GOVERNMENT OF Ministry of Earth Sciences भारत सरकार India Meteorological Department पृथ्वी विज्ञान मंत्रालय Meteorological Centre, Anisabad, भारत मौसम विज्ञान विभाग Patna, Pin Code:-800002 मौसम विज्ञान कᴂद्र ,अवनसाबाद E-mail : [email protected], पटना वबहार , वपन 800002 [email protected] ई-मेल:[email protected], [email protected]

Date of Issue: -04.10.2021 Weekly Weather Report for Bihar

WEEKLY WEATHER REPORT DURING THE WEEK ENDING ON 03.10.2021 (27.09.2021 TO 03.10.2021)

SIGNIFICANT SINOPTIC FEATURES

 DATE: 27.09.2021  The Monsoon trough at mean sea level now passes through Jaisalmer, Udaipur, Akola, Chandrapur, center of Deep Depression over south Odisha &  adjoining south Chhattisgarh, Vishakhapatnam and thence east-southeastwards to East central Bay of Bengal.  The cyclonic circulation over East central & adjoining Northeast Bay of Bengal off Myanmar coast extending up to mid-tropospheric levels persists.  An east-west trough runs from north Konkan to cyclonic circulation associated with deep depression over south Odisha & adjoining south  Chhattisgarh and extends up to 5.8 km above mean sea level.

 DATE: 28.09.2021  Under the influence of the cyclonic circulation over Northeast & adjoining East-central Bay of Bengal, a Low Pressure Area has formed over  Northwest Bay of Bengal & adjoining coastal areas of West Bengal. The associated cyclonic circulation extends up to mid-tropospheric levels. It is  likely to become more marked during next 24 hours.  The east-west trough now runs from north Konkan to cyclonic circulation associated with Depression over southwest Vidarbha &  neighborhood to north Coastal Andhra Pradesh between 1.5 & 5.8 km above mean sea level.

 DATE: 29.09.2021  The Well Marked Low Pressure Area over north Madhya Maharashtra and adjoining Gujarat region & southwest Madhya Pradesh now lies over south  Gujarat region and adjoining Gulf of Khambhat and the associated cyclonic circulation extends up to mid- tropospheric levels. It is likely to move  west-northwestwards, emerge into Northeast Arabian Sea & intensify into a Depression by tomorrow, the 30th September 2021, morning. Then it is  very likely to move further west-northwestwards and intensify into cyclonic storm during the subsequent 24 hours. Thereafter it is likely to continue to  move west north westwards close to Pakistan -Mekran coasts, moving away from the Indian coast.  The east west trough now runs from cyclonic circulation associated with the Well-Marked Low Pressure Area over south Gujarat region and adjoining  Gulf of Khambhat to the cyclonic circulation associated with the other Well Marked Low Pressure Area over western parts of Gangetic West Bengal  and neighborhood across Madhya Pradesh, Chhattisgarh and Jharkhand and extends up to 5.8 km above mean sea level.

 DATE: 30.09.2021  The Well Marked Low Pressure Area over northwest Jharkhand & neighborhood now lies over north Jharkhand & adjoining Bihar and the associated  cyclonic circulation extends up to 7.6 km above mean sea level.  A trough in easterly runs from Southeast Bay of Bengal to south Andhra Pradesh coast and extends up to 3.1 km above mean sea level.  The east-west trough from cyclonic circulation associated with the depression over northeast Arabian Sea & adjoining Kutch to the cyclonic  circulation associated with the Well-Marked Low Pressure Area over northwest Jharkhand & neighborhood across Madhya Pradesh extending up to  5.8 km above mean sea level has become less marked.  DATE: 01.10.2021  The Monsoon trough at mean sea level now passes through Jaisalmer, Ajmer, Nowgong, Daltonganj, a cyclonic circulation lies over central parts of south Bay of Bengal and extends up to 3.1 km above mean sea level.  The Well Marked Low Pressure Area over southwest Bihar & neighborhood has weaken into a Low Pressure Area over southwest Bihar & neighborhood and the  associated cyclonic circulation extends up to 7.6 km above mean sea level.  The trough in easterly from Southeast Bay of Bengal to south Andhra Pradesh coast now runs from cyclonic circulation over central parts of south Bay of Bengal to  Tamilnadu coasts and extends up to 3.1 km above mean sea level.  DATE: 02.10.2021  The Low Pressure Area over southwest Bihar & neighborhood now lies over west Bihar & adjoining East Uttar Pradesh and the associated cyclonic circulation extends up to 7.6 km above mean sea level.  The cyclonic circulation over central parts of south Bay of Bengal now lies over southwest Bay of Bengal and extends up to 5.8 km above mean sea level tilting  DATE: 03.10.2021

