upsurge

"There was a dramatic upsurge in tourism during the summer."

"The upsurge of interest in renewable energy has led to new innovations."

"An upsurge in cases prompted health officials to issue warnings."

"The stock prices surged after the announcement of the merger."

"Public support for the initiative surged following the recent crisis."

"After the launch of the new product, sales surged unexpectedly."