• Talat Parveen
• Dr. H. Aleem Basha

This study is intended to explore the observations and comparisons of variation in instability parameters (Showalter index, Lifted index, K index and Total Totals index) in different weather regions using Radiosonde data over India. The duration of IGRA data is 20 years from Jan 1996 to Dec 2016 for the present study and we are planning to extend this data up to December 2019 for further studies. Six different regions (New Delhi, Mumbai, Kolkata, Hyderabad, Bangalore and Chennai) have been selected for the study. Profiles of the above mentioned parameters for the six regions have been plotted for the duration. We have observed maximum and minimum values of the parameters for six regions and have been tabulated. For the six regions it observed that SI depicts positive maximum predicting no thunderstorms and negative values compared to critical values revealing possibility of occurence of more thunderstorms. While comparing the six regions we observe , Mumbai, is more prone to severe weather. Similar to SI, it is observed that the LI values show negative for all the regions indicating occurence of more thunderstorms. LI also predicts that the region Mumbai, is influenced to severe weather. The K index values lie in the range 45 to 50 corresponding to high instability are increasing as we move towards north which indicated increase in thunderstorm probability.

Showalter index, Lifted index, K index and Total Totals index

"Observation and comparisons of variation in instability indices in different weather regions of India through radiosonde data ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 3, page no.1601-1608, March-2021, Available :http://www.jetir.org/papers/JETIR2103203.pdf

"Observation and comparisons of variation in instability indices in different weather regions of India through radiosonde data ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 3, page no. pp1601-1608, March-2021, Available at : http://www.jetir.org/papers/JETIR2103203.pdf