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Member Report MEMBER REPORT ESCAP/WMO Typhoon Committee 42st Session 25-29 January 2010 Singapore (SOCIALIST REPUBLIC OF VIET NAM) 1 CONTENTS page I. Overview of tropical cyclones which have affected/impacted 3-19 Member’s area since the last Typhoon Committee Session II. Summary of progress in Key Result Areas 19-30 1. Progress on Key Result Area 1 2. Progress on Key Result Area 2 3. Progress on Key Result Area 3 4. Progress on Key Result Area 5 5. Progress on Key Result Area 6 6. Progress on Key Result Area 7 III. Resource Mobilization Activities 30 IV. Update of Members’ Working Groups representatives 30-31 2 I. Overview of tropical cyclones which have affected/impacted Member’s area in 2009 1. Meteorological Assessment (highlighting forecasting issues/impacts) The meteorological conditions in Vietnam during 2009 were extreme with 5 tropical storms. Those are TS No. 4 (SOUDELOR – 0905), TS No. 7 (MUJIGAE – 0913), TS No. 9 (KETSANA – 0916), TS No.10 (PARMA – 0917), TS No. 11 (MIRINAE – 0921). Besides that, tropical depression formed in South South China Sea in 3rd September, 2009, did not make landfall in Vietnam but its circulation, incorporating with strong South West monsoon, caused heavy rainfall for central part of Vietnam. Total rainfall for 6 days is 500 – 700mm in general, especially more than 1000mm in Thua Thien Hue (1022mm), Da Nang (1239mm). TS No 4 (SOUDELOR – 0905) was upgraded from tropical depression over North South China Sea. At 06 UTC of 11th July, its locations was 20.1N – 114.1E with maximum wind speed of force 8, gust 9, 10. SOUDELOR entered Bacbo gulf and made landfall on Quang Ninh – Hai Phong provinces. This is not strong tropical cyclone with maximum wind speed recorded at Bach Long Vi station is 11m/s, gust 13m/s, Co To 15m/s, gust 22m/s, Mong Cai (Quang Ninh) 12m/s, gust 16m/s, Bai Chay (Quang Ninh) 13m/s, gust 17m/s. Minimum pressure was recorded of 994,3 mb at 10UTC 12th July, 2009 at Hon Dau station. SOUDELOR caused heavy rain for North Vietnam, total in 2 days (12th and 13th July) is 100mm in general, some stations get more such as: Moc Chau (Son La) 211mm, Nam Dinh 166mm, Hoi Xuan (Thanh Hoa) 175mm. Figure 1. Tropical Storm SOUDELOR in July 2009 3 TS No 7 (MUJIGAE – 0913) was upgraded from tropical depression over North South China Sea. At 21 UTC of 09th September, its locations was 18.6N – 115.9E with maximum wind speed of force 8, gust 9, 10, moving WNW at 25km/h. After entering Bacbo gulf, MUJIGAE slowed down at 10km/h, then made landfall on Nam Dinh – Thanh Hoa provinces on 12th September morning. Maximum wind speed recorded at Bach Long Vi station is 20m/s, gust 27m/s, Co To 18m/s, gust 24m/s, Hon Dau 13m/s, gust 21m/s, Van Ly (Nam Dinh) 18m/s, gust 21m/s. Minimum pressure was recorded of 994,6 mb at 08.30UTC 11th September, 2009 at Bach Long Vi station. MUJIGAE did not cause really heavy rain for North Vietnam, total in 3 days (11th and 13th September) is 30- 80mm in general, some provinces got more such as: Hoa Binh 180mm, Nam Dinh 159mm, Ninh Binh 231mm, Thanh Hoa 263mm. Figure 2. Tropical Storm MUJIGAE in September 2009 TS No 9 (KETSANA – 0916) was upgraded from tropical depression over East Phillippine Sea. At 00 UTC of 26th September, its locations was 15.4N – 122.7E with maximum wind speed of force 8, gust 9, 10, moving Westward at 25km/h and intensified rapidly. After entering South China Sea, KETSANA continued to move West-ward at 20 - 25km/h, when KETSANA approached Hoang Sa archipelago, it reached maximum intensity of 13 beaufort scale, gust 14, 15. After crossing Hoang Sa archipelago, KETSANA continued its west-ward and slightly change its direction before making landfall on Quang Nam – Quang Ngai provinces on 29th September afternoon. Maximum wind speed recorded at Ly Son station is 32m/s, gust 43m/s, Con Co 17m/s, gust 24m/s, Da Nang 22m/s, gust 30m/s, Tam Ky (Quang Nam) 16m/s, gust 29m/s, Quang Ngai 16m/s, gust 22m/s. Minimum pressure was recorded of 964,7 mb at 05.30UTC 29th September, 2009 at Ly Son station. KETSANA did cause really heavy rain for Central 4 Vietnam (includes provinces from Quang Binh to Quang Ngai, Gia Lai, KonTum, total rainfall in 3 days (28th and 30th September) is 120-270mm in Quang Binh; 200 – 400mm in Gia Lai, Kon Tum, and Quang Tri to Quang Ngai; 400 – 600mm for provinces from Thua Thien Hue to Quang Ngai. Some provinces got more rainfall such as: Nam Dong (Thua Thien Hue) 884mm, Tra