Weather During the Week Ending On
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Government of India Ministry of Earth Sciences India Meteorological Department National Weather Forecasting Centre ALL INDIA WEEKLY WEATHER REPORT 16 SEPTEMBER – 22 SEPTEMBER, 2021 Go to:-Table-1(A) Table-1(B) Table-1(C) Table-2 Table-3 Fig-1 Fig-2 Annexure-1 SIGNIFICANT WEATHER FEATURES ♦ A Well Marked Low Pressure Area lay over central parts of north Madhya Pradesh and neighbourhood in the beginning of the week; it lay over northwest Madhya Pradesh & adjoining southwest Uttar Pradesh on 17th; it weakened into a Low Pressure Area and lay over northwest Madhya Pradesh & adjoining East Rajasthan on 18th and over central parts of East Rajasthan & adjoining West Madhya Pradesh on 19th; the Low Pressure Area has become less marked; however, its remnant cyclonic circulation in the lower tropospheric levels lay over East Rajasthan & neighbourhood on 20th & 21st and over West Rajasthan & neighbourhood towards the end of the week; this system along with the alignment of monsoon trough to the south of its normal position have caused fairly widespread to widespread rainfall/thunderstorm activity over East Rajasthan, West Madhya Pradesh and Gujarat Region on many days along with isolated heavy/very heavy rainfall during the week; isolated extremely heavy rainfall also had occurred over Gujarat region on one day towards the end of the week. ♦ Presence of the Low pressure system /its remnant cyclonic circulation over Northwest India & adjoining areas causing convergence of moist easterlies over the region and movement of Western Disturbance have caused scattered to fairly widespread rainfall/thunderstorm activity over Western Himalayan Region and isolated to scattered rainfall/thunderstorm activity over adjoining plains of Northwest India during the week; isolated heavy rainfall also had been reported over parts of Western Himalayan Region and Punjab on three to four days and over remaining parts of Northwest India on one or two days during the week. ♦ A cyclonic circulation extending upto midtropospheric levels and tilting southwestwards with height lay over Eastcentral Bay of Bengal & adjoining Myanmar coast in the beginning of the week; moving west-northwestwards, it lay over Eastcentral & adjoining Northeast Bay of Bengal on 17th; it lay over Northwest & adjoining Westcentral Bay of Bengal between 1.5 km & 5.8 km above mean sea level and tilting southwestwards with height on 18th and over Northwest Bay of Bengal and adjoining areas of north Odisha-West Bengal-Bangladesh coasts on 19th; it lay over Gangetic West Bengal & neighbourhood and extended upto midtropospheric levels in the forenoon of 20th; under its influence, a Low Pressure Area has formed over southern parts of Gangetic West Bengal & neighbourhood in the evening of the same day and it persisted over the same region on 21st with the associated cyclonic circulation extending upto mid tropospheric levels and tilting southwestwards with height; it lay over southeast Jharkhand & neighbourhood in the forenoon and over southwest Jharkhand and adjoining north Chhattisgarh in the evening of 22nd September 2021with the associated cyclonic circulation extending upto midtropospheric levels; this system has caused scattered to fairly widespread rainfall/thunderstorm activity over Odisha and Gangetic West Bengal on most of the days and over Jharkhand and Chhattisgarh on a few days along with isolated heavy rainfall activity over these areas on three to four days during the week; under its influence, isolated very heavy rainfall activity also had been reported over Gangetic West Bengal and Odisha on one or two days; under the influence of a trough in the lower tropospheric levels which lay extending from the cyclonic circulation associated with this Low pressure area to Telengna across interior Odisha and Chhattisgarh, widespread rainfall/thunderstorm activity along with isolated heavy rain had been reported over Telengana towards the end of the week. ♦ Under the influence of a cyclonic circulation over Tamil Nadu & neighbourhood and a north- south trough across south Peninsula in the lower tropospheric levels, scattered to fairly widespread rainfall/thunderstorm activity had occurred over Interior Karnataka with isolated heavy rainfall on a single day whereas isolated to scattered rainfall/thunderstorm activity along with isolated heavy rainfall on three to four days had occurred over Tamil Nadu, Puducherry & Karaikkal and Rayalseema during the second half of the week. Heavy rain: ♦ Heavy to very heavy rainfall with extremely heavy falls at isolated places had occurred over East Uttar Pradesh and Gujarat Region on one day each during the week. ♦ Heavy to Very heavy rainfall