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Weekly Weather Update (30 November-06 December 2017)

 Very  Severe  Cyclonic  Storm  “OCKHI” Last  week’s  depression  which  crossed  the Sri  Lankan  coast  about  70  km  northeast  of  Hambantota  around  0930  hours  IST  and  intensified  into  a  deep  depression  and  lay  centered  at  0230  hrs  IST  of  30th  November,  2017  over  Comorin  area,  intensified  into  a  cyclonic  storm  ‘OCKHI’  and  lay  centered  at  0830  hrs  IST  over  Comorin  area.  It  moved  west-northwestwards  towards  southeast  Arabian  Sea  and  intensified  into  a  severe  cyclonic  storm  and  intensified  into  a  Very  Severe  Cyclonic  Storm  around  noon  of  1st  December.  Continuing,  it’s  west-northwestward  movement,  it  lay  centered  at  0830  hrs  IST  of  02nd  December,  2017  over  Lakshadweep  area  and  adjoining  southeast  Arabian  Sea.  Moving  north-northeastwards  it  weakened  into  a  Severe  Cyclonic  Storm  (OCKHI)  and  lay  centered  at  1730  hrs  IST  of  04th  December,  2017  over  eastcentral  Arabian  Sea,  weakened  into a cyclonic  storm  in  the  morning  of  5th  December,  weakened  into  a  deep  depression  at  1430  hours  IST,  laid  over  eastcentral  Arabian  Sea,  into  a  depression  at  2030  hours  IST  over  eastcentral  &  adjoining  northeast  Arabian  Sea  and  into  a  well  marked  low  pressure  area  over  east  central  Arabian  Sea  and  adjoining  areas  of  northeast  Arabian  Sea,  north  coastal  Maharashtra  and  south  coastal  Gujarat  at  2330  hours  IST  of  05th  December  2017,  into  a  Low  Pressure  area  over  south  coastal  Gujarat  &  neighbouring areas  at  0830  hours  IST. A very  Severe  Cyclonic  Storm  caused  heavy  to  very  heavy  rainfall  at  many  places  in  Tamil  Nadu,  Kerala  and  Lakshadweep  islands  between    0830  hours  IST  of  29th  November  to  0830  hours  IST  of  03rd  December  and  over  Konkan  &  Goa  and  Gujarat  Region  during  0830  hours  IST  of  05th  December  to  0830  hours  IST  of  6th  December    2017. Fresh Depression over Bay of Bengal Last  week’s  low  pressure  area  over  the Malay  Peninsula  and  adjoining  south  Andaman  Sea  with  associated  upper  air  cyclonic  circulation  extending  up to  5.8  km  above  mean  sea  level  on  30th,  as  a  well  marked  low  pressure  area  over  south  Andaman  Sea  &  adjoining  strait  of  Malacca  on 1st    over  southeast  Bay  of  Bengal  and  adjoining  south  Andaman  Sea  &  equatorial  Indian  ocean  on  the 3rd  &  4th,  over  southeast  Bay  of  Bengal  &  neighbouring areas  on  5th  and  concentrated  into  a  Depression  over  southeast  Bay  of  Bengal  &  neighbouring areas  and  lay  centred  at  0830  hours  IST  of 6th  December,  2017,  about  1160  km  to  the  southeast  of  Machlipatnam  and  1250  km  south-southeast  of  Gopalpur. This  system  caused  heavy  to  very  heavy  rainfall  at  many  places  over  Nicobar  Islands  between  0830  hours  IST  of  01st  December  to  0830  hours  IST  of  04th  December  2017. IMD’s  FORECAST  The system is very likely to move north-northwestwards and reach north Andhra  Pradesh  and  south  Odisha  coasts  by around  9th  December  morning. The  system  is  likely  to  intensify  further  into  a  Deep  Depression  during  next    24  hours.  However,  there  is  a  probability  of  slight  weakening  of  the  system  when  it  reaches  near  north  Andhra  Pradesh  and  south  Odisha  coasts. Dense  fog  was observed  at  isolated  places  over  Punjab,  East  Uttar  Pradesh  and  Tripura  on  one/two  days  of  the  week. The  lowest  minimum  temperature  of  5.0°C  was  recorded  at  Adampur  (Punjab)  in  the  plains  of  the  country  on  2nd  December  2017. INSAT  pictures  of  Intensification  of  the  system INSAT  pictures  of  Weakening  of  the  system During    the    week  Gujarat  State,  Konkan  &  Goa,  Tamil Nadu  &  Puducherry,  Coastal  Karnataka,  South  Interior  Karnataka,  Kerala,  Andaman  &  Nicobar  Islands  &  Lakshadweep  received  excess  rainfall  and  Rayalaseema  received  normal  rainfall,  other  Sub-Divisions  received  large / deficient / no  rainfall.  Northeast  Monsoon  was  vigorous/active  in  Tamilnadu  &  Puducherry  and  Kerala  on  many  days  of  the  week    and  active  over  Lakshadweep  on  few  days  of  the  week  due  to  Very  Severe  Cyclonic  Storm  “OCKHI”.
