On the Forecasting of Nor'westers in Gangetic West Bengal

Authors

  • N.C. RAI SIRCAR

DOI:

https://doi.org/10.54302/mausam.v8i1.4988

Keywords:

Norwesters, Radiosonde, Gangtic West Bengal, Thunderstorm.

Abstract

A comparative study has been made of the upper air data based on radiosonde ascents at Calcutta and Allahabad, in relation to two distinct classes of days, namely, those of wide spread nor'westers of the pre-monsoon season over Gangetic West Bengal and those altogether free from such storms. It is seen that the most important contributory factors to the genesis of well developed nor westers are, increased humidity resulting in suitable distribution of wet bulb temperatures m the first two kilometres and cyclonic convergence in the lower moist air field to provide the initial impulse for upward convection, and that the advection of colder air at higher levels is not an essential criterion.

A nomogram using dry bulb and dew point temperature values at 850-mb level in the morning has been suggested to serve as an empirical, but quite a useful, tool for the forecasting of nor'westers over Gangetic West Bengal during the pre-monsoon season.

Downloads

Published

01-01-1957

How to Cite

[1]
N. R. . SIRCAR, “On the Forecasting of Nor’westers in Gangetic West Bengal”, MAUSAM, vol. 8, no. 1, pp. 21–32, Jan. 1957.

Issue

Vol. 8 No. 1 (1957): MAUSAM

Section

Research Papers

License

Copyright (c) 2022 MAUSAM

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

All articles published by MAUSAM are licensed under the Creative Commons Attribution 4.0 International License. This permits anyone.

Anyone is free:

  • To Share - to copy, distribute and transmit the work
  • To Remix - to adapt the work.

Under the following conditions:

  • Share - copy and redistribute the material in any medium or format
  • Adapt - remix, transform, and build upon the material for any purpose, even
    commercially.