Why hailstorms are so rampant in the spring

Several parts of Haryana, Uttar Pradesh, Delhi and the National Capital Region witnessed hailstorms on Friday night and Saturday morning

Spring is here, hail too! After a very cold winter this season in North India, the temperature has finally started to rise since mid-February as we enter spring. A western disturbance series, which was unusually higher since winter, is also showing its effects in the spring. Many parts of Haryana, Uttar Pradesh, Delhi and the National Capital Region witnessed heavy hailstorms on Friday night and Saturday morning.

Why do hailstorms happen when the weather gets warmer? Let’s examine the science of hailstorms to answer the questions.

When spring begins, it means that the surface temperature is warmer than in winters. But this does not mean that it also heats up in the different layers of the atmosphere. Conditions become more favorable for severe weather, in our case hailstorms, when westerly disturbances/jet streams between 200 and 500 hpa (cold air on upper levels) encounter winds that feed moisture , the easterly winds from the Bay of Bengal and the southwest from the Arabian Sea between 850 -925 hpa (surface warm air levels) considering the factor that they cross over the ground with higher surface temperatures.

The combination of meteorological characteristics paved the way for the formation of cumulonimbus clouds which cause intense thunderstorms over northern, central and eastern India. Hail is formed in the ascending current of the storm which is the hot air rising in the cumulonimbus clouds. It lifts water droplets higher in the atmosphere where air temperatures are below freezing, which converts the droplets into hailstones; later, the earth’s gravity pulls the hailstones towards the earth.

While descending, it passes through many obstacles such as strong horizontal winds, humidity levels and also temperature differences which ultimately decide the size of the hail that falls. In the spring, freezing levels in the clouds are lower than in the monsoon. This is why hail quickly reaches the ground during these months. During the monsoon, the cloud freezing level is higher and the surface temperature is very warm, causing hail to melt as water or rain droplets before reaching the surface. This also explains why hailstorms do not occur in India during monsoons.

During the past week, from February 20 to 26, rain and hailstorms were observed in central, eastern India (on February 24) and in the plains of northern India ( February 22, 23, 25 and 26), causing damage to the standing rabi crop. .

Weather forecast for all India from February 27 to March 5

  • Dry weather in northern India on February 27-28 with cooler than normal temperatures. Under the influence of two western disturbances in rapid succession from March 1, further snowfalls are expected in the Himalayas and another round of rainfall and hail in some parts of the plains with maximum spread and intensity the March 3 and 4.
  • This week North East and East India will experience mostly dry weather; the nights will be cool and the daytime temperature will start to rise towards the second half of the week. No significant weather systems are likely to affect the region.
  • Following the trend of recent weeks, most parts of western and central India will continue to enjoy dry weather and mildly warm daytime temperatures.
  • South India will be dry and hot in the first half of the week. An area of ​​low pressure is likely to form over the southeastern Bay of Bengal and southern Andaman Sea by February 28. Moving eastward with the influence of the Easter winds, it is expected to affect the weather in southern India, especially in Tamil Nadu and Kerala where moderate to heavy rains are expected from May 2 to March 5.

Weather forecast by region from February 26 to March 5

North India

  • Fresh North West of 15-25 km/h from February 27 to March 1.
  • Weak to moderate western disturbance March 1-5.
  • Induced cyclonic circulation and warm southwesterly winds from March 2 to 5.

Weather Forecast for Hilly States

After the recent wave of heavy snowfall in the Himalayas, the weather is expected to improve on Sunday and Monday with a significant drop in overnight temperatures. Cold snap conditions could develop in parts of Kashmir, Ladakh and Himachal Pradesh on February 27-28.

As we expect, Western disruptions will likely impact hilly states. From March 1; Light to moderate fresh snowfall will be seen in Kashmir, Ladakh, Himachal Pradesh, middle and upper reaches of Uttarakhand. Lower hills of the state with Jammu division to observe light to moderate rainfall activities as well as hail storms.

Plains weather forecast

Cool northwest winds will keep the temperature under control for the first half of the week. From Wednesday, the daytime temperature will start to rise towards 30°C in Punjab, Haryana, Delhi and Uttar Pradesh, it will easily cross 35°C in the center and south-west of Rajasthan.

