The recent spells of hailstorms and unexpected rain in Bengaluru have caught many residents off guard, especially during what is typically a warm and dry pre-summer period. Experts say the phenomenon is linked to a mix of heat, moisture, and atmospheric instability.
Heat and moisture create instability
As temperatures rise in March, the ground heats up rapidly. This causes warm air to rise quickly into the atmosphere. At the same time, moisture-laden winds from nearby water bodies add humidity to the air.
When this warm, moist air rises and meets cooler air at higher altitudes, it creates instability—leading to the formation of towering thunderclouds.
Formation of hailstorms
Within these storm clouds, strong updrafts carry water droplets high into freezing layers of the atmosphere. These droplets freeze into ice pellets and grow in size as they move up and down within the cloud.
Once they become too heavy, they fall to the ground as hail, often accompanied by heavy rain and gusty winds.
Pre-monsoon weather pattern
Meteorologists note that such weather is typical of pre-monsoon convective activity, which usually begins in parts of Karnataka around this time of year.
These storms are often short-lived but intense, bringing sudden showers, lightning, and sometimes hail.
Why it feels unusual
While such events are not uncommon scientifically, their intensity and timing can feel unusual to residents. Rapid urbanisation and rising temperatures may also be amplifying local weather patterns.
What to expect ahead
Weather forecasts indicate that Bengaluru may continue to experience intermittent thunderstorms in the coming days, especially in the afternoons and evenings.
Experts advise residents to stay cautious during sudden weather changes, particularly due to lightning, strong winds, and reduced visibility.