Fed Chairman Jay Powell’s apparently dovish speech Wednesday was arguably the single most important event for stock markets in months.

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Following the speech in which the central banker said that interest rates were “just below” the range of rates considered neutral, the Dow Jones Industrial Average soared 600 points, with both the blue-chip index and S&P 500 index notching their best single-day percentage gains since March.

“The market interpreted those comments as saying, ‘Whatever your expectations were for rate hikes next year, revise them down,’ ” said Petra Bakosova, chief operating officer of Hull Tactical Asset Allocation, in an interview with MarketWatch. “Staying in the stock market has now become more attractive.”

But if Powell’s words make stocks more attractive in the short term, they also introduce a degree of uncertainty toward future Fed policy that hasn’t been seen for several years.

“The Fed’s tone has shifted from ‘We know what the economic data is saying’ to ‘We only kind of know what the data is saying, and we may or may not want to keep raising rates,’ ” Thomas Martin, senior portfolio manager with Globalt Investments, told MarketWatch.

The Federal Reserve’s increasingly obvious lack of conviction regarding the state of the U.S. economy will likely keep volatility elevated in December and into the new year, Martin said. Meanwhile, it will only increase investors’ focus on the data they see as informing the Fed’s decision making.

“At the margin, it increases the focus on the unemployment rate, the participation rate, the wage-growth number, and unit labor costs,” Martin said, adding that this data can be “choppy” and noise-ridden, further inviting increased volatility.

Some investors are even questioning whether Powell’s speech was really even as dovish as the market seemed to conclude. Ryan Nauman, market strategist with Informa Financial Intelligence, pointed out that because the Fed’s estimated range of what constitutes a “neutral rate” is so wide, once can interpret these comments as being fully consistent with three rate hikes next year, a possibility that the market is discounting, according to fed funds futures contracts.

“When you look at the speech again, it looks like that 600-point rally was overdone,” he said.

Uncertainty over Fed policy is also dovetailing with growing concerns about the sustainability of the current economic expansion to help contribute to a steady climb in volatilityin recent weeks, trends that show no signs of abating.

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