The pre-monsoon seasonal trough across the interiors of South India has finally swung into action. The feature was mostly lying dormant, delaying the usual thunderstorm activity, so far. Small circulations and circular bubbles in the proximity of the coastline are streaming moist winds over the interiors of Peninsular India. Heat and moisture, together, will increase the pace of relief thunderstorms, across the region. The activity may last for a week or so. Moderate to intense showers are likely over South interior Karnataka, inclusive of the capital city of Bengaluru.
The tech city reeled under prolonged dry conditions, since early January. This was the longest dry spell, registered in the last two decades or so. The mercury shot up to record levels during April and the city soared at the start of May, as well. The first pre-monsoon bout, with large spread and intensity, were witnessed across most parts of the city and suburbs. Activity is expected to continue during the week and rollover to the next week is also likely.
All the observatories of the city have recorded rainfall of 18 to 20mm in the past 24 hours. As such, the normal rainfall for the city in May is nearly double that of April. May has an average of 128.7mm, as against 61.7mm of April. Pre-monsoon thunderstorms are more frequent in May than monsoon bursts of June. The month of June has a normal rainfall of 110.3mm.
It is likely to be a rainy week for the city, with intermittent breaks. Multiple weather systems will keep the activity live, mostly during late afternoon and evening. Oscillation of north-south seasonal trough, wind discontinuity between easterly and westerly winds and a push by the offshore vortices, will be the trigger, for regular thunderstorms. The city can expect that the worst phase of heat and roast has gone past. Better weather conditions, typical of Bengaluru, look to be in place, to raise the comfort levels.
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