Weekly Weather |

Severe Cold wave conditions prevailed over parts of Northwest India.

Last week’s Western Disturbance as cyclonic circulation over Afghanistan and adjoining Pakistan moved eastwards. It was over north Pakistan and adjoining Jammu & Kashmir on 17th December and became less marked on the 18th. This induced cyclonic circulation over West Rajasthan & neighbouring areas on 14th and became less marked on 15th. Due to this system rain/snow occurred at many places over Jammu & Kashmir and Himachal Pradesh between 0830 hours IST of 13th and 0830 hours IST of 14th and at isolated places between 0830 hours IST of 14th and 0830 hours IST of 15th December. Last week’s cyclonic circulation over Sri Lanka & neighbouring areas moved westwards to Maldives-Lakshadweep area. Due to this system rainfall occurred at many places over Kerala; at a few places over Lakshadweep and at isolated places over Tamilnadu & Puducherry between 0830 hours IST of 13th and 0830 hours IST of 14th December. A fresh feeble Western Disturbance as a trough in mid-tropospheric westerlies on 18th &19th and as a cyclonic circulation over East Afghanistan & neighbouring areas with trough aloft roughly along Longitude 68.0°E to the north of Latitude 25.0°N on 20th. Due to this system light rain/snow at many places over Jammu & Kashmir. During the week, the lowest minimum temperature of 1.2°C was recorded at Bhatinda (Punjab) in the plains of the country on 16th December 2017. During the week lowest maximum temperature of 12.0°C was recorded at Karnal (Haryana) on 14th December and at Bhatinda (Punjab) on 15th December 2017 in the plains of the country. Severe Cold wave conditions prevailed at many places over Punjab & Haryana and at isolated places over West Uttar Pradesh West Rajasthan on 14th and Cold wave conditions at most places over West Rajasthan, Punjab, Jammu division of Jammu & Kashmir and Severe Cold wave conditions prevailed at a few places over north Rajasthan & Haryana on 15th. Severe Cold wave conditions prevailed at isolated places over Haryana and north Rajasthan and Cold wave conditions at isolated places over Haryana and north Rajasthan on 15th. Severe cold wave conditions prevailed at isolated places in Telangana on 20th. Dense to very dense fog (visibility ≤ 200m) occurred on a few days of the week over Assam & Meghalaya, Manipur, Tripura, Bihar, Odisha, Punjab, Haryana, Chandigarh & Delhi and on one/two days of the week over Uttar Pradesh, Himachal Pradesh, Jammu & Kashmir, Madhya Pradesh, Rajasthan, Sub-Himalayan West Bengal & Sikkim, south-Madhya Maharashtra. During the week, northeast Monsoon was weak. All the Sub-Divisions of India received large deficient/ no rainfall except Kerala which received excess rainfall.  
During the week, rainfall over the country as a whole was 79 per cent below the long period average (LPA). All the four broad homogeneous regions of India received largely deficient rainfall. Details of the rainfall distribution over the four broad homogeneous regions of India are given below:  
REGIONS ACTUAL RAINFALL (MM) NORMAL RAINFALL (MM) % DEP. FROM LPA
COUNTRY AS A WHOLE 0.6 3.0 -79%
NORTHWEST INDIA 1.2 3.9 -69%
CENTRAL INDIA 0.0 1.0 -99%
SOUTH PENINSULA 1.3 5.5 -77%
EAST & NORTHEAST INDIA 0.1 3.0 -98%
 SEASONAL ALL INDIA COUNTRY AS A WHOLE (1ST OCTOBER TO 20th DECEMBER 2017) For the country as a whole, cumulative rainfall was (-08 per cent) of LPA as on 20th December 2017. Cumulative rainfall was deficient over northwest India. Rainfall was excess/normal over the most of sub-divisions of east & northeast India and the southern peninsula and few sub-divisions of central India. Details of the rainfall distribution over the four broad homogeneous regions of India are given below:
REGIONS ACTUAL RAINFALL (MM) NORMAL RAINFALL(MM) % DEP. FROM LPA
COUNTRY AS A WHOLE 112.1 121.3 -8%
NORTHWEST INDIA 26.4 51.6 -49%
CENTRAL INDIA 72.3 78.2 -8%
SOUTHERN PENINSULA 242.4 267.0 -9%
EAST & NORTHEAST INDIA 200.9 166.2 21%
DELHI MUMBAI KOLKATA CHENNAI SRINAGAR LUCKNOW GUWAHATI AHMEDABAD NAGPUR HYDERABAD BENGALURU THIRUVANANTHAPURAM

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