During    the    week,    rainfall    over    the    country    as    a    whole    was    62 per cent    above    the    long    period    average    (LPA).  The Southern  Peninsula  received  excess  rainfall  and  Central  India  received  normal  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 6.2 3.8 62%
Northwest    India 0.1 1.8 -96%
Central    India 2.4 2.2 8%
South    Peninsula 27.2 11.1 145%
East    &    Northeast    India 0.0 2.3 -99%
Seasonal    All    India    Country    as    a    whole    (1st    October to 06th December 2017): For    the    country    as    a    whole,    cumulative    rainfall    was    (-10%)    of    LPA    as    on    29th    November    2017.  Cumulative rainfall was largely deficient over Northwest India.    Rainfall    was    excess/normal    over    the    most    of    Sub-divisions    of    East &    Northeast    India    and    the South    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 102.0 113.8 -10%
Northwest    India 4.1 43.9 -91%
Central    India 71.2 75.3 -5%
South    Peninsula 239.0 250.7 -5%
East  &  Northeast    India 187.1 159.6 17%
Due to movement of depression towards northwest and western disturbance to the east, some of the Sub-Divisions of East & Northwest India & South Peninsula are likely to get above normal rainfall activity; the other regions are likely to get below normal rainfall activity. Heavy rainfall is likely over Andhra Pradesh, Odisha & West Bengal on one/two days of the week.
Western Himalayan region and some of the Sub-Divisions of Central India & South Peninsula is likely to get above normal rainfall, other regions are likely to get slightly above normal rainfall
Delhi (Safdarjung) Mumbai ( Santacruz) Kolkata Chennai Srinagar Lucknow Guwahati Nagpur Ahmedabad Hyderabad Bengaluru Thiruvananthapuram
  • 30 NOV.  2017:  TAMILNADU & PUDUCHERRY:  VALLAM-7, THUCKALAY-7, PONDICHERRY-7; KERALA: ARYANKAVU-15.
