Government of India Ministry of Earth Sciences India Meteorological Department Regional Weather Forecasting Centre Nagpur REGIONAL WEEKLY WEATHER REPORT 12 - 18 JULY 2018 SIGNIFICANT WEATHER FEATURES Monsoon Activity • A low pressure area formed over the North-West Bay of Bengal in the beginning of the week and has moved westnorthwestwards across the central parts of the country. A mid troposphere cyclonic circulation lay over Gujarat and neighbourhood throughout the week. The monsoon trough had been very active and has remained south of its normal position tilting southwards with height on many days during the week. Under the influence of these systems, intense rainfall activity has been observed over central India and along the west coast. • Southwest monsoon had been vigorous over Saurashtra & Kutch for three days and over Kerala and Odisha on one day each. It had been active over Gujarat Region and South Interior Karnataka and Madhya Maharashtra on most of the days; over Chhattisgarh, Kerala, Madhya Pradesh, Coastal Andhra Pradesh, Saurashtra & Kutch, Odisha and Vidarbha on three to four days;over Telangana, Marathwada, Haryana, Chandigarh & Delhi, Jammu & Kashmir, Himachal Pradesh, East Rajasthan, Uttarakhand and Konkan & Goa on one or two days during the week. Heavy Rainfall Activity • Heavy to very heavy rain with extremely heavy falls at one or two places had been reported from Gujarat Region and Saurashtra & Kutch on four days each, from Odisha, Konkan & Goa, Madhya Maharashtra and Kerala on one or two days each during the week. • Heavy to Very heavy rain had been reported from South Interior Karnataka on five days, from Konkan & Goa, Madhya Maharashtra, East and West Madhya Pradesh and Gujarat Region on three to four days, from Kerala, East Rajasthan and East Uttar Pradesh on two days each and from Saurashtra & Kutch, Uttarakhand, West Uttar Pradesh, Chattisgargh, Punjab, Himachal Pradesh, Vidarbha, Odisha and Chattisgarh on one day each during the week. Temperature The highest maximum temperature of 43.8 0 C was recorded at Phalodi (West Rajasthan) over the plains of the country during the week. • • LEGEND: A Few days- 3 days, Many days- 4 to 5 days and Most days- 6 to 7 days during the week. METEOROLOGICAL ANALYSIS • The axis of monsoon trough at mean sea level passed through Anupgarh, Jhunghunu, Shivpuri, Sidhi, Pendra, Chaibasa, Digha and thence eastsoutheastwards to East Central Bay of Bengal and extended upto 0.9 km above mean sea level on 12 th July 2018. It passed through Anupgarh, Sikar, Gwalior, Sidhi, Ambikapur, Chaibasa, Balasore, centre of low pressure area overNnorthWest Bay of Bengal & neighbourhood and thence southeastwards to north Andaman Sea and extended upto 0.9 km above sea level on 13 th ; passed through Bikaner, Ajmer, Guna, Rewa, Ambikapur, Rourkela, Balasore, centre of low pressure area over NorthWest Bay of Bengal & neighbourhood and thence southeastwards to north Andaman Sea on 14 th ; passed through Bikaner, Ajmer, Guna, Damoh, Ambikapur, Jharsiguda and centre of well marked low pressure area over NorthWest Bay of Bengal & adjoining Odisha and thence southeastwards to EastCentral Bay of Bengal and extended upto 1.5 km above mean sea level on 15 th ; passed through Jaisalmer, Kota, Sagar, Ambikapur, Jharsiguda , the centre of well marked low pressure area over north Coastal Odisha & neighbourhood and thence southeastward to EastCentral Bay of Bengal and extended upto 2.1 km above mean sea level tilting southwards with height on 16 th ; passed through Jaisalmer, Kota, Sagar, Umaria, centre of well marked low pressure area over north Chhattisgarh & neighbourhood, Baripada and thence east southeastwards to NorthEast Bay of Bengal and extended upto 2.1 km above mean sea level tilting southwards with height on 17 th and passed through Bikaner, Ajmer, Shivpuri, centre of low pressure area over East Madhya Pradesh & adjoining southeast Uttar Pradesh and Chhattisgarh, Ambikapur, Balasore and thence southeastwards to north Andaman Sea and extended upto 1.5 km above mean sea level on 18 th . • Last week’s cyclonic circulation over northeast Madhya Pradesh & neighbourhood lay over central parts of south Uttar Pradesh and extended upto 1.5 km above mean sea level on 12 th July 2018. It persisted over the same region and extended upto 3.1 km above mean sea level on 13 th ; It continued to persist over the same region and extended upto 2.1 km above mean sea level on 14 th and it has merged with monsoon trough on 15 th July 2018. • Last week’s cyclonic circulation over north coastal Odisha & neighbourhood persisted and extended upto 5.8 km above mean sea level tilting southwestwards with height on 12 th July 2018. Under its influence a low pressure area formed over NorthWest Bay of Bengal & neighbourhood with associated cyclonic circulation extending upto 