WASHINGTON — The U.S. economy likely gained more momentum in the spring than the government previously estimated. The question now is whether shrunken global stock markets and a sharp slowdown in China will weaken the economy in coming months.

The Commerce Department today will update its estimate of the economy’s growth, as measured by the gross domestic product, for the April-June quarter.

A month ago, the government calculated that the economy grew at a 2.3 percent annual rate last quarter. That figure marked a rebound from the January-March quarter, when growth slowed to an anemic 0.6 percent rate, mainly because of a severe winter and other temporary factors.

Economists surveyed by data firm FactSet have forecast that the government will now estimate that the economy expanded at a stronger 3 percent annual rate last quarter.