Monsoon 2021: When Will Monsoon Rains Start over Bengaluru and Different Elements of Karnataka?


Rain clouds hover over Vidhana Soudha in Bengaluru, Karnataka.

(Ravindra Nayak C H/VK, MMCL, Bengaluru)

Wednesday, June 2: Fondly known as ‘Mungaru Male’ in Kannada, the Southwest Monsoon is a lifeline for the predominantly agrarian society of Karnataka. Even Bengaluru, which is understood for its nice climate, has been going through a rising water scarcity lately. Subsequently, this can be very essential that the monsoon brings sufficient rains throughout Karnataka for each its economic system and well-being.

Following the delayed onset of the southwest monsoon season over Kerala, the primary monsoon showers are anticipated to succeed in Karnataka barely later than standard—commencing by the beginning of subsequent week. But, it’s not a reason behind concern, as the general rainfall is anticipated to stay above regular throughout the state this 12 months.

Sluggish progress of monsoon through the first half of June

Final month, between Might 21 and 27, the southwest monsoon was pulled dramatically ahead from the Andaman Sea to the southwest Bay of Bengal by the current Cyclone Yaas. However come Might 30, the monsoon’s northern restrict was noticed to have gotten caught over the Maldives-Comorin space, passing over Sri Lanka and southwest and the east-central Bay of Bengal.

This resulted within the India Meteorological Division (IMD) revising its earlier forecast of monsoon onset over Kerala from Might 31 to June 3. The weakening of lower-level southwesterly winds because of the eastward development of the Madden–Julian oscillation (MJO) is the probably trigger for the delayed onset. Naturally, its graduation over the remainder of Indian states is anticipated to get barely delayed as nicely.

The following beneficial section of MJO over the Indian Ocean is probably going within the third week in June. Subsequently, rainfall might stay subdued throughout the west coast of India until MJO kicks off extra convection within the second half of June. Accordingly, the progress of the western finish of the monsoon trough is anticipated to stay sluggish within the first two weeks of June.

Delayed monsoon onset

On Wednesday, June 2, the IMD has confirmed that the spatial rainfall distribution over Kerala has elevated. The westerly winds have strengthened within the decrease ranges over the south Arabian Sea, and there is a rise in cloudiness over the Kerala coast. These situations point out that rainfall exercise will get enhanced throughout Kerala within the subsequent 24 hours, successfully resulting in the onset of monsoon season on June 3.

On common, the southwest monsoon arrives over Kerala on June 1. Thereafter, it takes about 2-3 days for the monsoon to succeed in its neighbouring state of Karnataka, the place the common onset date is June 3. Subsequently, contemplating the sluggish progress of the monsoon this 12 months and the Kerala onset on June 3, it’s anticipated to get to Karnataka round June 7.

June 3 can be the conventional date of monsoon onset for Bengaluru primarily based on the long-term common between 1961 to 2019. This 12 months, a 3-4-day delay is anticipated within the arrival of monsoon rains to the silicon valley of India. Nonetheless, usually cloudy skies together with one or two spells of rain and thundershowers are forecast for Bengaluru from June 4 onwards.

Pre-monsoon showers to proceed

Till the monsoon showers start throughout Karnataka, the state will proceed experiencing pre-monsoon rains. These moist situations shall be brought on by the mix of moist westerly winds blowing in from the Arabian Sea and a cyclonic circulation positioned off the Karnataka coast.

Over the subsequent 5 days, pretty widespread to widespread rainfall has been forecast over Karnataka and its neighbouring states. Whereas the distribution might fluctuate from district to district, the depth of the falls will stay between mild and reasonable.

In the meantime, as per the IMD’s newest long-range monsoon forecast, Southern Peninsular India is anticipated to obtain regular rainfall between June to September 2021. This ‘regular’ monsoon season will arrive on the again of a wetter-than-average pre-monsoon season.

Between March 1 and Might 31, South Peninsular India collectively recorded 168.7 mm precipitation—a 39% extra in comparison with its long-term common. Karnataka registered rainfall value 179.4 mm, marking an extra of 54%.

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