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Extreme precipitation; WRF; WSM6 and P3 microphysics; 3D-Var; Himalaya

A localized extreme precipitation event occurred over Munsiyari (Uttarakhand, India) on 2nd July 2018 causing Cash floods, landslides and damage to the hydropower project. A preliminary study has been carried out by using Weather Research and Forecasting (WRF) model with three-dimensional variation data assimilation technique (3DVAR) to examine the feasibility of the model to predict the localized phenomena. Sensitivity experiments were carried out with two different microphysics in the model. Results show that P3 1-category plus double moment cloud water microphysics scheme with 3DVAR in WRF simulates the quantity of precipitation closer to the observed precipitation over Munsiyari. The vertical velocity and relative humidity were also simulated well during 3DVAR data assimilation as compared to without data assimilation over study region.

N NARASIMHA RAO¹ M S SHEKHAR¹ G P SINGH²

1. Snow and Avalanche Study Establishment (DRDO), Chandigarh, India.
2. Department of Geophysics, Institute of Science, Banaras Hindu University, Varanasi, India.

Published

10 January 2020

Manuscript received

1 September 2019

Manuscript revised

6 November 2019

Accepted

13 November 2019

Early published

Unedited version published online

Final version published online

30 December 2019