WASHINGTON — Federal Reserve Chair Jerome Powell bluntly warned in a speech last month that the Fed’s drive to curb inflation by aggressively raising interest rates would “bring some pain.” On Wednesday, Americans may get a better sense of how much pain could be in store.

The Fed is expected at its latest meeting to raise its key short-term rate by a substantial three-quarters of a point for the third consecutive time. Another hike that large would lift its benchmark rate — which affects many consumer and business loans — to a range of 3% to 3.25%, the highest level in 14 years.

In a further sign of the Fed’s deepening concern about inflation, it will also likely signal that it plans to raise rates much higher by year’s end than it had forecast three months ago — and to keep them higher for a longer period.

Economists expect Fed officials to forecast that their key rate could go as high as 4% by the end of this year. They’re also likely to signal additional increases in 2023, perhaps to as high as roughly 4.5%.

Short-term rates at that level would make a recession likelier next year by sharply raising the cost of mortgages, car loans and business loans. The Fed intends those higher borrowing costs to slow growth by cooling off a still-robust job market to cap wage growth and other inflation pressures. Yet the risk is growing that the Fed may weaken the economy so much as to cause a downturn that would produce job losses.

The U.S. economy hasn’t seen rates as high as the Fed is projecting since before the 2008 financial crisis. Last week, the average fixed mortgage rate topped 6%, its highest point in 14 years. Credit card borrowing costs have reached their highest level since 1996, according to Bankrate.com.

Powell and other Fed officials still say the Fed’s goal is to achieve a so-called “soft landing,” by which they would slow growth enough to tame inflation but not so much as to trigger a recession.

By last week, though, that goal appeared further out of reach after the government reported that inflation over the past year was a painful 8.3%. Even worse, so-called core prices, which exclude the volatile food and energy categories, rose much faster than expected.

The inflation report also documented just how broadly inflation has spread through the economy, complicating the the Fed’s anti-inflation efforts. Inflation now appears increasingly fueled by higher wages and by consumers’ steady desire to spend and less by the supply shortages that had bedeviled the economy during the pandemic recession.

“They’re going try to avoid recession,” said William Dudley, formerly the president of the Federal Reserve Bank of New York. “They’re going to try to achieve a soft landing. The problem is that the room to do that is virtually non-existent at this point.”

At a news conference he will give Wednesday after the Fed meeting ends, Powell isn’t likely to drop any hints that the central bank will ease up on its credit tightening campaign. Most economists expect the Fed to stop raising rates in early 2023. But for now, they expect Powell to reinforce his hard-line anti-inflation stance.

“It’s going to end up being a hard landing,” said Kathy Bostjancic, an economist at Oxford Economics.

“He’s not going to say that,” Bostjancic said. But, referring to the most recent Fed meeting in July, when Powell raised hopes for an eventual pullback on rate hikes, she added: “He also wants to make sure that the markets don’t come away and rally. That’s what happened last time.”

Indeed, investors responded then by bidding up stock prices and buying bonds, which lowered rates on securities like the benchmark the 10-year Treasury. Higher stock prices and lower bond yields generally boost the economy — the opposite of what the Fed wants.

At a previous news conference in June, Powell had noted that a three-quarter-point rate hike was “an unusually large one” and suggested that “I do not expect moves of this size to be common.” Yet after the alarming August inflation report, the Fed now seems all but sure to announce its third consecutive such increase. A fourth such hike is possible, too, if future measures of inflation don’t improve.

The central bank has already engaged in the fastest series of interest rate hikes since the early 1980s. Yet some economists — and some Fed officials — argue that they have yet to raise rates to a level that would actually restrict borrowing and spending and slow growth.

Loretta Mester, president of the Cleveland Federal Reserve Bank, and one of the 12 officials who will vote on the Fed’s decision this week, said she thinks it will be necessary to raise the Fed’s rate to “somewhat above 4% by early next year and hold it there.”

“I do not anticipate the Fed cutting” rates next year, Mester added, dispelling the expectations of many investors on Wall Street who had hoped for such a reversal. Comments like Mester’s contributed to a sharp fall in stock prices last month that began after Powell’s stern anti-inflation speech at an economic conference in Jackson Hole, Wyoming.

“Our responsibility to deliver price stability is unconditional,” Powell said then — a remark widely interpreted to mean that the Fed will fight inflation even if it requires deep job losses and a recession.

Many economists sound convinced that a recession and widespread layoffs will be necessary to slow rising prices. Research published earlier this month under the auspices of the Brookings Institution concluded that unemployment might have to go as high as 7.5% to get inflation back to the Fed’s 2% target.

Only a downturn that harsh would reduce wage growth and consumer spending enough to cool inflation, according to the a paper by Johns Hopkins University economist Laurence Ball and two economists at the International Monetary Fund.