 The Low Pressure Area over west Bihar & adjoining East Uttar Pradesh now lies over central parts of Bihar & neighborhood. The associated cyclonic circulation now extends up to 4.5 km above mean sea level.  A north-south trough runs from the above Low Pressure Area over central parts of Bihar & neighborhood to north interior Odisha across Jharkhand and extends up to 4.5 km above mean sea level. RAINFALL SUMMARY

DATE CHIEF AMOUNTS OF RAINFALL ( IN MM) 27th SEPTEMBER Barbigha-36.6,Bodhgaya-20.0,Jhajha-19.8,Katoria-17.8,Aurangabagh-12.4,Bhore-11.2 etc. Siswan-51.6, Jhajha-42.0, Pachrukhi-32.8, Sabour-32.4 Bhagalpur-32.2, Araria-31.0, Jandaha-30 th 28 SEPTEMBER etc. Baunsi-60.4, Dhengraghat-48.2, Tekari-33.6, Umar Khand -31.6, Dharhara & Araria-27.0, Barari- th 29 SEPTEMBER 26.2, Purnea-24.6, Forbesganj-24.5 etc. 30th SEPTEMBER Chandan-61.2 , Jhajha-57.6, Sono-52.6, Rajauli-48.5, Katoria-35.8 etc.

ARYARI-178.6, SHEIKHPURA-145.4, KAUWAKOL-144.2, BARBIGHA-138.6, CHANDAN-122.2, st 01 OCTOBER CHEWARA-118.6, JHAJHA-117.6, PACHRUKHI-100.6 etc. Bairia-233.5, Chanpatia-147.4, Narhat-146.8, Mahua-145.2, Dumraghat-140.0, Chatia-138.4, nd 02 OCTOBER Hathwa-126.4, Gopalganj-119.6, Buxar-117.5, Mushari-113.8 etc. THAKURGANJ-210.0, DARAULI-167.0, TAIBPUR-142.6, BELSAND-133.8, SAULIGHAT-130.0, rd 03 OCTOBER PUSA-120.6, NIRMALI- 116.8, HATHWA-103.8, BAHADURGANJ-102.2, BENIBAD-102.0, JALEY-98.2 etc.

 SPATIAL DISTRIBUTION OF RAINFALL:

DATE→ 27thSEPTEMBER 28thSEPTEMBER 29thSEPTEMBER 30thSEPTEMBER 01st OCTOBER 02nd OCTOBER 03rd OCTOBER BIHAR SECTOR↓ NORTH FWS ISOL SCT WS WS WS SCT WEST NORTH FWS SCT SCT WS WS WS FWS CENTRAL NORTH FWS FWS SCT SCT WS WS FWS EAST SOUTH ISOL ISOL ISOL WS WS WS FWS WEST SOUTH FWS FWS FWS WS WS WS FWS CENTRAL SOUTH FWS FWS FWS WS WS WS WS EAST

 Temperature Scenario:

 The highest maximum temperature of 38.2 degree Celsius had been recorded at Sitamarhi on 27.09.21 and the lowest minimum temperature of 20.0 degree Celsius had been recorded at Dehri on 01.10.21 over the plains of the state during the week.