| Abstract Submission No. | ABS-3.1-0127 |
| Title of Abstract | An analytical study of extreme precipitation events over the higher reaches of the northwest Himalayas during 1978-2023 |
| Authors | Dr Priyanka Singh*, Dr Naresh Kumar |
| Organisation | India Mereorological Department |
| Address | Room No 513, DGM Building, IMD, New Delhi Delhi, delhi, India Pincode: 110003 E-mail: cpriyanka04@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | The Himalayas plays vital role for Indian weather & climate. It controls the Western Disturbances (WDs) in winter months and easterly winds associated with summer monsoon . In the present study, a detailed analysis is carried out to understand the various meteorological features associated with it. In the present study, daily precipitation data of 08 meteorological stations located in northwest Himalayas (highest of the station > 1.5 Km) for the period 1978-2023 during summer monsoon. The extreme precipitation is considered, when a meteorological station reports daily precipitation more than 99.9 percentile in past 24 hours (which is 140 mm). There are total nine events of extreme precipitation over the northwest Himalayas i.e. (1) 09 September 1992, (2) 10 July 1993, (3) 04 September1995, (4) 22 August 1996, (5) 27 August 1997, (6) 06 July 2005, (7) 01 September 2006, (8) 04 September 2014 and (9) 22 September 2015. In general, it is observed in all the cases that there is a Low Pressure area over northwest India & neighbourhood embedded in Monsoon Trough that drags huge amount of moisture incursion over northwest India from Arabian Sea as well as from Bay of Bengal. In addition, there was an active western disturbance as a cyclonic circulation or as a deep trough in mid-tropospheric westerlies over Jammu & Kashmir. Both the synoptic scale systems interact with each over northwest Himalayas. Also, the position of Tibetan high, presence of another low pressure area/Cyclonic Circulation over northwest Bay of Bengal & adjoining Indian coastal area or/and over Arabian Sea plays very important role for enhancement of extreme precipitation activity over the northwest Himalayas. |
| Keywords | Western Disturbances, |