Monsoon Report 2017
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MONSOON REPORT 2017 WATER RESOURCES DEPARTMENT GOVERNMENT OF RAJASTHAN INDEX S. No. Particulars Page No. 1 Rainfall Status of Monsoon Year – 2017 1 2 Introduction 2-3 3 IMD and its Long Range Forecast for 2017 4 4 Salient features of monsoon 2017 5-28 5 Annexures 29-85 Rainfall A District wise status of rainfall (Year 2017) 29 B Tehsil wise status of rainfall 30-37 District wise monthly average rainfall with deviation from C 38-39 normal (Year 2017) District wise monthly average rainfall with deviation from D 40-41 normal (Year 2013-17) E Maximum one day rainfall (100mm and above) 42-47 Storage Status of total water storage as on 30th September for tanks F 48 having capacity more than 4.25 MCUM (Year 1990-2017) Abstract of fully filled , partially filled and empty tanks G 49 (Year 2013-17) Gauge and capacity of tanks on 30th September having H 50-61 capacity above 4.25 MCUM (Year 2013-17) Gauge and capacity of tanks on 30th September having I 62-75 capacity below 4.25 MCUM (Year 2013-17) District wise position of over flown tanks during monsoon, J 76-84 2016 & 2017 K Year wise position of over flown tanks (2003 to 2017) 85 6 Conclusion 86 MONSOON 2017 Ü GANGANAGAR HANUMANGARH CHURU BIKANER JHUNJHUNU ALWAR SIKAR BHARATPUR NAGAUR JAISALMER JAIPUR DAUSA JODHPUR DHAULPUR KARAULI AJMER TONK SAWAI MADHOPUR BARMER PALI BHILWARA BUNDI RAJSAMAND KOTA JALORE BARAN CHITTAURGARH SIROHI CHITTAURGARH UDAIPUR JHALAWAR PRATAPGARH DUNGARPUR BANSWARA Legend District_Layer Category AbNormal Deficit Excess Normal Introduction The present report on the 2017 South-West monsoon season is prepared and published by Water Resources Department, Rajasthan that brings out detailed analysis of monitoring and forecasting aspects of the southwest monsoon. This report discusses about spatial and temporal variability of the rainfall, important features of rainfall and tank gauge, peculiarities of the pattern, onset ,advancement and withdrawal of the monsoon during the season. Over all, this report provides useful and authentic information about the 2017 south- west monsoon season for operational forecasters, researchers and other users. Our heartfelt gratitude to Indian Meteorological Department (IMD) for providing us information related to monsoon on time. 2 Copyright © Water Resources Department, Rajasthan 2017 The right of publication in print, electronic or any other form is reserved with the Water Resources Department, Rajasthan. Short extracts may be reproduced, however the source should be clearly indicated. DISCLAIMER & LIMITATIONS • The contents published in this report have been checked and authenticity assured within limitations of human errors. • Water Resources Department, Rajasthan is not responsible for any errors and omissions. • The geographical boundaries shown in this report do not necessarily correspond to the political boundaries. 3 Indian Meteorological Department (IMD) LONG RANGE FORECAST BY IMD FOR 2017 IMD forecast method The update forecast for the southwest monsoon season (June-September) rainfall over the country as a whole is issued using following Parameter Ensemble Forecasting System. • NE Pacific to NW Atlantic SST Anomaly Gradient (December + January), • Southeast Equatorial Indian Ocean Sea Surface Temperature (February), • East Asia Mean Sea Level Pressure (February + March), • Central Pacific (Nino 3.4) Sea Surface Temperature Tendency (March to May - December to February), • North Atlantic Mean Sea Level Pressure (May) and North Central Pacific 850 Zonal Wind gradient (May). Terminology used by I.M.D. in weather bulletins (a ) Intensity of Rainfall 1. 0.1 mm - 07.5 mm In 24 hrs Light Rain 2. 07.6 mm-35.5 mm In 24 hrs Moderate Rain 3. 35.6 mm-64.4 mm In 24 hrs Rather Heavy Rain 4. 64.5 mm-124.4 mm In 24 hrs Heavy Rain 5. Exceeding 124.4 mm In 24 hrs Very Heavy Rain (b) Spatial distribution of Weather phenomenon (Percentage Area Covered) S. No. Percentage Terminology Used 1. 01 to 25 Isolated 2. 26 to 50 Scattered 4. 51 to 75 Fairly Wide Spread 5. 76 to 100 Wide Spread (c) Category S. No. Category 1. Abnormal 60% or more 2. Excess 20% to 59% 3. Normal 19% to (-)19% 4. Deficit (-)20% to (-)59% 5. Scanty (-)60% or less 4 Salient Features Of Monsoon 2017 Monsoon 2017 was different in many sense and this chapter will describe it’s special features, events that took place, impacts in the vulnerable areas, challenges and success story of the department Onset and advancement of Monsoon Progress of South west monsoon 2017 (source: www. imd.gov.in) • First week of May 2017- The heating of land mass and moisture availability in the lower troposphere led to convection over major parts of India. • Since 13th May 2017- Enhancement of convection over Andaman region Persistent cloudiness and rainfall over the region. 