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General Weather Situation over Lower Mekong Basin
15-21 March 2010

General Condition:

On March 15, 2010 at 9:00 am Local Cambodia Time (LCT), the latitude from 0^o N to 40^o N and the longitude from 85^o N to 140^o E, the heat low pressure, with its central pressure 1008 hPa, is observed over Myanmar, Thailand, Lao PDR and Northern Viet Nam. The ridge pressure is observed over Hainan Island, Hong Kong, Southern Viet Nam and Cambodia (Figure 1).  The Easterly and Southeasterly wind is observed over Indochina Peninsula.

On March 16-21, 2010 the ridge pressure is still observe over Myanmar, Thailand, Lao PDR, Viet Nam and Cambodia. The heat low pressure will be observed over Southern Thailand, Southern Viet Nam and Northwestern Cambodia. The Easterly and Southeasterly wind is still observed over Indochina Peninsula.

Figure 1:  Weather chart issued at 18:00 UTC on March 14, 2010.

Source:    TMD.

On March 15, 2010, the anti-cyclone is observed over Philippine, South China Sea, Viet Nam, Lao PDR, Thailand, Myanmar and Cambodia (Figure 2). The Easterly and Southeasterly wind is observed over Indochina Peninsula.

On March 16-21, 2010, the anti-cyclone is still observed over South China Sea, Viet Nam, Lao PDR, Thailand, Myanmar and Cambodia. The Easterly and Southeasterly wind will be observed over Indochina Peninsula.

Figure 2:  Upper Air Stream line Chart 850 hPa (1500m), issued at 18:00 UTC on March 14, 2010.

Source: TMD.

Figure 3 is Prognosticative map showing Probability Precipitation (PP) by EPS-36 model, 60 km resolution. On March 15, 2010 there may be a scattered of Cirrus (Ci) and Cumulus (Cu) clouds developed over Myanmar, Thailand, Lao PDR, Northern Cambodia and Northern Viet Nam.

On March 16-21, 2010, the hot weather, increase temperature and hazy will occur in Myanmar, Thailand, Lao PDR, Viet Nam and Cambodia. The scattered/summer thundershower may occur over Myanmar, Thailand, Lao PDR, Viet Nam and Cambodia in some areas.

Figure 3:  Prognosticative Map issued at 12:00 UTC on March 14, 2010,

Source:  Hong Kong.

Conclusion:

Normal Weather Situation:

The heat low pressure, with its central pressure 1008 hPa, is observed over Myanmar, Thailand, Lao PDR and Northern Viet Nam. The ridge pressure is observed over Hainan Island, Hong Kong, Southern Viet Nam and Cambodia.  The Easterly and Southeasterly wind is observed over Indochina Peninsula. The anti-cyclone is observed over Philippine, South China Sea, Viet Nam, Lao PDR, Thailand, Myanmar and Cambodia, at the high level 5 km (850 hPa high).

On March 16-21, 2010 the ridge pressure is still observe over Myanmar, Thailand, Lao PDR, Viet Nam and Cambodia. The heat low pressure will be observed over Southern Thailand, Southern Viet Nam and Northwestern Cambodia. The Easterly and Southeasterly wind is still observed over Indochina Peninsula. The anti-cyclone is still observed over South China Sea, Viet Nam, Lao PDR, Thailand, Myanmar and Cambodia, at the high level 1.5 km (850 hPa high). As the result of these phenomena, the hot weather, increase temperature and hazy will occur in Myanmar, Thailand, Lao PDR, Viet Nam and Cambodia. The scattered/summer thundershower may occur over Myanmar, Thailand, Lao PDR, Viet Nam and Cambodia in some areas.

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