“Doppler weather radars are ideal for near-real time tracking of potential cloud bursts. The plans were set in place after the devastating Kedarnath cloud burst in 2013 that killed more than 5,000 people in the region. The reason for the installation is to predict cloudbursts and other extreme rainfall events, further generating alerts through early warning systems. In January 2021, the IMD and state government installed a doppler weather radar in Mukteshwar in Kumaon, which had been in the pipeline for many years. But the official response to these events has been slow. In 2019, there was a cloudburst event in Chamoli district while there were a dozen of these events in 2018. Nineteen of the 30 major cloudburst events reported from the southern rim of the Himalayas in the Earth Science Reviews study occurred in Uttarakhand. Uttarakhand is highly prone to cloudburst events. The Earth Science Reviews paper also pointed out that the IMD definition of a cloudburst needed to be changed based on the region where they occurred, the local normal rainfall rates, damage potential and vulnerability of the region. Any incidents of very heavy rain within a short span of time often get termed as a cloudburst while the official definitions usually vary across the world. However, it must be noted that there is no official confirmation of ‘cloudburst’ so far and it is unlikely that sufficient heavy rains have occurred at any place for an official declaration. The many factors that have to come together to make a cloudburst event happen make them highly unlikely. Sometimes winds flowing in from the north west also aid the occurrence of cloudbursts. The moisture is usually provided by a low pressure system (usually associated with cyclonic storms in the ocean) over the Gangetic plains associated with low level winds flowing in from the east. Cloudbursts mostly occur at elevations between 1,000-2,500 metres above sea level. The energy necessary for the cloudburst comes from the upward motion of air. These unstable clouds cause an intense rainstorm over a small area after becoming heavy enough and locked in the ridges and valleys between the hills. This upward motion of the clouds is known as an ‘orographic lift’. Such clouds usually cause rain, thunder and lightning. However, the India Meteorological Department (IMD) defines a cloudburst as any event where 100 millimetres of rainfall have fallen in a span of an hour over a region that is 20-30 square kilometres in area.Ī cloudburst occurs when moisture-carrying air moves up a hilly terrain, forming a vertical column of clouds known as ‘cumulonimbus’ clouds. There is no universal definition of a cloudburst. There was also a low-pressure ridge across the region which might have increased the chances of the cloudbursts.Ĭloudbursts are sudden and extreme rainfall events over a limited area in a short span of time. Cloudbursts are generally more common in India during the south west monsoon season that begins in June, according to a research paper published in the journal Earth Science Reviews in March 2017. Research is supportive of Murtugudde’s statements. “This would also reduce pressure and drive winds into it,” he said. Murtugudde added that the months of March, April and May were warmer than normal over Uttarakhand. My guess is that this is raising the chances of cloudbursts there. The Arabian heat low pumps winds into the northern Arabian Sea and there has been a strong wind along the coast of Oman and going straight over Gujarat into Uttarakhand. What is unusual in the current scenario is the very warm temperature anomaly to the west of north India over Iran, Pakistan and Afghanistan.

Raghu Murtugudde, a climate scientist at the University of Maryland in the United States, told DTE that cloudbursts were weather events that were hard to predict by definition. No casualties have been reported so far in the recent events even though many buildings were washed away and roads were flooded with mud, water and debris. Two other events were reported from Uttarkashi and Rudraprayag districts. The latest of these occurred on the evening of May 11 in Devprayag town of Tehri Garhwal district.

The recent weather events in Uttarakhand termed as ‘cloudbursts’ were highly unusual and could have been caused by the warming of the region, an expert told Down To Earth ( DTE) May 12, 2021.Ĭloudburst-like events have hit Uttarakhand since May 3 and have caused considerable damage in the four hilly districts of Tehri Garhwal, Rudraprayag, Uttarkashi and Chamoli. Destruction wrought by the cloudburst in Devprayag town of Uttarakhand.

Cloudburst uttarakhand