This page was last updated on 03 September 2010 09:19
 

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General Weather Situation over the Lower Mekong Basin (LMB)
03 September 2010

General Condition

On September 03, 2010 at 1:00 am Local Cambodia Time (LCT), the latitude from 5⁰N to 25⁰N and the longitude from 90⁰E to 125⁰E, the Inter Tropical Convergence Zone (ITCZ) lies across the LMB, Myanmar, Thailand and the middle of Indochina Peninsular. The rather strong southwest monsoon prevails over the Andaman Sea, Gulf of Thailand, Thailand, Cambodia and Viet Nam. The Southwesterly wind is observed over Myanmar, Thailand and Indochina Peninsular (Figure 1).

During September 03–04, the rather strong southwest monsoon will prevail over the Andaman Sea, Gulf of Thailand, Thailand, Viet Nam and Cambodia. From moderate thundershowers to heavy showers will be more likely occurring in Thailand, Lao PDR, Cambodia and Viet Nam during this period. The Southwesterly winds will be observed over Myanmar, Thailand and Indochina Peninsula.

Figure 1: Weather Chart issued at 18:00 UTC on September 02, 2010

Source: Thai Meteorological Department 

Figure 2 of September 03, 2010 at 7:32 am Local Cambodia Time (LCT) shows IR image which is observed cloudy with Cirrus (Ci), Cirrocumulus (Cc), Altocumulus (Ac), Stratocumulus (Sc) and scattered Cumulonimbus Calvus (Cb cal) over the LMB, Gulf of Thailand, Myanmar, Thailand, Lao PDR, Cambodia and Viet Nam.

Figure 2: Infrared Image from MTSAT-IR, September 03 at 00:32 UTC

Source: Singapore Meteorology Service  

The active trough of low pressure lies across the whole LMB, Thailand, Lao PDR, Cambodia and Viet Nam. The Southwesterly winds are observed over Myanmar, Thailand and Indochina Peninsula at 1.00 am (LTC) on 03 September, 2010 (Figure3).  

Figure 3: Upper Air Weather Chart 850 hPa (1500 m), issued at 18:00 UTC on September 02, 2010

Source: Thai Meteorological Department    

The below prognosticative maps show weather by Operational Regional Spectral Model (ORSM) 6 km resolution on September 03, 2010, there might be cloudy over the LMB, Myanmar, Thailand, Lao PDR, Cambodia and Viet Nam.

During September 03-04, 2010, rains will occur mostly in the Mekong Delta, Northeastern Thailand, Northwestern Cambodia and Central Lao PDR and Viet Nam (Figure 4).

Figure 4: The prognosticative maps, ORSM issued at 12:00 UTC on  September 02, 2010 for 48 hrs forecast

Source: Hong Kong Observatory

Conclusion: Normal Weather Situation
 

The Inter Tropical Convergence Zone (ITCZ) lies across the LMB, Myanmar and the middle of Indochina Peninsular. The rather strong southwest monsoon prevails over Andaman Sea, Gulf of Thailand, Thailand, Cambodia and Southern Viet Nam at the surface. The active trough of low pressure lies across the LMB, Myanmar, Thailand, Lao PDR, Cambodia and Viet Nam at the height of 1.5 km (850 hPa). The southwesterly winds prevail over Myanmar, Thailand and Indochina Peninsula.

On September 03-04, 2010, the rather strong southwest monsoon will continue prevailing over Andaman Sea, Gulf of Thailand, Thailand, Cambodia and Southern Viet Nam. The Inter Tropical Convergence Zone (ITCZ) will lie across the LMB, Myanmar, Thailand and the middle of Indochina Peninsular. The Southwesterly wind will be observed over Myanmar, Thailand and Indochina Peninsular.

As the result of these phenomena it will bring from moderate thundershowers to heavy showers in more areas of the LMB, Myanmar, Thailand, Lao PDR Cambodia and Viet Nam, particularly in the Mekong Delta, Northeastern Thailand, Northwestern Cambodia and Central Lao PDR and Viet Nam during 03-04 September 2010.

Note: This bulletin is published by Department of Meteorology in collaboration with the MRC’s Regional Flood Management and Mitigation Center, Phnom Penh City, Cambodia.