Govt. of India / भारत सरकार Ministry of Earth Sciences / पृ镍वी ववज्ञान मंत्रालय India Meteorological Department / भारत मौसम ववज्ञान ववभाग Regional Meteorological Centre /क्षेत्रीय मौसम कᴂद्र Guwahati – 781 015/ गुवाहाटी - ७८१०१५ Weekly Weather Report for Arunachal Pradesh, Assam& Meghalaya, Nagaland- Manipur-Mizoram & Tripura for week ending on 29.09.2021 Synoptic Feature: “Monsoon Trough” persisted and passed through Jaisalmer, Chittorgarh,Tikamgarh, Sidhi, Ambikapur, Jharsuguda,Puri and thence SE-wards to EC-Bay of Bengal on 23rd.It persisted and passed through Jaisalmer,Ajmer,Nowgong,Daltonganj,Jamshedpur,Digha and thence SE-wards to EC-Bay of Bengal on 24th.It persisted and passed through Jaisalmer, Kota, Mandla, Sambhalpur, Paradeep and thence ESE –wards to the centre of Deep Depression over NW & adjoining WC-Bay of Bengal on 25th.It persisted and passed through Bikaner,Kota,Sagar,Pendra Road,Jharsuguda and thence ESE-wards to the centre of Cyclonic Storm “Gulab” over Northwest & adjoining WC-Bay of Bengal on 26th.It persisted and passed through Jaisalmer,Udaipur,Akola,Chandrapur,centre of Deep depression over south Odisha & adjoining south Chattisgarh,Vishakapatnam and thence ESE- wards to EC-Bay of Bengal on 27th.The monsoon Trough at mean sea level has become disorganized on 28th. The Deep Depression over north and adjoining central Bay of Bengal moved westwards with a speed of 14 kmph in last 6 hours and lay centred at 0830 hrs IST of 25th September,over northwest and adjoining WC_Bay of Bengal near Lat.18.4°N and Long 89.3°E, about 470 km ESE of Gopalpur(Odisha) & 540 km ENE of Kalingapatnam(Andhra Pradesh).It is likely to intensify in to a Cyclonic Storm during next 06 hours. It is likely to move nearly westwards and cross north Andhra Pradesh-south Odisha coast between Vishakhapatnam & Gopalpur around Kalingapatnam by evening of 26th September. The Cyclonic Storm “Gulab”(pronounced as GulAab) over northwest and adjoining WC-Bay of Bengal moved nearly westwards with a speed of 17kmph in last 06 hours and lay centred at 0830 hrs IST of 26th September, over northwest and adjoining WC-Bay of Bengal near Lat.18.4°N and Long.86.4°E,about 180 km ESE of Gopalpur(Odisha) & 240 km ENE OF kalingapatnam(Andhra Pradesh).It is likely to move nearly westwards and cross north Andhra Pradesh-south Odisha coasts between Kalingapatnam & Gopalpur as a Cyclonic Storm with maximum sustained wind 75-85 kmph gusting to 95 kmph, around midnight of 26th September. The landfall process will commence from late evening of 26th . The Deep Depression over south Odisha and adjoining north Andhra Pradesh moved westwards with a speed of 08 kmph during last 06 hours, lay centred at 0830 hrs IST of 27th over south Odisha and adjoining south Chattisgarh near Lat.18.4°N and 82.5°E,about 90 km southeast of Jagdalpur(Chattisgarh) and 65 km ENE of Malkangiri(Odisha).It is likely to move nearly westwards and weaken in to a Depression during next 06 hours and in to a well marked LOPAR during subsequent 24 hours. The Deep depression over Telangana and adjoining areas of Marathwada & Vidarbha moved WNW-wards with a speed of 26kmph during last 06 hours and lay centred at 0830 hrs IST of 28th over Sw- vidarbha & N’Hood near Lat.19.4°N and Long.77.3°E, about 60KM ENE of Parbhani(Marathwada) and 250 km SW of Nagpur(Vidarbha). It is likely to move WNW-wards and weakened in to WMLOPAR during next 06 hours. The system is likely to emerge in to NE-Arabian sea & adjoining Gujarat coast around 30th and there is likelihood for the system to further intensify over NE-Arabian sea during subsequent 24 hours. The WMLOPAR over central parts of GWB lay over western parts of GWB and N’Hood and the associated CYCIR extended up to mid tropospheric level on 29th.The East-West Trough ran from the CYCIR associated with the WMLOPAR over South Gujarat region and adjoining Gulf of Khambhat to the CYCIR associated with the other WMLOPAR over western parts of GWB and N’Hood across M.P, Chattisgarh and Jharkhand extended up to 5.8 km amsl on 29th.The last week CYCIR over Myanmar coast & adjoining Gulf of Martaban persisted on 23rd.It is likely to move NW-wards emerged in to northeast & adjoining EC-Bay of Bengal and under its influence, a LOPAR is likely to form over the same region around 24th evening. It is likely to move WNW- wards towards Odisha coast during the subsequent 48 hours. Under the influence of the CYCIR ,a LOPAR formed over EC-Bay of Bengal & N’Hood on 24th.It is likely to move WNW-wards towards Odisha coast during next 48 hours.The last week CYCIR persisted and lay over South Chattisgarh & N”Hood extended up to 5.8 km amsl on 23rd .It persisted and lay over NE-Madhya Pradesh & adjoining south Uttar Pradesh extended up to 4.5 km amsl on 24th. A CYCIR is likely to emerge over NE & adjoining EC-Bay of Bengal around 27th and Under its influence, a LOPAR is likely to develop over NE-Bay of Bengal & N’Hood during subsequent 24 hours. It is likely to move NW-wards and reach West Bengal coast around 29th . It persisted on 27th. A CYCIR is likely to emerge over Northeast & adjoining EC-Bay of Bengal during next 24 hours. Under its influence, a LOPAR is likely to develop over NE-Bay of Bengal & N’Hood during subsequent 24 hours. It is likely to move northwestwards and reach West Bengal coast around 29th . Under the influence of the CYCIR over Northeast & adjoining EC-Bay of Bengal, a LOPAR formed over NW-Bay of Bengal & adjoining coastal areas of west Bengal with the associated CYCIR extended up to mid tropospheric levels. t is likely to become more marked during next 24 hours. Rainfall distribution and weather activity: 23.09.2021 to 29.09.2021: Available data indicates that moderate rain occurred at most places over Nagaland & Manipur ; light to moderate rain occurred at a few places over Arunachal Pradesh and light rain occurred at isolated places over Assam, Meghalaya & Mizoram and dry weather prevailed over Tripura on 23rd ; Available data indicates that moderate rain occurred at many places over Nagaland .and light to moderate rain at few places over Arunachal pradesh & Mizoram; light rain occurred at isolated places over Assam, Meghalaya and Manipur