China's meteorological authorities on Tuesday upgraded its typhoon alert from yellow to orange, the second-highest in its four-tier system, as two typhoons are expected to make landfall in the country in the coming days.

Typhoon Narra, the 19th typhoon of the year, is forecast to land in China between late Tuesday night and Wednesday, while Typhoon Saudel, this year's 18th typhoon, may hit the Chinese coast between late Thursday night and Friday morning, according to the National Meteorological Center (NMC).

As of 10 am Tuesday, Narra was located over the Beibu Gulf about 65 km west-northwest of Dongfang city in South China's Hainan province.

The NMC expected Narra to move slowly northeastward at a speed of 5 to 10 km/h, skimming the northwest coast of Hainan before hitting the coast between southeastern part of South China's Guangxi Zhuang autonomous region and the western Leizhou Peninsula in Guangdong province. It will weaken quickly after landfall, the center said.

Guangxi faced its most severe flooding in decades, with 14 rivers at 20 hydrological stations surpassing warning levels by between 0.37 and 7.69 meters. The Mingjiang River recorded its highest flood peak since records began in 1953, surging 6.69 meters above the warning level, while the Zuojiang River saw its highest levels since 1986.

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Meanwhile, Typhoon Saudel was located over the northwest Pacific Ocean about 920 km east of Taipei, China's Taiwan region, as of 11 am Tuesday. The NMC said it is likely to enter the East China Sea on Wednesday morning before making landfall along the coast from central Zhejiang to central Fujian.

From 2 pm Tuesday to 2 pm Wednesday, parts of Fujian, Jiangxi, Guangdong and Hainan are expected to see torrential rain, with some areas receiving exceptionally heavy rainfall, said the NMC.

Zhejiang province upgraded its maritime typhoon emergency response to Level IV, with coastal areas expecting strong gales. Forecasters warned of torrential rain across southern Zhejiang till Friday.

READ MORE: China maintains orange alerts for torrential rain, geological disasters

Typhoon Gaenari, the 20th typhoon of the year, made landfall along the coast of Quanzhou in Fujian at around 12:30 pm on Monday.

China's Ministry of Water Resources on Monday activated a Level-IV emergency response to flooding in Fujian and sent a work team to assist local disaster relief efforts, as Typhoon Gaenari brought heavy rainfall and could cause water levels to rise in several rivers from Monday to Tuesday.

Four rivers in Fujian exceeded alert and safety levels due to heavy rainfall from Typhoon Gaenari, according to the provincial hydrology center. The province maintained its Level III flood control emergency response as forecasters warned of continued downpours, with some areas bracing for up to 300 millimeters of rain in 24 hours.

In northern China, Hebei province activated a Level III emergency response for major meteorological disasters as heavy rainstorms swept across the region, with the provincial meteorological observatory issuing an orange alert for downpours. The provincial flood control headquarters separately launched a Level IV emergency response covering 10 cities.  

Beijing has activated a Level III flood control emergency response as the capital experiences significant rainfall.