Southwest Monsoon made an amazing record by setting its onset over both sides of the country at the same time. The Monsoon current as we forecasted reached on May 30th. This type of onset for both Bay of Bengal & Arabian sea brunch at the same time is rare & the last time it occurred on 2017. Another interesting fact is that like that year monsoon made its onset over Indian mainland at the similar time of the year. The Southwest Monsoon was advancing in every region this year prior to its actual time. The main difference between 2017 & this year monsoon is that in 2017 the Southwest monsoon remained stagnant over Southern & Northeast India for a long time. But this time it continued to advance nearly every day & making big jumps every day. On May 30 in 1 jump it covered the entire Northeast India & then on the next day it covered the northern parts of Sub Himalayan West Bengal & Sikkim. Widespread rainstorm activities continuing over those region, especially over Northeast India, with Southern Meghalaya receiving heavy to extremely heavy rain. Sohra recorded 219 mm of extremely heavy rain on May 31st.
Conditions are further favorable of advancement of the Southwest monsoon over Southern Karnataka & adjoining Tamilnadu in a day Or two. Pre monsoon regular thunderstorm over Eastern India with isolated heavy to very heavy rains clearing way for the further advancement of the Southwest monsoon over Eastern India. The fast it cover the entirely Indian Sub continent the fast the ongoing deadly heat wave spell will end which killed almost 200 people till now with temperature clocking over or near 50°C in the vast region of Northern & Central India.
However despite the environment for the advancement of monsoon deep into the country strong weather systems needed. The Western brunch mostly get powered by a off shore trough created by the instability over Western Ghats due to the heat difference while the Bay brunch get activated when a system forms over Northeast Bay of Bengal. The Bay of Bengal brunch has a greater role to give relief over the entire parts of the country rather than the Arabian sea brunch as it goes through the Great Indo Gangetic Plains without any obstacles. Fortunately we expect a low or circulation likely to form over the East Central & Adjoining Northeast Bay of Bengal as the current east west trough located over the foothills of himalaya will fall over Bay of Bengal leading to intense thunderstorm activities throughout trough axis. The low will follow up the trough line & head Northwest activating the monsoon surge over Bay. The low even might strengthen on its way to Eastern India & adjoining Bangladesh from the current favorable conditions over the head bay such as warm SST & TCHP but that's yet to watched. But it'll help for advancement of the monsoon in Eastern India.
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