at isolated places had occurred over Assam & Meghalaya, Gangetic West Bengal, Odisha, East Rajasthan, East & West Madhya Pradesh, Konkan & Goa and Vidarbha on two days each; over Andaman & Nicobar Islands, Sub Himalayan West Bengal & Sikkim, Bihar, East & West Uttar Pradesh, West Rajasthan, Gujarat Region, Telengana, Tamil Nadu, Puducherry & Karaikkal on one day each during the week. ♦ Heavy rainfall at isolated places had occurred over Tamil Nadu, Puducherry & Karaikkal and West Madhya Pradesh on five days each; over Gangetic West Bengal, East Rajasthan, Saurashtra & Kutch and Chhattisgarh on four days each; over Nagaland, Manipur, Mizoram & Tripura, Odisha, Jharkhand, Uttarakhand, Punjab, Himachal Pradesh, Gujarat Region and Rayalseema on three days each; over Andaman & Nicobar Islands, Arunachal Pradesh, Sub Himalayan West Bengal & Sikkim, East Uttar Pradesh, West Rajasthan, Marathwada and Telengana on two days each; over Assam & Meghalaya, Bihar, West Uttar Pradesh, Haryana, Chandigarh & Delhi, Jammu Kashmir & Ladakh, East Madhya Pradesh, Konkan & Goa, Madhya Maharashtra, Vidarbha, Coastal Andhra Pradesh & Yanam, North & South Interior Karnataka and Kerala & Mahe on one day each during the week. Temperature Scenario: ♦The highest maximum temperature of 40.5oC had been recorded at Jaisalmer (West Rajasthan) on 17th September 2021 and the lowest minimum temperature of 17.2oC had been recorded at Nanded (Marathwada) on 16th September 2021 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 ♦ Last week’s Well Marked Low Pressure Area over central parts of north Madhya Pradesh and neighbourhood with the associated cyclonic circulation extending upto 5.8 km above mean sea level persisted on 16th September 2021; it lay over northwest Madhya Pradesh & adjoining southwest Uttar Pradesh with the associated cyclonic circulation extending upto 5.8 km above mean sea level on 17th; it has weakened into a Low Pressure Area and lay over northwest Madhya Pradesh & adjoining East Rajasthan with the associated cyclonic circulation extending upto 5.8 km above mean sea level on 18th;it lay over central parts of East Rajasthan & adjoining West Madhya Pradesh with the associated cyclonic circulation extending upto 5.8 km above mean sea level on 19th; the Low Pressure Area has become less marked; however, its remnant cyclonic circulation lay over East Rajasthan & neighbourhood and extended upto 4.5 km above mean sea level on 20th; it persisted over the same areas and extended upto 3.1 km above mean sea level on 21st; it lay over West Rajasthan & neighbourhood and extended upto 3.1 km above mean sea level on 22nd September 2021. ♦ The monsoon trough at mean sea level passed through Dwarka, Ahmedabad, centre of Well Marked Low Pressure Area over central parts of north Madhya Pradesh & neighbourhood, Sidhi, Daltonganj, Balasore and thence southeastwards to Eastcentral Bay of Bengal and extended upto 0.9 km above mean sea level on 16th September 2021; it passed through Phalodi, Ajmer, centre of Well Marked Low Pressure Area over northwest Madhya Pradesh & adjoining southwest Uttar Pradesh, Sidhi, Jamshedpur, Digha and thence southeastwards to Eastcentral Bay of Bengal and extended upto 0.9 km above mean sea level on 17th; it passed through Bikaner, centre of Low Pressure Area over northwest Madhya Pradesh & adjoining East Rajasthan, Satna, Daltonganj, Jamshedpur, Digha and thence southeastwards to Northeast Bay of Bengal on 18th; it passed through Jaisalmer, Ajmer, centre of Low Pressure Area over central parts of East Rajasthan & adjoining West Madhya Pradesh, Sidhi, Daltonganj and thence southeastwards to Northeast Bay of Bengal and extended upto 0.9 km above mean sea level on 19th; it passed through Bikaner, Kota, Nowgong, Gaya, Kolkata and thence southeastwards to Northeast Bay of Bengal in the forenoon of 20th and through Jaisalmer, Kota, Lalitpur, Rewa, Daltonganj, centre of Low Pressure Area over southern parts of Gangetic West Bengal & neighbourhood and thence southeastwards to Northeast Bay of Bengal in the evening of the same day; it passed through Jaisalmer, Kota, Guna, Sidhi, Ranchi, centre of Low Pressure Area over southern parts of Gangetic West Bengal & neighbourhood and thence southeastwards to Northeast Bay of Bengal on 21st; it passed through Jaisalmer, Jodhpur, Guna, Damoh, Ambikapur, centre of Low Pressure Area over southeast Jharkhand & neighbourhood, Balasore and thence southeastwards to Eastcentral Bay of Bengal in the forenoon of 22nd September 2021 and through Jaisalmer, Jodhpur, Guna, Jabalpur,centre of Low Pressure Area over southwest Jharkhand and adjoining north Chhattisgarh, Balasore and thence southeastwards to Eastcentral Bay of Bengal in the evening of the same day. ♦ Last week’s cyclonic