7.6 km above mean sea level tilting southwestwards with height on 13 th ; the low pressure area persisted over the same region with the associated cyclonic circulation extending upto 9.5 km above mean sea level tilting southwestwards withheight on 14 th . It lay as a well marked low pressure area over the same region with the associated cyclonic circulation extending upto 9.5 km above sea level tilting southwestwards with height on 14 th night; It lay over NorthWest Bay of Bengal and adjoining Odisha with the associated cyclonic circulation extending upto 9.5 km above sea level along with southwestward tilt with height on 15 th ; lay over north coastal Odisha and neighbourhood on 16 th with the extention of the associated cyclonic circulation upto 9.5 km above mean sea level with southwestward tilt with height continuing on 16 th ;lay over north Chhattisgarh & neighbourhood with associated cyclonic circulation extending upto 7.6 km above mean sea level tilting southwestwards with height on 17 th .It lay over East Madhya Pradesh & adjoining southeast Uttar Pradesh and Chhattisgarh with associated cyclonic circulation extending upto 7.6 km above mean sea level on 18 th July 2018. • Last week’s east-west shear zone ran roughly along latitude 20°N between 4.5 & 7.6 km above mean sea level tilting southwards with height on 12 th July 2018 and has become disorganised on 13 th July 2018. • Last week’s offshore trough at mean sea level off Karnataka-Kerala coasts persisted on 12 th & 13 th July 2018. It ran from north Maharashtra coast to Kerala coast on 14 th and has become less marked on 15 th . • Last week’s cyclonic circulation over south Gujarat & neighbourhood persisted and was seen between 3.1 & 3.6 km above mean sea level on 12 th July 2018. It persisted over the same region and was seen between 2.1 & 5.8 km above mean sea level tilting southwards with height on 13 th . It lay between 2.1 & 3.6 km above mean sea level over the same region on 14 th ; it was seen over the same region extending between 2.1 km & 5.8 km above mean sea level on 15 th ; It lay over Gujarat region and neighbourhood and extended between 3.1 km & 7.6 km above mean sea level tilting southwestwards with height on 16 th ; lay over south Gujarat and neighbourhood and extended between 3.1 km & 7.6 km above mean sea level with southwestward tilt with height on 17 th and lay over south Gujarat and adjoining NorthEast Arabian Sea and extended between 3.1 km & 7.6 km above mean sea level on 18 th . • Last week’s cyclonic circulation over south Pakistan and adjoining West Rajasthan between 1.5 km & 2.1 km above mean sea level has become less marked on 12 th July 2018. • Last week’s cyclonic circulation at 7.6 km above mean sea level over south Coastal and adjoining Interior Karnataka became less marked on 12 th July 2018. • A cyclonic circulation at 1.5 km above mean sea level lay over north Chhattisgarh and neighbourhood on 13 th & 14 th July 2018 and it has merged with monsoon trough on 15 th July 2018. • A cyclonic circulation at 3.1 km above mean sea level lay over West Uttar Pradesh and adjoining Haryana on 14 th July 2018 and it has become less marked on 15 th . • A cyclonic circulation extending upto 1.5 km above mean sea level lay over east Assam and neighbourhood on 14 th July 2018. It lay over Arunachal Pradesh and extended upto 2.1 km above mean sea level on 15 th and it has become less marked on 16 th July 2018. • A Western disturbance as a cyclonic circulation lay over Jammu & Kashmir at 3.1 Km above mean sea level with a trough aloft with the axis at 5.8 Km above mean sea level roughly along Long. 73°E to the north of Lat. 34°N on 16 th . It lay as a cyclonic circulation over eastern parts of Jammu & Kashmir between at 3.1 Km & 4.5 Km above mean sea level however the associated trough aloft with the axis at 5.8 Km above mean sea level has become less marked on 17 th . The Western Disturbance has moved away northeastwards in the evening of 17 th . 3 • A cyclonic circulation lay over north interior Tamil Nadu & neighbourhood at 7.6 km above mean sea level on 18 th July 2018. • A feeble offshore trough at mean sea level ran from south Maharashtra coast to Kerala coast on 18 th July 2018. METEOROLOGICAL SUB-DIVISIONWISE DISTRIBUTION OF REALISED RAINFALL-2018 S.No. MET.SUB-DIVISIONS 12 JUL 13 JUL 14 JUL 15 JUL 16 JUL 17 JUL 18 JUL 19 WEST MADHYA PRADESH WS * WS WS FWS * SCT FWS * FWS 20 EAST MADHYA PRADESH WS WS * FWS * FWS FWS WS * WS * 26 VIDARBHA WS * WS FWS FWS WS * WS * WS 27 CHHATTISGARH FWS WS * WS * FWS WS * WS * FWS LEGENDS: WS WIDE SPREAD / MOST PLACES (76-100%) FWS FAIRLY WIDE SPREAD / MANY PLACES (51% to 75%) SCT SCATTERED / FEW PLACES (26% to 50%) ISOL ISOLATED (up to 25%) D/DRY NO STATION REPORTED RAINFALL 1/ * ACTIVE (R/F 1 2- 4 times the normal with WS/FWS, at least 2 stations should be 5 cm.