Flooding Rainfall for Vietnam, Indochina

By Eric Leister, Meteorologist
November 16, 2013; 3:18 AM
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Play video The above video details the weather across Asia.

Tropical Depression 32W moved into Vietnam Thursday.

Despite weakening 32W has produced very heavy rainfall across Vietnam. An astonishing 449mm (17.67 inches) of rain has fallen in Hue since Thursday. Da Nang has reported more than 180mm (7 inches).

It is interesting to note the locations with the heaviest rain were well north of the center of Tropical Depression 32W. This shows that the center of a weak tropical cyclone is not important with regards to impact. This is obviously not the case with a typhoon or super typhoon.

The threat of heavy rainfall will continue for the next few days as the rainstorm moves to the west.

This tropical rainstorm passed over the typhoon-ravaged Philippines Tuesday and Wednesday, slowing the recovery and relief efforts from Super Typhoon Haiyan. Rainfall averaged (25-75 mm) over the southern and central Philippines from this system with local amounts up to 150 mm (6 inches).

Despite moving westward away from Vietnam, lingering moisture and a strong onshore flow will continue to produce locally heavy rainfall even as the rainstorm moves further away.

Rounds of moderate to heavy rain will total 50-100 mm (2-4 inches from southern Vietnam into southern Thailand, including Bangkok. Heavier rainfall will average 100-200 mm (4-8 inches) near Hue and upslope areas of central Vietnam with local amounts in excess of 300 mm (12 inches).

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Even though this rainstorm will remain south of the path Haiyan took to Ha Noi and into southern China, flooding remains a threat. Many tropical systems have already impacted this area in November, leaving the ground quite saturated.

Luckily, the minimal strength of this rainstorm will limit the threat for any damaging winds across the region.

Meteorologists Courtney Spamer and Dave Samuhel contributed to this story.

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