5 • 14th May 2017- Advancement of Southwest monsoon (SWM) into some parts of southeast Bay of Bengal, Nicobar Islands, entire south Andaman Sea and parts of north Andaman sea. • Mid may- Monsoon reached Bay of Bengal and Andaman sea • End of may - Severe Cyclonic Storm (SCS) ‘Mora’ conditions over the Bay of Bengal • 30th May- Advancement of SWM over Kerala nd • 2 June- Advancement in Arunachal Pradesh, Nagaland, Manipur, Mizoram and most parts of Tripura and Assam & Meghalaya • Mid June- The formation of first intense low pressure system as a Deep Depression over North Bay of Bengal and its northward movement during 11th – 12th June accelerated the monsoon westerlies. Onset of monsoon in Rajasthan • Third week of June- The stronger than normal cross equatorial flow over the Bay of Bengal, increase in north-south pressure gradient and establishment of Tibetan High in its normal position, led to the increased rainfall over the core monsoon zone. This led to further advance of SWM over most parts of central and western India by 27th June. It covered remaining parts of north Arabian Sea, Saurashtra & Kutch, Gujarat region, some more parts of Madhya Pradesh and some parts of south Rajasthan by 27thJune. • July 2017- Seasonal trough along the northern plains gradually shifted northwards, due to a Western Disturbance which caused widespread precipitation over parts of northwest India. This led to a weak monsoon pattern, with an anomalous anticyclone prevailing over western India causing a prolonged hiatus of 8 days. As the trough became active and a well-marked low pressure area formed over Indo-Gangetic plains, SWM advanced into remaining parts of Himachal Pradesh and Jammu & Kashmir and some more parts of east Rajasthan, Haryana and some parts of Punjab on 12th July. Further, with the subsequent advance on 14th, 17th and 18th, it advanced into remaining parts of west Rajasthan, Haryana and Punjab on 19th and thus covering the entire country on 19th July 2017. 6 PERFORMANCE There was wide variation of rainfall this monsoon season. Central and western part of Rajasthan received normal and abnormal rainfall whereas eastern part of Rajasthan received deficit rainfall. Flood/ Flood like situations occurred in Sirohi, Jalore, Pali, Barmer and some areas of Jodhpur. The annual normal rainfall of the State is 594.9 mm. out of which 75 to 95 % of the rainfall mostly precipitates in the monsoon period i.e. from 1st June to 30th September. The normal rainfall of the State for the monsoon period is 530.1 mm. The average rainfall received in monsoon period in the State during last 15 years i.e. 2003 to 2017 is as under:- 800 700 600 500 400 District Average Rainfall 300 200 100 0 2003 2005 2007 2009 2011 2013 2015 2017 • Status of districts as per rainfall received Category Number of districts Abnormal (60% or more) 4 Excess (20 to 50% ) 6 Normal (19 to -19%) 9 Deficit (-20 to -59%) 14 Scanty (-60% or less) 0 7 Peculiarities of Monsoon 2017 • Mt Abu’s (District Sirohi) received maximum rainfall i.e. 773 mm in a day on 24th July, 2017. It is Rajasthan’s highest ever rainfall in a day in last 100 years. Also, this is District Sirohi’s maximum one day rainfall ever. Furthermore, Mt Abu received 773 mm rainfall (on 24th July, 2017), 733.6 mm (on 25th July, 2017) and 324 mm (on 26th July, 2017), thereby total of 1830.6 mm rain in 72 hours. • Intensity of rainfall was so tremendous in eastern Rajasthan that thirteen number of gates of Jawai dam, District Pali (Total 16 no. of gates) were opened altogether. It has happened for the first time in the history of Rajasthan that so many gates were opened at a single time only. • In terms of percentage of water, state receives 68.5% in tanks. • 241 numbers of tanks were fully filled out of 831 tanks. Furthermore, state received rainfall intensity of as high as 773 mm one day rainfall at few places and more than 250 mm one day rainfall at 22 number of stations (Annexure E). • State of Rajasthan received erratic rainfall. As per IMD, western part of the state received excess rainfall whereas eastern part of the state received normal rainfall. • Average rainfall received for western districts of Rajasthan (10 in number) is 498.71 mm. It is maximum in last 100 years. 8 • Withdrawal of monsoon 2017 Isochrones of withdrawals of South west monsoon 2017 (source: www. imd.gov.in) • Dry weather prevailed over western parts of Rajasthan since 18th September. However, the changeover of atmospheric circulation was delayed. Establishment of an anti-cyclone in the lower tropospheric levels, substantial reduction in moisture content and prevalence of dry weather indicated the withdrawal of southwest monsoon from some parts of Punjab, Haryana, most parts of west Rajasthan, some parts of Kutch and north Arabian Sea on 27th September. It further withdrew from remaining parts of Punjab, Haryana, Chandigarh & Delhi, west Rajasthan, Kutch, entire Jammu & Kashmir, Himachal Pradesh, some parts of Uttarakhand, west Uttar Pradesh, most parts of east Rajasthan, some parts of west Madhya Pradesh, north Gujarat region, Saurashtra and some more parts of north Arabian Sea on 30th September.