![]() These storms originate over the Chhotanagpur Plateau between the states of Bihar and Jharkhand. ![]() Based on event descriptions and the meteorological environments involved, these storms can be classified as progressive derechos. The period of nor'wester formation generally begins in April and lasts until the monsoon establishes itself over Northeast India, although March nor'westers are not unknown. Heavy hailstorm during a nor'wester in Thakurgaon, Northern Bangladesh (April 2022) In Assam, the event is known as a bordoisila, which is derived from the Bodo word bardoisikhla, in which bar means wind, dol means water and sikhla means girl, represents the goddess of nature, wind and rain and also marks the beginning of the Assamese month Bohag or Baishagu. The term "nor'wester" is more commonly used in English newspapers since these storms travel from northwest to southeast. In Bengali, " kalbaisakhi" ( Bengali: কালবৈশাখী) refers to a "fateful thing" which occurs in the Bengali month of Baishakh. ![]() These storms generally occur in the afternoon or just before sunset, when thick dark black clouds start appearing over the sky and then bring gale-speed wind with torrential rain, often with hail, but spanning only a short period of time. A kalbaisakhi ( Bengali: কাল বৈশাখী) ( Odia: କାଳ ବୈଶାଖୀ), also known in Assam as a bordoisila and in some English publications as a nor'wester, is a localised rainfall and thunderstorm event which occurs in Bangladesh as well as the Indian states of Bihar, Jharkhand, Odisha, Tripura and West Bengal. ![]()
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