and dry weather prevailed over Tripura on 24th; Available data indicates that light to moderate rain occurred at isolated places over Assam, Meghalaya,Manipur , Nagaland & Tripura ; light rain at isolated places over Arunachal pradesh and dry weather prevailed over Mizoram on 25th; Available data indicates that light rain occured at isolated places over Arunachal pradesh & Assam; light to moderate rain occurred at few places over Nagaland & Mizoram; moderate rain occurred at many places over Meghalaya &Tripura ; and dry weather prevailed over Manipur on 26th;Available data indicates that light to moderate rain occurred at a few places over Arunachal Pradesh; at isolated places over Assam & Meghalaya; at many places over Nagaland, Manipur & Tripura and light rain occurred at many places over Mizoram with isolated heavy rain occurred over Tripura on 27th; Available data indicates that light to moderate rain occured at a few places over Arunachal pradesh, Assam, Meghalaya, nagaland, Manipur, Mizoram & Tripura on 28th; Available data indicates that light to moderate rain occured at a few places over Arunachal pradesh, Assam & Manipur ;at many places nagaland & Tripura ; at most places over Meghalaya & Mizoram with isolated heavy falls over Assam on 29th. (a) (b) Fig1: Weekly rainfall activity for (a) Met. Sub-divisionwise (b) Statewise No. of Districts showing rainfall activity in Met.Sub-Divisions Rainfall Week ending on 29th Sept’2021. Period from 1st June’2021 to 29th Category Sept ’2021. AP AM NMMT AP AM NMMT LE 0 0 1 0 1 1 E 0 0 0 2 1 0 N 0 0 6 2 15 9 D 4 12 10 11 17 18 LD 10 17 15 1 0 4 NR 2 3 0 0 0 0 Legend: AP- Arunachal Pradesh AM-Assam & Meghalaya NMMT- Nagaland-Manipur-Mizoram & Tripura LE: Large Excess: > 59 % E: Excess; +20% to +59 % N: Normal: 19% to - 19% D: Deficient: -20% to -59% LD: Large Deficient : -60% to -99% NR: No Rain: -100% Chief Amount of Rainfall (in cm) 23.09.21: KOHIMA 6 WOKHA 2 MOKOKCHUNG 1 KAMPUR 1 . 24.09.21: TUTING 3 UMIAM 2 CHANDEL 2 KOHIMA 2 ZUNHEBOTO 2 MANGKOLEMBA 2 LENGPUI 1 SHILLONG 1 ALONG AWS 1 ZIRO 1 25.09.21: SONAMURA 3 26.09.21: AGARTALA A/P 5 A D NAGAR 4 KOHIMA 3 WOKHA 3 LEMBUCHERA 2 SONAMURA 2 BISHALGARH 3 SHILLONG 2 TURA KVK 2 SHILLONG AWS 1 BAGHMARA 1 WILLIAMNAGAR 1 MOKOKCHUNG 1 BELONIA 1 KVK SOUTH 1 MAWKYRWAT ARG 1. 27.09.21: SABROOM 7 NONGSTOIN 4 NONGSTOIN(AWS) 4 CHURACHANDPUR 3 AMARPUR 3 BELONIA 3 SONAMURA 2 SONAMURA(ARG) 2 MAJBAT 2 DHARAMTUL 2 KVK SOUTH 2 MAZBAT(ARG) 2 KHLIEHRIAT 2 LAMPHLEPAT( AGRI) 2 ZIRO 2 BELONIA(ARG) 1 BISHNUPUR 1 IMPHAL A/P(AWS) 1 TUENSANG 1 BISHALGARH 1 MOIRANG(ARG) 1 CHANDEL 1 MAWPHLANG 1 MAWSYNRAM 1 J B GAON 1. 28.09.21: LAWNGTLAI 5 SUALKUCHI(ARG) 5 N GHT COLLEGE(ARG) 5 IIT GUWAHATI(ARG) 5 SONAMURA 4 GUWAHATI (ARG) 4 GUWAHATI (CITY) 4 SONAMURA(ARG) 4 J B GAON 3 TIHU(ARG) 3 JIA BHARALI N T XING 3 MOTUNGA 3 MUSHALPUR(AWS) 3 KAMPUR 3 BEKI-MATHANGURI 2 MIRZA CIRCLE OFFICE(ARG) 2 KAMALPUR 2 HAZUWA 2 BAHALPUR 2 KHETRI(ARG) 2 CHHAMONU 2 TAWANG 2 BAITHALGHANSU 2 WILLIAMNAGAR 2 BARAPANI 1 GUWAHATI A/P 1 GUWAHATI A/P(AWS) 1 KVK SOUTH 1 BHOMORAGURI 1 HAZO(ARG) 1 HAWAI 1 ZIRO 1 CHANDRAPUR(ARG) 1.