Sincemay15, lightning strikes havekilled315inupandbihar

Farmers, labourers engaged in agriculture-related work in fields affected the most

with 77% excess rainfall in the week of June 24 to July 1. East Uttar Pradesh received 72% excess rainfall in the same period with 79% excess only in the week of June 24 to July 1.

The convective clouds result in lightning of the cloud to ground type (the rarest form of lightning according to scientists, and also the one that does the most damage).

“There is a lot of convective activity there because the monsoon trough was passing near the Himalayan foothills and now there is a cyclonic circulation over east UP. Cloud to ground lightning (the kind which usually causes damage) is nothing but current passing from cloud to ground. Such discharge happens when certain kinds of convective clouds form. These clouds may be forming over east UP and Bihar the most now because of surface heating and weather systems bringing intense rain there. But we have to see if people in these states are taking adequate precautions,” said DS Pai, senior scientist, IMD Pune.

That may not be happening. Other scientists say that intense rains have led to more farmers being out in the field making the most of the monsoon for their paddy crop. “This year the number of lightning incidents and lightning deaths is more frequent over Bihar and eastern UP because the region is seeing intense rain quite early in the monsoon in June. In previous years this region usually didn’t receive such rains in June. Because of good rainfall this year in June, farmers are out in the field farming. Paddy field water also attracts electricity and farmers on the field act as conductors of electricity from the thunderstorm,” explained Sunitha Devi, member of Ministry of Earth Sciences’ thunderstorm working group.

In 2018, at least 100 people died due to thunder squalls in west UP, Rajasthan and Haryana following which the ministry of earth sciences formed a working group

that developed a model to assess how many lightning flashes may occur and how strong the wind is likely to be.

IMD’S working group can forecast approaching thunderstorms two to three days in advance but cannot pinpoint the location of lightning strikes that much ahead of time; its nowcast feature predicts the location of lightning and thunder about 3 hours in advance. “Thunderstorms occur in different parts of the country. Marathwada for example is known to record the highest number of fatalities. Fatalities are not high in the pre monsoon months of April- May—a major season for thunderstorm and lightning— probably because people are not working on their fields. Lightning severity is more over Bihar and adjoining Uttar Pradesh

due to the presence of humid air topped with comparatively drier air in the mid and upper levels, aiding more tall clouds. Over peninsular region and north east India, moisture depth and content being higher, clouds will start raining out, before growing tall. The lightning severity from such clouds are less,” added Sunitha Devi.

Such tall clouds are prone to cause lightning strikes or flashes, another expert explained.

“In monsoon season hydrometeoric (water or ice particles) concentration is more so there is more charge build up. If it’s a very tall cloud then charge neutralisation happens within the cloud also called intra cloud lightning. If cloud height is tall but not extremely tall there is more charge separation and cloud to ground lightning.kharif crops are planted in this season. Paddy field acts as ionic fluid and many farmers get electrocuted at once,” said Soma Sen Roy, also from the working group.

According to a paper titled “The major lightning regions and associated casualties over India” published in Springer Nature in February, the maximum casualties are reported in Madhya Pradesh (313 deaths), Maharashtra (281 deaths) and Orissa (255 deaths) on an average every year.

On Saturday, IMD warned that intense thunderstorms and lightning are likely over south-east Uttar Pradesh, Bihar, east Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, east Vidarbha and Odisha during the following 12 hours.