On the dynamics of an extreme rainfall event in northern India in 2013

Xavier, Anu; Manoj, M. G.; Mohankumar, K.

doi:10.1007/s12040-018-0931-6

Cited by 10 publications

(9 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fact that El Niño-Southern Oscillation (ENSO) was in a La Niña phase may have also led to stronger westerly winds over the Bay of Bengal and the Indian subcontinent. Analysis of the U flood in June 2013 showed that a similar mechanism caused the heavy precipitation events seen between the 14-17 June [28][29][30][31][32][33][34][35]. The north-westward extent of the monsoon was much further along, compared to normal, in mid June.…”

Section: Gauges -Brahmaputramentioning

confidence: 99%

Water Pathways for the Hindu-Kush-Himalaya and an Analysis of Three Flood Events

Boschi¹,

Lucarini

2019

Atmosphere

View full text Add to dashboard Cite

The climatology of major sources and pathways of moisture for three locales along the Hindu-Kush-Himalayan region are examined, by use of Lagrangian methods applied to the ERA-Interim dataset, over the period from 1980 to 2016 for both summer (JJA) and winter (NDJ) periods. We also investigate the major flooding events of 2010, 2013, and 2017 in Pakistan, Uttarakhand, and Kathmandu, respectively, and analyse a subset of the climatology associated with the 20 most significant rainfall events over each region of interest. A comparison is made between the climatology and extreme events, in the three regions of interest, during the summer monsoon period. For Northern Pakistan and Uttarakhand, the Indus basin plays the largest role in moisture uptake. Moisture is also gathered from Eastern Europe and Russia. Extreme events display an increased influence of sub-tropical weather systems, which manifest themselves through low-level moisture transport; predominantly from the Arabian sea and along the Gangetic plain. In the Kathmandu region, it is found that the major moisture sources come from the Gangetic plain, Arabian Sea, Red Sea, Bay of Bengal, and the Indus basin. In this case, extreme event pathways largely match those of the climatology, although an increased number of parcels originate from the western end of the Gangetic plain. These results provide insights into the rather significant influence of mid-latitudinal weather systems, even during the monsoon season, in defining the climatology of the Hindu-Kush-Himalaya region, as well as how extreme precipitation events in this region represent atypical moisture pathways. We propose a detailed investigation of how such water pathways are represented in climate models for the present climate conditions and in future climate scenarios, as this may be extremely relevant for understanding the impacts of climate change on the cryosphere and hydrosphere of the region.

show abstract

Section: Gauges -Brahmaputramentioning

confidence: 99%

Water Pathways for the Hindu-Kush-Himalaya and an Analysis of Three Flood Events

Boschi¹,

Lucarini

2019

Atmosphere

View full text Add to dashboard Cite

show abstract

“…There are significant differences in LLJ spatial structure and had a broader LLJ during extreme event compared before and after the event (Figure 9). There have been many studies on heavy rainfall associated with increasing the low-level winds over different parts of world (e.g., Chen and Li 1995;Takahasi 2004;Lima et al 2009;Priya et al 2017;Velloer et al 2016;Xavier et al 2018) as observed in the present case.…”

Section: Role Of Background Dynamics For the Observed Extreme Precipitation Eventmentioning

confidence: 52%

“…It is also noticed from Figure 8, that the maximum CAPE value observed just three days priors to the day of extreme precipitation. Recently, Xavier et al (2018) observed the similar changes of CAPE during the Uttarakhand heavy rainfall event in June 2013. We have carried analysis for three periods such as before (1 st -7 th August), during (12 th -18 th August) and after (25 th -31 st August) the extreme precipitation event as shown figures 9 & 10 for LLJ and TEJ.…”

Section: Role Of Background Dynamics For the Observed Extreme Precipitation Eventmentioning

confidence: 57%

“…severe convective system to occur, which includes a high amount of convective available potential energy (CAPE), steady supply of moisture, wind shear and low-level convergences. The Indian monsoon is characterized by moist convective instability with relatively high amount of CAPE (Xavier et al 2018). Figure 8 shows that the daily variation of CAPE, which suggest that prior to occurrence of extreme precipitation, large CAPE values observed and helps to the initiate the vigorous convection during extreme precipitation.…”

Section: Role Of Background Dynamics For the Observed Extreme Precipitation Eventmentioning

confidence: 94%

See 1 more Smart Citation

Spatial and vertical structure of precipitating clouds and the role of background dynamics during extreme precipitation event as observed by C-band Polarimetric Doppler Weather Radar at Thumba (8.50° N, 77.00° E)

