scholarly journals Role of mesoscale low and urbanization on exceptionally heavy rainfall event of 26th July 2005 over Mumbai : Some observational evidences

MAUSAM ◽  
2021 ◽  
Vol 60 (3) ◽  
pp. 317-324
Author(s):  
M. MOHAPATRA ◽  
NARESH KUMAR ◽  
B. K. BANDYOPADHYAY
Keyword(s):  
Heavy Rainfall ◽  
Rainfall Event ◽  
Heavy Rainfall Event ◽  
Daily Maximum ◽  
Heat Island ◽  
Research Groups ◽  
Pressure Area ◽  
Urban Heat ◽  
Mesoscale Low

The 26th July 2005 exceptionally heavy rainfall event over Mumbai has been mainly attributed to a mesoscale low/vortex off Konkan coast and urban heat island (UHI) effect as demonstrated by various research groups. However, these studies are limited on observational evidence regarding the existence of the mesoscale vortex and UHI prior to and during this heavy rainfall event. Hence, a study has been undertaken to examine the existence of the mesoscale low off Konkan coast, which might have triggered this exceptionally heavy rainfall over Mumbai and the possible role of UHI effect over Mumbai on this heavy rainfall event. For this purpose the additional synoptic data from Mumbai high region and daily maximum and minimum temperatures over Mumbai region have been analysed. The analysis confirms the existence of a mesoscale low pressure area and isallobaric low to the west of Dahanu during 25th - 26th July 2005. The analysis of daily maximum and minimum temperatures over Mumbai region confirms the UHI effect during 25th -26th July, 2005.

scholarly journals Role of land state in a high resolution mesoscale model for simulating the Uttarakhand heavy rainfall event over India

2016 ◽  
Vol 125 (3) ◽  
pp. 475-498 ◽  
Author(s):  
P V Rajesh ◽  
S Pattnaik ◽  
D Rai ◽  
K K Osuri ◽  
U C Mohanty ◽  
...  
Keyword(s):  
High Resolution ◽  
Heavy Rainfall ◽  
Mesoscale Model ◽  
Rainfall Event ◽  
Heavy Rainfall Event

scholarly journals Roles of Land and Topography on Propagating Convective Systems During the Heavy Rainfall Event of the 2002 Jakarta Flood, Indonesia

2021 ◽  
Author(s):  
Erma Yulihastin ◽  
Danang Eko Nuryanto ◽  
Robi Muharsyah
Keyword(s):  
Heavy Rainfall ◽  
Weather Prediction ◽  
Rainfall Event ◽  
Movement Direction ◽  
Heavy Rainfall Event ◽  
Convective System ◽  
Upward Motion ◽  
West Java ◽  
Convective Systems

The movement direction of propagating convective systems originating from both inland and offshore over the north coast of West Java in Indonesia is determined primarily by the prevailing wind. However, the role of a land-sea contrast and a rugged topography over southern West Java is also expected to affect propagating convective systems by increasing land-sea breezes and enhancing upward motion. These hypotheses are tested using a weather prediction model incorporating convection (up to 3 km height) to simulate the heavy rainfall event during 26–29 January associated with the 2002 Jakarta flood. First, we addressed the influence of land-sea contrast and topography on the local circulation, particularly in the area surrounding Jakarta, by replacing the inland topography over western Indonesia (96°–119°E, 17°S–0°) with a water body with an altitude of 0 m. We then compared the results of model simulations with and without topography. The results show that the main role of the topography here is enhancing the upward motion and generating a deep convective cloud in response to the land-based convective system during 26–27 January 2002, which then continuously and rapidly propagates offshore due to the cold pool mechanism. Furthermore, the land-sea contrast has a significant role in increasing sea breeze under the rapidness of the landward propagation system during 28–29 January 2002, which was strengthened by the gravity waves and resulted in early morning convection over coastal regions.

scholarly journals The role of orographic effects on occurrence of the heavy rainfall event over Central Vietnam in November 1999

2017 ◽  
Vol 17 (4B) ◽  
pp. 31-36
Author(s):  
Dang Hong Nhu ◽  
Nguyen Xuan Anh ◽  
Nguyen Binh Phong ◽  
Nguyen Dang Quang ◽  
Hiep Van Nguyen
Keyword(s):  
Heavy Rainfall ◽  
Wrf Model ◽  
Rainfall Event ◽  
Heavy Rainfall Event ◽  
Monsoon Circulation ◽  
Northeast Monsoon ◽  
Strong Wind ◽  
Orographic Effects ◽  
Central Vietnam

In this study, the WRF model is used to investigate the role of Central Vietnam terrain on occurrence of the heavy rainfall event in November 1999 over Central Vietnam. Two model experiments with and without terrain were performed to examine the orographic blocking effects during the event. In the terrain experiment, the results from a three-day simulation show that the model reasonably well captures northeast monsoon circulation, tropical cyclones and the occurrence of heavy rainfall in Central Vietnam. The topography causes a high pressure anomaly intensifying northeast monsoon. When the terrain is removed, the three-day accumulated rainfall decreases approximately 75% in comparison with that in the terrain experiment. The terrain blocking and lifting effects in strong wind and moisture laden conditions combined with convergence circulation over open ocean are the main factors for occurrence of the heavy rainfall event.

SPECIAL ISSUE ON THE JULY 2020 HEAVY RAINFALL EVENT IN JAPAN

2021 ◽  
Vol 77 (1) ◽  
pp. 230-233
Author(s):  
Hiromune YOKOKI ◽  
Tatsuhiko UCHIDA ◽  
Atsushi INAGAKI ◽  
Makoto TSUKAI ◽  
Shinta SETO ◽  
...  
Keyword(s):  
Heavy Rainfall ◽  
Rainfall Event ◽  
Heavy Rainfall Event ◽  
Special Issue
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