![]() The maximum rain rate observed during Typhoon Nina was 198.5 mm/hr at Linzhou, Henan, which is less than the 201.9 mm/hr at Zhengzhou on July 20, 2021. The magnitude of the disaster was revealed only in the mid-1990s. The resulting catastrophic floods killed at least 26,000 people, with some estimates as high as 240,000 killed. Henan Province’s deadliest flood disaster occurred in August 1975, when the meandering remnant of Typhoon Nina dropped 1060 mm (41.73 inches) of rain at Linzhuang in 24 hours, and 1606 mm (63.23 inches) in 72 hours, leading to a domino chain effect of 62 dam failures. ![]() T8gyzzCeXt- Minghao Zhou JHenan Province’s worst flood catastrophe: Typhoon Nina of 1975 ![]() A cluster of 50+ dBZ reflectivity remained stationary over the metro area with extremely high precipitation efficiency. Radar animation centered over #Zhengzhou between 4-5pm local time when 201.9mm of rain fell within 1 hour. A region of nearly stationary thunderstorms set up, leading to the astounding rainfall totals. The rainfall was likely increased as a result of air approaching Zhengzhou that travelled uphill into the foothills of the Tai-hang Mountains, causing extra cooling and condensation as the moist air rose upwards (upslope enhancement). The monsoon moisture, boosted by the circulations of the two typhoons, fed into an upper-level trough of low pressure passing over northern China’s Henan Province, generating intense rainfall over Zhengzhou. 1/n /AFmSZL0xSK- Minghao Zhou JMeteorology of the eventĪccording to Zhou’s analysis (see Tweet above), much of the moisture for this record extreme rainfall event was supplied by a large-scale monsoon circulation off the coast of China, which was also feeding moisture to two typhoons: Typhoon Cempaka, a category 1 storm that was making landfall southwest of Hong Kong, and Typhoon In-fa, a category 2 storm that was headed westwards toward the Chinese coast, north of Taiwan. Fortunately, the latest run of the GFS model calls for no additional heavy rains in the city in the coming week.Īrchived content: sketch of how extreme rainfall in Zhengzhou, China was related to (1) moisture transport enhanced by the monsoon gyre, (2) deepening upper-level trough, and (3) leeward inverted trough and upslope flow. Heavy rains continued into Wednesday in Zhengzhou, with the city recording a total of 787.9 mm (31.02 inches) in the 72 hours ending at 12Z July 21. This amount shattered China’s national record for highest one-hour rainfall of 168.3 mm/hr (6.63 inches/hr) for all 2,418 national weather stations in mainland China, previously set at Maoming, Guangdong. ![]() local time) was a staggering 201.9 mm/hr (7.95 inches/hr). student at SUNY Albany, the city’s maximum one-hour rainfall rate between 8 and 9Z July 20 (4-5 p.m. Both disasters have preliminary damage estimates in excess of $10 billion.Īccording to meteorologist Minghao Zhou, a Ph.D. The disaster follows on the heels of the extreme rainfall event that killed more than 200 people in Germany and Belgium last week. This is literally more than a year’s worth of rain: Its average annual precipitation (1981-2010 climatology) is only 640.9 mm (25.24 inches). Zhengzhou, a megacity of more than 10 million – and the world’s biggest manufacturing base for iPhones and a major hub for food production and heavy industry – recorded an astonishing 644.6 mm (25.38 inches) of rain in the 24 hours ending at 21Z July 20. Media requests for Jeff Masters and Bob HensonĪt least 33 people are dead and 8 missing in Zhengzhou, China, after a July 20 extreme rainfall event of nearly unimaginable intensity.
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