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Relationship between atmospheric conditions at Dhaka, Bangladesh, and rainfall at Cherrapunjee, India

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  • Fumie Murata
  • Toru Terao
  • Taiichi Hayashi
  • Haruhisa Asada
  • Jun Matsumoto

Abstract

To improve flood forecasting, the understanding of the atmospheric conditions associated with severe rainfall is crucial. We analysed the atmospheric conditions at Dhaka, Bangladesh, using upper-air soundings. We then compared these conditions with daily rainfall variations at Cherrapunjee, India, which is a main source of floodwater to Bangladesh, and a representative sample of exceptionally heavy rainfall events. The analysis focussed on June and July 2004. June and July are the heaviest rainfall months of the year at Cherrapunjee. July 2004 had the fourth-heaviest monthly rainfall of the past 31 years, and severe floods occurred in Bangladesh. Active rainfall periods at Cherrapunjee corresponded to “breaks” in the Indian monsoon. The monsoon trough was located over the Himalayan foothills, and strong westerly winds dominated up to 7 km at Dhaka. Near-surface wind below 1 km had southerly components, and the wind profile had an Ekman spiral structure. The results suggest that rainfall at Cherrapunjee strongly depends on the near-surface wind speed and wind direction at Dhaka. Lifting of the near-surface southerly airflow by the Meghalaya Plateau is considered to be the main contributor to severe rainfall at Cherrapunjee. High convective available potential energy (CAPE) also contributes to intense rainfall. Copyright Springer Science+Business Media, Inc. 2008

Suggested Citation

  • Fumie Murata & Toru Terao & Taiichi Hayashi & Haruhisa Asada & Jun Matsumoto, 2008. "Relationship between atmospheric conditions at Dhaka, Bangladesh, and rainfall at Cherrapunjee, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 44(3), pages 399-410, March.
    • Handle: RePEc:spr:nathaz:v:44:y:2008:i:3:p:399-410
    DOI: 10.1007/s11069-007-9125-2
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    References listed on IDEAS

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    1. O. Dhar & Shobha Nandargi, 2003. "Hydrometeorological Aspects of Floods in India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 28(1), pages 1-33, January.
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