Trends of thermodynamic indices thresholds over two tropical stations of north-east India during pre-monsoon thunderstorms. (December 2020)

• Record Type: Journal Article
• Authors: Sahu, Rajesh Kumar; Dadich, Jiteshwar; Tyagi, Bhishma; Vissa, Naresh Krishna
• Is Part Of: Journal of atmospheric and solar-terrestrial physics. Volume 211(2020)
• Publication Date: 2020-12
• Subjects: Thunderstorm -- Thermodynamic indices -- Skill score analysis -- Global warming -- Climate change; Geophysics -- Periodicals; Atmospheric physics -- Periodicals; Géophysique -- Périodiques; Météorologie physique -- Périodiques; Electronic journals; 551.51
• DOI: 10.1016/j.jastp.2020.105472
• Languages: English
• ISSNs: 1364-6826

Abstract

Abstract: Thermodynamic indices have been used as a tool for nowcasting thunderstorms for decades. The present study deals with understanding the variations in threshold values of various thermodynamic indices during pre-monsoon season at two north-eastern Indian stations: Agartala and Guwahati. The study utilises thirty years (1987–2016) of radiosonde data, surface information about thunderstorms, and TRMM daily rainfall data. The threshold values for five years period interval each has been determined for fourteen thermodynamic indices to the whole period. The indices related to latent, potential and convective instability responded differently at both the sites. Highlights: The study analyses thermodynamic indices related to thunderstorms for 1987–2016 over Guwahati and Agartala. Threshold values for five years each have been found for the study. 12 UTC threshold values are showing clear trends at both the sites. CAPE and CIN threshold values are increasing over the sites.