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Report on Extreme Weather Events During June-December 2018

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Report on Extreme Weather Events During June-December 2018 VayuMandal 45(1), 2019 Report on Extreme Weather Events during June-December 2018 1. Introduction country. In this report, an attempt is made to bring out details and impact of the extreme The rainfall over the country as a whole during weather phenomena during the monsoon (June the monsoon season (June–September) was 91% to September) and post-monsoon (October to of its Long Period Average (LPA) thus this December) seasons of 2018. season was categorized as a normal monsoon. Seasonal rainfall over Central India (93% of 2. Cyclonic Circulations LPA) Northwest India (98% of LPA) and South 2.1 Monsoon season (June to September Peninsula (98% of LPA) regions were normal 2018) while East and Northeast Region remained deficient at 75% of LPA and rainfall over this During the monsoon season, eleven low pressure was deficient throughout the monsoon months. systems (1 cyclonic storm, 1 Deep Depression, 4 The seasonal rainfall in 2018 over East and Depressions, 1 well marked low pressure area & Northeast India remained the second lowest ever 4 low pressure areas) were formed. The tracks of received by the region with its lowest value in 6 depressions and cyclonic storms formed 2013 (73% of LPA). Southwest monsoon during the monsoon season from June to reached parts of southeast Bay of Bengal, south September 2018 are shown in Figure 1. All Andaman Sea and Nicobar Islands on 25th May these systems were formed over the Bay of (5 days later than its normal date). It advanced Bengal and moved westward across central over Kerala on 29th May, 3 days ahead of the India. A brief discussion about the intense normal schedule and covered the entire country systems (Depressions, Deep Depression and by 29th June (a fortnight earlier than the normal Cyclone) shown in Figure 1 are presented date). Monsoon withdrawal was delayed and below. commenced from parts of northwest India on 29th September (with a delay of nearly a month). The first intense system of the season was a The monsoon season during June to September Depression (10th-11th June) over northeast Bay generally witness heavy rainfall over many parts of Bengal and adjoining Bangladesh coast. The of India associated with active monsoon trough, second depression of the season was formed in offshore vortex, west-coast trough, mid- July as a low pressure area over northwest Bay tropospheric cyclone etc. This season is also of Bengal and adjoining Gangetic West Bengal characterized by the formation of low pressure and Odisha on 19th July which concentrated into system over the north Indian Ocean and their a Depression on 21st July morning and intensification into depressions, which give rise intensified into a Deep Depression in the to heavy rainfall over many parts of the country. afternoon of 21st July. It crossed north Odisha The post-monsoon season during October- and West Bengal coasts in the evening of 21st December witnessed intense tropical cyclone July close to the south of Digha and moved west over the north Indian Ocean. The other synoptic northwest-wards across the central parts of the systems that affect the post-monsoon season are country. Under the influence of the system, easterly wave in the south, western disturbance, widespread and intense rainfall activity occurred cold wave and fog in the northern part of the over Odisha, Gangetic West Bengal, 97 VayuMandal 45(1), 2019 Figure 1: Six Depressions and Cyclones formed during monsoon season 2018 Chhattisgarh, Jharkhand and Madhya Pradesh. neighbourhood on 9th August. It caused fairly Exceptionally heavy rainfall was recorded over widespread to widespread rainfall activity with Burla ARG (62 cm), Sambalpur (57 cm) and heavy to very heavy and extremely heavy falls Birmaharajpur ARG (43 cm) in Odisha. While over eastern parts of Central India. The second moving west northwest-wards it weakened and system in August formed as a low pressure area its remnant lay over northwest Uttar Pradesh and over Northwest Bay of Bengal and adjoining neighbourhood as a low pressure area on 28th Coastal areas of West Bengal and Odisha on 13th July. Its persistence over West Uttar Pradesh August. It subsequently concentrated into a and neighbourhood for nearly three days caused Depression and lay over Coastal Odisha and fairly widespread to widespread rainfall activity neighbourhood on 15th August, moving west- with heavy to very heavy and extremely heavy northwestwards, it weakened gradually and lay falls over Western Himalayan Region and as a low pressure area over southwest Madhya adjoining plains of northwest India during 26th Pradesh and neighborhood on 17th August. to 28th July. Under its influence, fairly widespread to widespread rainfall activity with heavy to very The first system of August was formed as a Low heavy falls had been reported from parts of east Pressure Area over Northwest Bay of