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05 September 2011

Asia Update #45: Nanmadol brings short-term relief to southeast China

The remnants of Typhoon Nanmodol have slightly reduced the rainfall deficit in southern China. Meanwhile south Asia continues to rebound, with areas of significant rainfall deficits restricted to greater Delhi, and northeast India. Poor rainfall in parts of southeast Asia is a growing problem as moisture has not been moving onshore from the South China Sea.
Typhoon Nanmodal soaked parts of southeastern China last week, bringing additional relief to the region. Nanmodol also made landfall in southern Taiwan, after clipping Luzon in the Philippines. The added rainfall will help improve moisture conditions, but it won't be until winter that there will be a sign of significant turnaround. If this winter, the snowpack starts building across the regions headwaters, then conditions will improve and the 2012 growing season would be closer to normal.
A lack of (preferably weak) typhoons moving into southeast Asia, from the South China Sea, has continued to allow deficits to climb across Vietnam, Cambodia and Laos. Some weak onshore flow has kept those deficits at bay thus far, but without westbound tropical systems, river levels may drop to critical levels. Elsewhere, Burma and Thailand have had a generally productive growing season with moisture abundant and flooding events kept to a minimum.
Most of India, Bangladesh and other nearby countries have recovered from earlier deficits. Only northeast India, and adjacent parts of Bangladesh and Bhutan remain seriously in the red. The area west of Delhi, mainly in Haryana has also had continuing problems with precipitation. Nepal has generally recovered from its earlier poor totals, while Pakistan has had well distributed near normal rainfall throughout the season.

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