Delhi-NCR experienced one of its strongest pre-monsoon storms of the season this week, with wind speeds reaching an extraordinary 128 kmph at Pusa. The storm uprooted trees, damaged property, disrupted flights and blocked roads across several parts of the capital. Yet despite its destructive force, the storm delivered only limited rainfall, leaving many residents wondering what exactly is driving these increasingly frequent weather events.
Meteorologists say the answer lies in a volatile combination of heat, moisture and atmospheric instability that has been building across northwest India ahead of the monsoon.
Extreme heat turned the atmosphere into a pressure cooker
According to the Hindustan Times, the first ingredient behind the storm was intense surface heating. Delhi recorded a temperature of 43.5 degrees Celsius, making it the hottest day of June so far and significantly above seasonal norms.
When the ground heats up much faster than the air above it, the atmosphere becomes unstable. Warm air near the surface rises rapidly because it is lighter than the cooler air above. As this process intensifies, the atmosphere stores enormous amounts of energy that can later be released through powerful thunderstorms and dust storms.
Scientists measure this energy using a parameter known as Convective Available Potential Energy, or CAPE. High CAPE values indicate that the atmosphere is primed for explosive storm development once a trigger arrives.
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Moisture and weather systems provided the spark
Heat alone does not create a storm. Moisture is equally important.
According to the Hindustan Times, a cyclonic circulation moving from the northwest, near Pakistan, transported moisture into the region. This moisture helped rising air form clouds more easily and strengthened the upward movement within the atmosphere.
At the same time, a low-pressure trough stretching across Rajasthan, Haryana and Delhi funnelled warm, moist air into the developing weather system. According to weather experts, this combination of heat and moisture created an environment highly favourable for severe convective activity.
The cyclonic circulation ultimately acted as the trigger that unleashed the stored energy.
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Why may dust storms remain common before the monsoon?
According to the Hindustan Times, the India Meteorological Department says four factors generally determine the intensity of pre-monsoon storms: strong heating, sufficient moisture, atmospheric instability and a triggering weather system.
All four elements were present during Tuesday’s event.
Northwest India often experiences relatively dry storms before the monsoon arrives because moisture levels are not always high enough to generate widespread rainfall. Instead, powerful winds descend from storm clouds and lift dust and debris into the air, creating the dramatic dust storms frequently seen across Delhi-NCR.
