People ride on a waterlogged road in Zhengzhou, capital of central China's Henan Province, July 20, 2021. (PHOTO / XINHUA)

BEIJING - China's national observatory on Friday morning issued an orange alert for Typhoon In-Fa, which has become a strong typhoon and is expected to make landfall in the coastal areas between the northern parts of Zhejiang province and the northern parts of Fujian province from Sunday afternoon to early Monday morning.

Typhoon In-Fa will bring rainstorms to regions including Zhejiang, Shanghai, Jiangsu and Anhui. Strong rainfall is also expected to lash the western parts of flood-ravaged Henan province in central China on Friday, according to forecasts from the National Meteorological Center

At 11 am Friday, the center of Typhoon In-Fa, which means fireworks, was located in a coastal area approximately 640 km southeast of Xiangshan in Zhejiang province, or at a latitude of 24.5 degrees north and a longitude of 125.3 degrees east, according to the National Meteorological Center (NMC).

In-Fa, the sixth typhoon of this year, is moving northwestward at about 15 kilometers per hour and gaining strength. The center was about 650 km from Xiangshan in Zhejiang at 10 am Friday, with winds of up to 42 meters per second near the eye.

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In-Fa will bring rainstorms to regions including Zhejiang, Shanghai, Jiangsu and Anhui. Strong rainfall is also expected to lash the western parts of flood-ravaged Henan province in central China on Friday, according to forecasts from the NMC.

Torrential rain has affected about 3 million people in the province, with 56 reported dead and five still missing as of 5 pm Thursday, local authorities said.

Rescue efforts including drainage operations are still underway at Jingguang Road tunnel in the provincial capital Zhengzhou, a waterlogged underpass where many vehicles had been trapped since Tuesday, according to the provincial emergency management department.

The department said there was still a large amount of water in the tunnel, where casualties have been reported. The exact number of casualties has yet to be confirmed

READ MORE: Spirits rise as floods in China's Henan subside

China has a four-tier color-coded weather warning system, with red representing the most severe warning, followed by orange, yellow and blue.