  • 01 DEC.  2017:  TAMILNADU  &  PUDUCHERRY:  PAPANASAM-45, MANIMUTHARU-38, MYLAUDY-19, THENKASI (TIRUNELVELI DIST) 17, THUCKALAY-16, PECHIPARAI-16, GUDALUR-16, BHOOTHAPANDY-16, WATRAP-15, MANIYACHI-14, ERANIEL-14, COLACHEL-14, NAGERCOIL-13, KODAIKANAL-13, COONOOR PTO-13, KUZHITHURAI-12, SRIVILLIPUTHUR-12, SATANKULAM-12, SHENCOTTAH-12, AYIKUDI-12, COONOOR-12, SRIVAIKUNTAM-12, SAMAYAPURAM-12, OTTAPADIRAM-11, TIRUCHENDUR-11, KOVILPATTI AWS-11, TUTICORIN-10, UTTAMAPALAYAM-10, AMBASAMUDRAM-10, KANYAKUMARI-10, RADHAPURAM-9, POLUR-9, KOVILPATTI-9, MADAVARAM AWS-9, SANKARANKOIL-9, SATTUR DAM-9, ARANI-8, SIVAGANGA-8, SIVAGIRI-8, UTHIRAMERUR-8, RAJAPALAYAM-8, ANNA UNIVERSITY-8, UTHAGAMANDALAM-8, GRAND ANAICUT-8, CHEMBARABAKKAM-8, DGP OFFICE CHENNAI-8, MUSIRI-7, VADIPATTI-7, K.PARAMATHI-7, KARUR-7, ANNA UTY ARG-7, VILATHIKULAM-7, LALGUDI-7, AMBUR-7, MAYANUR-7, PANCHAPATTI-7, PADALUR-7, K BRIDGE-7, THAMARAIPAKKAM-7, CHOLAVARAM-7, PERIYAKULAM-7, NANGUNERI-7, KALUGUMALAI-7, CHENNAI(N)-7; KERALA: ARYANKAVU-26, MYLADUMPARA_ AGRI-12, PUNALUR-9.THIRUVANANTHAPURAM AP-8, NEYYATTINKARA-8.; LAKSHADWEEP: MINICOY-19
  • 02 DEC.  2017:  ANDAMAN & NICOBAR ISLANDS:  CARNICOBAR(IAF)­9; TAMILNADU & PONDICHERRY: SATHANUR DAM-23, SIRKALI-19, CHIDAMBARAM-18, ANAIKARANCHATRAM-18, CHIDAMBARAM AWS-17, VIRUDACHALAM-15, CHENGAM-15, GINGEE-14, MYLAM AWS-14, K.M.KOIL-14, TIRUKOILUR-13, VILUPURAM-13, COONOOR PTO-13, KARAIKAL-13, CUDDALORE-12, SETHIATHOPE-12, TIRUVANNAMALAI-12, PONDICHERRY-11, MAYANUR-10, PARAMATHIVELUR-10, POLUR-10, PARANGIPETTAI-9, KALLAKURICHI-9, KODAVASAL-9, NAGAPATTINAM-9, VANUR-9, MAYILADUTHURAI-9, SANKARAPURAM-9, JAYAMKON DAM-9, ERANIEL-9, NEYVELI AWS-9, RAYAKOTTAH-9, KUZHITHURAI-9, ARIYALUR-9, TINDIVANAM-9, SRIMUSHNAM-8, TOZHUDUR-8, TIRUVAIYARU-8, VALANGAIMAN-8, TIRUVARUR-8, PAPANASAM-8, ULUNDURPET-8, KOTHAGIRI-8, HARUR-7, PANRUTI-7, NEEDAMANGALAM-7, THUCKALAY-7, UTHANGARAI-7, NAGERCOIL-7, ARANI-7, ATTUR-7; KERALA: . THIRUVANANTHAPURAM AP-8, ANGADIPPURAM-7, PERINTHALMANNA-7; LAKSHADWEEP: MINICOY-14.
  • 03 DEC. 2017:  ANDAMAN & NICOBAR ISLANDS:  CARNICOBAR­14; CARNICOBAR (IAF)­7; NANCOWRIE­6.; TAMILNADU & PONDICHERRY: TIRUVARUR-14, PANDAVAIYAR HEAD-13, KODAVASAL-13, VALANGAIMAN-12, NANNILAM-12, NAGAPATTINAM-11, NEEDAMANGALAM (TIRUVARUR DIST), KUMBAKONAM-9, KARAIKAL-9, THIRUTHURAIPOONDI-8, ADUTHURAI AWS-8, TIRUVADANAI-8, THIRUVIDAIMARUTHUR-7.
  • 04 DEC. 2017:  NIL
  • 05 DEC.2017: ANDAMAN & NICOBAR ISLANDS:  NANCOWRIE­19, CARNICOBAR,  CARNICOBAR (IAF)­15.
  • 06 DEC.2017: GUJARAT REGION: UMERGAM-9, VAPI-9, WAGHAI-7, PARDI-7, VANSDA-7, GANDEVI-ARG-7; KONKAN & GOA: DAHANU-10, MUMBAI (COLABA )-8, TALASARI-8, PALGHAR-7.
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