrents that swept away cars, houses and bridges. About 15,000 police officers, soldiers and emergency service workers have been deployed in Germany to help with the search and rescue.
Dr. Linda Speight, a hydrometeorologist at the University of Reading in Britain who studies how flooding occurs, blamed poor communication about the high risk posed by the flooding as contributing to the significant loss of life. “There should not have been so many deaths from this event,” she said.