Subrahmanyam

Kumar

2020

Preprint

View full text Add to dashboard Cite

Abstract. Extreme precipitation events have been cynosure for many meteorologists as well as for common men as it causes severe weather hazards and affects the densely populated regions, especially urban cities. It is now well known that these extreme events have been increasing over the Indian region during the past few years. It becomes very important to understand and assess these events, which is challenging in terms of limited observations. Very recently, the state of Kerala, India experienced extreme rainfall events during August 2018 and led to major flooding, which is regarded as one of the worst natural disasters experienced by Kerala in the last hundred years. This catastrophic event occurred during 12th to 17th August 2018 in which the Kerala state has received 60 % more rainfall than the normal during this period. The present study focuses on investigating the spatial and vertical structure of precipitating clouds and their microphysical properties during this extreme precipitation event using C-band Polarimetric Doppler Weather Radar (DWR) observations over Thumba (8.50° N, 77.00° E). The DWR analyses were carried out during episodes of extreme rainfall, and the time evolution of radar reflectivity structure is examined very closely to understand the structure and dynamics of this unprecedented event. The spatial and vertical structures of precipitating clouds are strongly linked with the background dynamics. Apart from the DWR observations, prevailing dynamics such as tropical easterly jet (TEJ), low-level jet (LLJ) along with vertical velocity also investigated, which showed distant signatures lead to the extreme event. It was observed that the upper level divergence existed associated with low level convergence, which aids to the development of convection. The westward equatorial waves were present in the period of 7–10 days throughout the month of August 2018. The weakening of TEJ at upper troposphere resulted in decrease of vertical shear, which favours the vertical growth of convective clouds leading to the extreme precipitation. The enhanced strength of LLJ is also contributed to the precipitation extreme. Thus, the significance of the present study lies in delineating the structure and dynamics of the extreme precipitation event using indigenously developed DWR.

show abstract

“…Responsible Editor: A.-P. Dimri. period has been in the focal point of many recent scientific investigations (see Dobhal et al 2013;Ray et al 2014;Kotal et al 2014;Joseph et al 2015;Shekhar et al 2015;Sikka et al 2015;Vellore et al 2016;Chevutri and Dimri 2016;Ranalkar et al 2016a, b;Rajesh et al 2016;Kumar et al 2016;Houze et al 2017;Krishnamurti et al 2017;Parida et al 2017;Xavier et al 2018). These investigations generally concur with the presence of anomalous largescale extratropical circulation and its interaction with ISM circulation during the period of extreme rains over the WH region.…”

Section: For the Location) During The 15-18 June 2013mentioning

confidence: 78%

Sub-synoptic circulation variability in the Himalayan extreme precipitation event during June 2013

Vellore

Bisht

Krishnan

et al. 2019

Meteorol Atmos Phys

View full text Add to dashboard Cite

This study investigates the sub-synoptic scale circulation aspects associated with the extreme rainfall event occurred over the North Indian state of Uttarakhand located in the western Himalayas (WH) during the 15-18 June 2013 period. A diagnosis based on hourly ERA5 reanalyzed circulation products archived on finer grids reveals that sustenance of heavy rains during the event period is supported by a propensity of cyclonic vorticity sources channeled toward the WH region through a narrow quasi-steady conduit in the lower troposphere from the ISM circulation. The equatorward segregating mesoscale potential vorticity (PV) structures from the quasi-stationary upper level PV anomaly (trough) during the event administered two pathways for vorticity sources. The first pathway is from the base of the trough culminating into longer horizontal conduit path from the western Arabian Sea, lending perpetual cyclonic vorticity support to the ISM environment. The second pathway is from the right flank of the trough, which promotes sustained environment of deeper mesoscale convergence zone, potentially unstable atmosphere and strong ascent over the Uttarakhand region. The convergence zone is potentially viewed as a region for strong monsoon and extratropical circulation interactions to occur on finer horizontal scales of motion, where significant vertical synchronization of positive PV advection is realized during the 16-17 June 2013 period. In addition to orographic precipitation enhancements, deeper advective synchronization noticed at sub-synoptic time periods is accredited to the nearly doubling 24-h rainfall amounts in the foothill region of Uttarakhand during the event period. The ERA5 diagnosed diabatic heating additionally indicates that precipitating systems at higher (foothill) elevations contribute to upper (lower) tropospheric heat sources.

show abstract

On the dynamics of an extreme rainfall event in northern India in 2013

Cited by 10 publications

References 42 publications

Water Pathways for the Hindu-Kush-Himalaya and an Analysis of Three Flood Events

Water Pathways for the Hindu-Kush-Himalaya and an Analysis of Three Flood Events

Spatial and vertical structure of precipitating clouds and the role of background dynamics during extreme precipitation event as observed by C-band Polarimetric Doppler Weather Radar at Thumba (8.50° N, 77.00° E)

Sub-synoptic circulation variability in the Himalayan extreme precipitation event during June 2013

Contact Info

Product

Resources

About