Bengal and and adjoining central India. Strengthening of the neighbourhood on 6th August. It subsequently monsoon flow due to the formation of the low concentrated into a Depression and crossed north pressure system had caused widespread intense Odisha, West Bengal coasts and moved west rainfall activity over south peninsular India. northwest-wards and weakened into Well During the above mentioned active phase, Marked Low Pressure Area over Chhattisgarh vigorous monsoon conditions occurred on 5-6 and neighbourhood and finally lay as a low days over Kerala and southern parts of pressure area over north Madhya Pradesh and Karnataka. There had been a few instances of 98 VayuMandal 45(1), 2019 extremely heavy rainfall events over these interacting with a Western Disturbance and thus regions as well as over the Ghat sections of the system, after weakening into a well- marked Tamil Nadu. low pressure area, started re-curving northwards. This constructive interaction between the The first system during September was formed monsoon low pressure system and the Western as a Low pressure area over northwest Bay of Disturbance caused a revival of the active to Bengal & neighborhoods in the morning of 5th vigorous monsoon conditions over central and September and became a Well Marked Low northwest India during 21st to 25th September. Pressure area by the evening of the same day. It concentrated into a Depression and further 2.2 Post-monsoon season (October to intensified into a Deep Depression on 6th December 2018) September. It crossed West Bengal coast and moved north-westwards and weakened The post-monsoon season of 2018 was very gradually. Under the influence of the system, active with three cyclones formed over the Bay widespread and very intense rainfall activity of Bengal and one over the Arabian Sea. The occurred over Odisha. The system also caused tracks and the details about their genesis and widespread and intense rainfall activity over movement are shown in Figure 2 and Table 1 Chhattisgarh, Madhya Pradesh and East respectively. Rajasthan. During 6th to 12th September, the monsoon trough lay to the north of its normal 3. Significant Weather Events position and its eastern end extended across northeastern states on 10th and 11th. Also a north- 3.1 Monsoon season (June to September south trough in the lower tropospheric levels lay 2018) extending from eastern parts of Bihar to West Central Bay of Bengal, causing moisture During the monsoon season of 2018, heavy incursion into northeast and adjoining east India. rain, lightning and thunderstorm related Widespread intense rainfall activity occurred incidents were the most high impact weather over northeastern states and Sub-Himalayan events of the season which reportedly claimed West Bengal & Sikkim during this period. over 792 lives mostly from northern, eastern/north-eastern, central and north The last system formed as a Low Pressure Area peninsular parts of the country over East Central Bay of Bengal and adjoining Myanmar coast on 18th September evening. It Thunderstorm: Thunderstorm activities concentrated into a Depression over east central reportedly claimed 76 lives during the season Bay of Bengal and neighborhood during the mostly from different parts of the country. Of night of 19th. It then intensified further into these, 75 deaths were reported from Jharkhand Cyclonic Storm ‘DAYE’ over northwest Bay of during the month of June and July and one Bengal on 20th September and crossed south reportedly claimed died in Rajasthan. Odisha and adjoining north Andhra Pradesh coasts close to Gopalpur during mid-night of 21st Lightning: As per reports in local newspaper September, gradually weakened into a 114 people were struck & killed by lightning Depression and moved across central India upto from different parts of the country during the western parts of Madhya Pradesh on 21st and season. Out of 114 persons 39 were from 22nd September. During the traverse, it started districts of Uttar Pradesh, 22 persons from 99 VayuMandal 45(1), 2019 Figure 2: Cyclonic Disturbances (Cyclones during post-monsoon season 2018) Table 1. Genesis and movement of Tropical Cyclones over north Indian Ocean during post- monsoon season from October to December, 2018 S. No. System Period Genesis location and movement Very Severe Crossed Yemen and adjoining Oman coasts near 15.8ºN and Cyclonic 52.2ºE during 0530 to 0600 UTC of 14th Oct. 1 Storm, 6-15 ‘LUBAN’ October Weakened into a well-marked low pressure area over Yemen and adjoining Saudi Arabia at 0300 UTC of 15th. Very Severe crossed north Andhra Pradesh-south Odisha coasts, near Cyclonic Lat.18.8°N / Long. 84.5°E, during 2300 UTC of 10th and 0000 2 Storm 8-13 UTC of 11th Oct. Weakened into a well marked low pressure area “TITLI” October over Gangetic West Bengal and neighbourhood at 0000 UTC of 13th Oct. Very Severe Crossed Tamil Nadu and Puducherry coasts between Nagapattinam Cyclonic and Vedaranniyam near 10.450N and 79.80E during 1900 to 2100 3 Storm 10-19 UTC on 15th NOV.
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