Bong (Quang Nam) 914mm… KETSANA also caused historic flood in some rivers in central Vietnam. Figure 3. Tropical Storm KETSANA in September 2009 TS No 10 (PARMA – 0917) was upgraded from tropical depression over North West Pacific. At 12 UTC of 12th October, its locations was 10.0N – 146.0E. After entering South China Sea on 4th October morning, PARMA moved NNW, then WNW. At 00UTC, 5th November, PARMA was at 20,1N – 119,3E with maximum intensity of 10 beaufort scale. Since then, because of interaction with typhoon MELOR, TS. PARMA is almost stationary, moving ESE and then SE, going out of South China Sea. After crossing 1220E longtitude, PARMA came back, crossed Luzon once more and entered South China Sea on 9th October morning. Before entering Bacbo gulf, slightly intensifying and then dissipating over coastal area of Thai Binh – Nam Dinh provinces, PARMA moved Westward and NorthWestward with unstable speed. This is one of the most complicated- track-typhoon in 2009 over South China Sea. Although PARMA did not make landfall with tropical cyclone or tropical depression intensity, PARMA caused damage wind over Bacbo gulf, maximum wind speed of 42m/s, gust 53m/s for Bach Long Vi station; 18m/s, gust 30m/s for Co To station. For coastal area, PARMA also brought 18m/s, gust 24m/s for Cua Ong station; 12m/s, gust 16m/s for Mong Cai station. Minimum pressure of 989,0 mb was recorded at 08.15UTC 13th October, 2009 in Bach Long Vi station. PARMA 5 caused heavy rain for Quang Ninh – Hai Phong provinces, total rainfall in 3 days (13th and 15th October) is 100 - 150mm, some stations got more such as: Mong Cai (Quang Ninh) 181mm, Bach Long Vi 193mm, Co To 317mm, Thanh Hoa 179mm... Figure 4. Tropical Storm PARMA in October 2009 TS No 11 (MIRINAE – 0921) was formed over North West Pacific. 31st October, MIRINAE crossed Luzon island, entering South China Sea. This is 10th Tropical Cyclone over South China Sea in 2009. MIRINAE moving mostly steady to the West at 20 - 25km/h and reaching its maximum intensity of 11 beaufort scale. When MIRINAE is 250km away from Binh Dinh – Khanh Hoa coastline, it turned to South-West before making landfall on Phu Yen – Khanh Hoa provinces on 2nd November. Maximum wind speed recorded at Ly Son station is 20m/s, gust 25m/s, Tuy Hoa 19m/s, gust 33m/s, Quy Nhon 17m/s, gust 28m/s, Nha Trang 12m/s, gust 22m/s. Minimum pressure of 989,5 mb was recorded at 07.30UTC 2nd October, 2009 at Tuy Hoa station. MIRINAE caused heavy rain for South Vietnam (includes provinces from Quang Ngai to Khanh Hoa, Gia Lai), total rainfall in 2 days (2nd and 3rd November) is 200 - 300mm. Some provinces got more rainfall such as: A Luoi (Thua Thien Hue) 377mm, Tra My (Quang Nam) 391mm, Van Canh (Binh Dinh) 666mm, Quy Nhon (Binh Dinh) 368mm, Van Ninh (Khanh Hoa) 355mm… 6 Figure 5. Tropical Storm MARINAE in October-November 2009 2. Hydrological Assessment (highlighting water-related issues/impact) During the period from 1 January to 30 November 2009, due to the affects of some tropical cyclones, 9 serious floods was occurred in main rivers in Vietnam in which two historical flood events were occurred in rivers in Central, highland and South of Vietnam. a) In the North: During flood season of 2008, in some rivers in the North Vietnam occurred heavy rains and historical flood . -In middle of May (11-18), due to affect of Western edge of high pressure area in combination with activity of South East wind, the heavy rains over 90-200mm were recorded in areas of the North Vietnam. Rainfall in some places were higher such as Hoang Xu Phi: 411mm; Viet Lam: 375 mm; Nam Giang: 358 mm; Lai Chau: 317mm, Vang Po: 315 mm. Tieu Man flood (early flood) occurred in most of river with altitude from 2 to 4 m and flood peak was higher and earlier compared to the yearly average. The flood peak in Thao river at Yen Bai station was 29,13m with flood amplitude of 3.62m; in Da river at Ta Bu station was 110,23m with flood amplitude of 4,75m; in Lo river at Tuyen Quang station was 21,82 m with flood amplitude of 5,40m; and dowstream of Hong river at Hanoi station was 5,6m with flood amplitude of 3,92m. - In early July, due to affect of trough in combination with activity of wind convergence in celling, the heavy rains over 100-200mm were recorded in areas of the North Vietnam. 7 Rainfall in some places were higher than 300mm such as Muong Te: 443mm; Ban Chieng: 442mm; Ha Giang: 364mm; Bac Quang: 534 mm.
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