General Weather Situation over the Lower Mekong Basin (LMB)
01August 2014
General Condition:
On August 01 2014 at 01.00 am Local Cambodia Time (LCT), the latitude from 00N to 280N and
the longitude from 900E to 1250E, the trough of the low pressure cell over the Central Lao PDR
lies across Thailand, Cambodia, Lao PDR and Viet Nam while the moderate Southwest monsoon
prevails over Myanmar, the Andaman Sea, the Gulf of Thailand, Thailand and Indochina
Peninsular (Figure 1).
During August 01-03, the trough lies across Thailand, Cambodia, Lao PDR and Viet Nam. more
rain and isolated heavy rain will be likely in the Central, the South, the Southeast of Myanmar,
the West Coast, the Central and the East of Thailand, the Southwest Coast, the Central, the East,
the North and the Northeast of Cambodia, the lower Mekong Basin, the South and the Central of
Lao PD, the South and the Southeast and the North of Viet Nam during 01-03 August.
The waves height is expected about 2.0 meters high in the Andaman Sea and about 1.0-2.0 meters
high in the upper Gulf of Thailand during 01-03 August 2014.
Figure 1: Weather Chart issued at 18:00 UTC on 31 July, 2014
Source: Thai Meteorological Department
Figure 2 of August 01 2014 at 06:00 am Local Cambodia Time (LCT) shows IR image which is
observed partly cloud with the form of Cirrostratus (Cs), Altostratus (As), Altocumulus (Ac) and
Cumulonimbus (Cb) over the upper Golf of Thailand and the North of Cambodia.
Figure 2: Infrared Image, MTSAT IR, at 23.00 UTC on July 31, 2014
Source: Japan Meteorological Agency
The trough lies across Myanmar, Thailand, Lao PDR, Cambodia and Viet Nam. The
Southwesterly winds prevail over Myanmar, Thailand and Indochina Peninsular at 01.00 am
(LTC) on 01 August, 2014(Figure3)
Figure 3: Upper Air Weather Chart 850 hPa (1500 m), issued at 18:00 UTC on 31 July 2014
Source: Thai Meteorological Department
The below show interactive weather forecast maps are produced from computer models on
August, 01 2014.
During August 01-03 2014, rain will be likely in the Central, the South, the Southeast of
Myanmar, the West Coast, the Central and the East of Thailand, the Southwest Coast, the Central,
the East, the North and the Northeast of Cambodia, the lower Mekong Basin, the South and the
Central of Lao PD, the South and the Southeast and the North of Viet Nam (Figure 4).
Figure 4: The prognosticative maps issued at 18:00 UTC on July 31, 2014 for 72hrs forecast
Source: Hong Kong Observatory
Conclusion: Normal Weather Situation
The trough of the low pressure cell over the Central Lao PDR lies across Thailand, Cambodia,
Lao PDR and Viet Nam while the moderate Southwest monsoon prevails over Myanmar, the
Andaman Sea, the Gulf of Thailand, Thailand and Indochina Peninsular. The trough of low
pressure over the Tonkin Gulf lies across Myanmar, Thailand, Lao PDR, Cambodia and Viet
Nam at the height of 1.5km (850 hPa).
On August 01-03 2014, the trough lies across Thailand, Cambodia, Lao PDR and Viet Nam while
the moderate Southwest monsoon will prevail over Myanmar, the Andaman Sea, the Gulf of
Thailand, Thailand and Indochina Peninsular.
As the result of these phenomena, it will bring more rain and isolated heavy rain will be likely
in the Central, the South, the Southeast of Myanmar, the West Coast, the Central and the East
of Thailand, the Southwest Coast, the Central, the East, the North and the Northeast of
Cambodia, the lower Mekong Basin, the South and the Central of Lao PD, the South and the
Southeast and the North of Viet Nam during 01-03 August 2014.
The waves height is expected about 2.0 meters high in the Andaman Sea and about 1.0-2.0
meters high in the upper Gulf of Thailand during 01-03 August 2014.
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.