Under the influence of western disturbances and induced cyclonic circulation, southerly winds, rainfall and hailstorms are expected to affect parts of Punjab by March 1 and Delhi, Haryana, Rajasthan and India. western Uttar Pradesh on March 3 and 4; thunderstorms can accompany strong winds during this period.

Minimum and maximum temperature expected from February 27 to March 5

  • Punjab: 7.0 to 12.0°C, 22.0 to 28.0°C.
  • Haryana: 8.0-13.0°C, 24.0-31.0°C.
  • Rajasthan: 9.0 to 16.0°C, 28.0 to 37.0°C
  • Delhi NCR: 9.0-14.0°C, 23.0-30.0°C.
  • Uttar Pradesh: 9.0 to 15.0°C, 26.0 to 34.0°C.

Central India

Synopsis of Significant Time

  • Cool northwest winds on February 27 and 28.
  • Dry weather throughout this week.

Following the trend of the previous week, the weather is expected to remain clear and dry in central India, which is very beneficial for farmers planning to harvest rabi crops in the region.

Cool northwest winds from India will ensure cool nights in Gujarat, Madhya Pradesh, Chhattisgarh and Maharashtra over the next two days. Meanwhile, days will be mildly warm in Interiors and on the west coast, including Mumbai, where daytime temperatures will be around 35C next week. As no significant weather system can affect the region next week, no rainfall is forecast for central India.

Minimum and maximum temperature expected from February 27 to March 5

  • Gujarat: 13 to 19.0°C, 29.0 to 35.0°C.
  • Maharashtra: 10.0-21.0°C, 28.0-35.0°C.
  • Madhya Pradesh: 9.0 to 15.0°C, 27.0 to 36.0°C.
  • Chhattisgarh: 11.0 to 17.0°C, 29.0 to 37.0°C.

Eastern India

Synopsis of Significant Time

  • Cool northwest winds from February 27 to March 2.
  • Hot days.
  • No other significant weather systems.

Under the influence of cool northwesterly winds, nights will remain cool this week in Bihar, Jharkhand, West Bengal and northeast India. As dry weather is expected across the states, daytime temperatures are expected to rise and warmer weather will start to emerge in eastern India now.

Minimum and maximum temperature expected from February 27 to March 5

  • Bihar: 9.0-16.0°C, 27.0-32.0°C.
  • Jharkhand: 11.0 to 17.0°C, 28.0 to 34.0°C.
  • West Bengal: 14.0-18.0°C, 26.0-32.0°C.
  • Odisha: 14.0-19.0°C, 27.0-35.0°C.
  • North East India: 7.0 to 13.0°C, 19.0 to 27.0°C.

South India

Synopsis of Significant Time

  • Dry and hot weather at the beginning of the week.
  • An area of ​​low pressure is expected to form in the southeast Bay of Bengal and near the southern Andaman Sea by February 28.

Mainly dry and clear weather is expected in Goa, Karnataka, Telangana, Andhra Pradesh, Tamil Nadu, Kerala from February 27 to March 2. The overnight temperature profile will be pleasant, while the days can be hot and sunny.

Under the influence of low pressure area and easterly winds, windy weather accompanied by moderate to heavy rains will occur in Tamil Nadu, southern Andhra Pradesh and Kerala from March 2 to 5. Heavy rainfall in the southern states will be a bit unusual for March, it could lead to waterlogging in low lying areas.

Minimum and maximum temperature expected from February 27 to March 5

  • Telangan: 18.0 to 22.0°C, 30.0 to 36.0°C.
  • Andhra Pradesh: 21.0-25.0°C, 28.0-37.0°C.
  • Goa: 21.0-24.0°C, 32.0-35.0°C.
  • Karnataka: 16.0 to 23.0°C, 29.0 to 35.0°C.
  • Tamil Nadu: 21.0-26.0°C, 30.0-35.0°C.
  • Kerala: 22.0-26.0°C, 32.0-35.0°C.

The author, better known as Rohtak Weatherman, interprets and explains complex weather patterns. His @navdeepdahiya55 impact based predictions are very popular in North India.

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