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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 33, issue 6
Ann. Geophys., 33, 671–686, 2015
https://doi.org/10.5194/angeo-33-671-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 33, 671–686, 2015
https://doi.org/10.5194/angeo-33-671-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 03 Jun 2015

Regular paper | 03 Jun 2015

Observation- and numerical-analysis-based dynamics of the Uttarkashi cloudburst

C. Chaudhuri1, S. Tripathi1,2, R. Srivastava1, and A. Misra1 C. Chaudhuri et al.
  • 1Department of Civil Engineering, Indian Institute of Technology, Kanpur, India
  • 2Centre for Environmental Science and Engineering, Indian Institute of Technology, Kanpur, India

Abstract. A Himalayan cloudburst event, which occurred on 3 August 2012 in the Uttarkashi (30.73° N, 78.45° E) region of Uttarakhand, India, was analyzed. The near-surface atmospheric variables were analyzed to study the formation, evolution, and triggering mechanisms of this cloudburst. In order to improve upon the understanding provided by the observations, numerical simulations were performed using the Weather Research and Forecasting (WRF) model, configured with a single domain at 18 km resolution. The model was tuned using variation of different parameterizations (convective, microphysical, boundary layer, radiation, and land surface), and different model options (number of vertical levels, and spin-up time), which resulted in a combination of parameters and options that best reproduced the observed diurnal characteristics of the near-surface atmospheric variables. Our study demonstrates the ability of WRF in forecasting precipitation, and resolving synoptic-scale and mesoscale interactions. In order to better understand the cloudburst, we configured WRF with multiply nested two-way-interacting domains (18, 6, 2 km) centered on the location of interest, and simulated the event with the best configuration derived earlier. The results indicate that two mesoscale convective systems originating from Madhya Pradesh and Tibet interacted over Uttarkashi and, under orographic uplifting and in the presence of favorable moisture condition, resulted in this cloudburst event.

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In this paper a Himalayan cloudburst event is investigated. The conditions of formation, evolution, and triggering mechanisms of this cloudburst are studied, looking at varieties of observed data sets and simulation with the Weather Research and Forecasting (WRF) model. This cloudburst event is attributed to two mesoscale convective systems originating from Madhya Pradesh and Tibet which interacted over Uttarkashi, and under orographic uplifting in the presence of favorable moisture conditions.
In this paper a Himalayan cloudburst event is investigated. The conditions of formation,...
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