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This page was last updated on 03 September 2010
09:19
Notice: Please check for latest Animated MTSAT Asean Satellite Images (Source: National Environment Agency - Singapore Government) and
Current Typhoon Warning
(Source: Joint Typhoon Warning Center, U.S. Navy)
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.
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