Droughts will get drier, storms will get stormier and floods will get deeper with a warming climate across North America, U.S. government experts said in a report billed as the first continental assessment of extreme events.

Events that have seemed relatively rare will become commonplace, said the latest report from the U.S. Climate Change Science Program, a joint effort of more than a dozen government agencies.

“Heat waves and heavy downpours are very likely to further increase in frequency and intensity,” the report stated. “Substantial areas of North America are likely to have more frequent droughts of greater severity. Hurricane wind speeds, rainfall intensity and storm surge levels are likely to increase. The strongest cold season storms are likely to become more frequent, with stronger winds and more extreme wave heights.”

There has been an increase in the frequency of heavy downpours, especially over northern states, and these are likely to continue in the future, Thomas Karl, director of the National Climatic Data Center, said in a briefing Thursday.

For example, Karl said, by the end of this century rainfall amounts expected to occur every 20 years could be taking place every five years.

Such an increase “can lead to the type of events that we are seeing in the Midwest,” said Karl, though he did not directly link the current flooding to climate change.

The report itself noted that “intense precipitation (the heaviest 1 percent of daily precipitation totals) in the continental U.S. increased by 20 percent over the past century while total precipitation increased by 7 percent.”

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