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Haima was the second tropical cyclone that necessitated the issuance of a tropical cyclone warning signal by the Hong Kong Observatory in 2011.
Haima formed as a tropical depression over the western North Pacific about 420 km east of Manila on 18 June and moved generally northwestwards. It turned to move west-northwestwards across the Luzon Strait on the evening of 19 June. Haima took on a west to west-southwestward track across the northern part of the South China Sea for the following two days. It turned to move west-northwest to northwestwards at about 12 km/h on 22 June and intensified into a tropical storm, reaching its peak intensity with an estimated maximum sustained wind of 85 km/h near its centre that evening. Haima made landfall over the coast of western Guangdong about 300 km west-southwest of Hong Kong on the morning of 23 June and moved west-southwestwards skirting the coastal region of western Guangdong that afternoon. It moved across Beibu Wan on 24 June and made landfall over the northern coast of Vietnam that evening. Haima weakened into a tropical depression in the early hours of 25 June and dissipated inland over Laos that evening. According to press reports, at least 16 people were killed, four missing and 63 people injured in Vietnam during the passage of Haima.
In Hong Kong, the Standby Signal No. 1 was issued at 9:35 p.m. on 20 June when Haima was about 420 km southeast of Hong Kong. Winds in Hong Kong were light to moderate from the east that evening, becoming fresh easterlies, occasionally strong offshore and on high ground the following day. As Haima moved gradually closer to Hong Kong, the Strong Wind Signal No. 3 was issued at 5:45 a.m. on 22 June when Haima was about 330 km to the south. Winds strengthened further to become fresh to strong east to southeasterlies that day, occasionally reaching gale force offshore and on high ground. At the Hong Kong Observatory Headquarters, the lowest instantaneous mean sea-level pressure of 995.2 hPa was recorded at 4:31 p.m. that day. Haima was closest to Hong Kong at around 8 p.m. passing about 240 km to the south-southwest. Winds turned to the southeast on the small hours of 23 June and remained generally strong, reaching gale force offshore and on high ground. The winds weakened gradually in the morning as Haima moved away and the Standby Signal No. 1 was issued at 10:25 a.m. to replace the Strong Wind Signal No. 3. As Haima moved further away from Hong Kong during the afternoon, all signals were cancelled at 8:45 p.m.
The weather in Hong Kong was fine and very hot apart from a few showers on 20 June. It was mainly fine at first the following day, with a few squally showers in the afternoon. There were squally heavy showers on 22 June. A few squally showers still affected Hong Kong on 23 June, mainly in the western part of the territory.
Over 170 cases of fallen trees were reported in various parts of Hong Kong during the passage of Haima. In particular, a tree collapsed in Stubbs Road on Hong Kong Island, damaging a car and injuring one passenger. In Tsz Wan Shan, a man was injured by fallen tree branches. There were also many incidents of fallen scaffoldings and damage to curtain walls. In Wanchai, there was a report of a collapsing wall in a construction site. A sampan sank in Lam Chuen River in the New Territories. No one was injured during the incident.
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