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GOVERNMENT OF INDIAMINISTRY OF EARTH SCIENCES

EARTH SYSTEM SCIENCE ORGANIZATIONINDIA METEOROLOGICAL DEPARTMENT

GICO AL LOR DO EE P

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CAL ETC ALIM

NATIONAL CLIMATE CENTRE, PUNE

CLIMATE DIAGNOSTICS BULLETIN OF INDIA

APRIL 2015

NEAR REAL - TIME ANALYSES

APRIL - 2015MAIN FEATURES OF THE MONTH

Below normal maximum temperature/ Heat wave conditions

In general, maximum temperature was below normal over most parts of the country. Thus it was secondsuccessive month of the season which witnessed well below normal temperature throughout the country. It was below

0normal by about 5 to 10 C over some stations of north, northwest, northeast and central India on many occasions during the month. Minimum temperature was also below normal especially over some stations of central India. Thefollowing table gives the list of stations and number of days (frequency) for which the maximum / minimum

0temperature was below normal by more than 5 C (compared to 1971-2000 normal) for six/ five days or more during themonth. Frequencies marked * are the record since 1971.

However, Severe Heat Wave/ Heat wave conditions prevailed at isolated places on some occasions oversome parts of Odisha during the first week, over parts of Saurashtra & Kutch during the second and third week andover parts of Rajasthan during third and fourth week of the month.

Rainfall Features

Rainfall activity over the country as a whole was substantially above normal. Country as a wholereceived more than one and half times of its normal rainfall.Almost entire country received excess rainfall. Somesubdivisions of north, northwest and central India, received more than five times of their respective normal rainfall. Outof 36 meteorological subdivisions, 31 received excess rainfall, 4 received normal rainfall and remaining onesubdivision (Konkan & Goa) received scanty rainfall. (Fig.1). Table 1 shows the subdivision wise rainfall statistics(mm) forApril 2015.

Many stations of the country received record rainfall in 24 Hrs. during the month. A list of such stations whichreceived rather heavy (>=35.6 mm) rainfall or more is given below with the previous record and date.

Fig. 2(a) shows the spatial pattern of rainfall (mm) received during the month. South peninsula,eastern/northeastern and extreme northern parts of the country in general received more than 50 mm of rainfall. Partsof Jammu & Kashmir, Himachal Pradesh, Telangana, Coastal Karnataka, South Interior Karnataka, Kerala, TamilNadu, Gangetic West Bengal, Andaman & Nicobar Islands and extreme northeastern region of the country receivedmore than 100 mm of rainfall. Western parts of Jammu & Kashmir, Some parts of Kerala and most parts of extremenortheastern region received more than 200 mm of rainfall.

Fig. 2(b) shows the spatial pattern of rainfall anomaly (mm) during the month. Except for some parts ofKonkan & Goa and adjoining parts of Madhya Maharashtra and north Karnataka, rainfall anomaly was positive almostthroughout the country. Positive rainfall anomaly over parts of Jammu & Kashmir, north Chattisgarh, Odisha,Telangana, Rayalaseema, Tamil Nadu, Kerala and most parts of extreme northeastern region exceeded 50 mm.

1

STATION FRQCONTAI 7*

PENDRA 6

AHMADNAGAR 7*

BULDANA 5*

NAGPUR 5*

YEOTMAL 6

RENTACHINTALA 7*

MINIMUM TEMP. BELOW NORMAL

STATION FRQ STATION FRQ

PASIGHAT 6 MUKTESWAR 9

BERHAMPUR 7 VARANASI 9

ASANSOL 10 JAMMU 7

SAMBALPUR 7 AMBIKAPUR 8

TITLAGARH 10* JAGDALPUR 8*

GAYA 6 SEONI 7

PURNEA 6 CHANDRAPUR 6

BAHRAICH 7 NAGPUR 6*

BAREILLY 10 PARBHANI 6*

GORAKHPUR 9 YEOTMAL 7

LUCKNOW 10* GULBARGA 6*

MAXIMUM TEMPERATURE BELOW NORMAL

RAINFALL (mm) DATE PREVIOUS

IN 24 Hrs. (NEW REC.) Apr-15 RECORD

1 BAGHDOGRA 85.2 29 82.6 22 1945

2 HISSAR 47.3 3 41.9 15 1983

3 KARNAL 40.0 4 26.4 14 1955

4 CHURU 61.3 3 26.6 18 1971

5 PILANI 38.2 3 25.4 18 1972

6 PARBHANI 50.9 16 39.8 13 1962

7 OSMANABAD 71.5 10 38.8 25 1993

8 HYDERABAD 61.4 13 60.7 20 1937

9 PONDICHERRY 64.4 25 39.2 1 2008

10 THIRUVANTHAPURAM 160.6 22 134 5 2005

STATION DATE YEARS.NO.

Fig. 3(a) shows the area weighted cumulative weekly rainfall percentage departure over the country as awhole for the month. Cumulative rainfall departure was substantially positive during all the weeks of themonth. For April 2015, rainfall for the country as a whole was 174% of its Long Period Average (LPA) value.Fig. 3(b) shows the all India area weighted rainfall series for the month since 1951. Rainfall for the month this year(66.7mm) was the second highest 1901 after the year 1977 (70.0mm).

Fig.4 shows the area weighted rainfall series for the month over the four homogeneous regions since 1951.The rainfall for the month this year was over twice its normal value over Northwest India (201% of its LPA (highestsince 2001, and fifth highest since 1901)), Central India (255% of LPA (highest since 2001, and fifth highestsince 1901)) and the South Peninsular India (227% of LPA (highest since 2001, and third highest since 1901)).Over the Northeast India it was 128% of its LPA.

Table 2 gives the list of stations which received heavy (>= 6.5 cm) or very heavy (>=12.5 cm) rainfall in 24 hours during the month.

Standardized Precipitation Index

The Standardized Precipitation Index (SPI) is an index used for and is based only onprecipitation. This index is negative for drought, and positive for wet conditions. As the dry or wet conditions becomemore severe, the index becomes more negative or positive. Fig 5(a, b, and c) give the SPI values for the month ofApril2015, March-April 2015 (2 months cumulative) and June 2014-April 2015 (11 months cumulative) respectively.

During April, extremely wet/ severely wet conditions were observed over parts of Arunachal Pradesh, Assam& Meghalaya, Gangetic West Bengal, Odisha, Jharkhand, Bihar, Uttar Pradesh, Uttarakhand, Haryana, Chandigarh& Delhi, Punjab, Himachal Pradesh, Jammu & Kashmir, Rajasthan, Madhya Pradesh, Gujarat, Madhya Maharashtra,Marathawada, Vidarbha, Chattisgarh, Andhra Pradesh, Tamil Nadu, North Interior Karnataka, South InteriorKarnataka and Kerala while extremely dry/severely dry conditions were observed over parts of Nagaland, Manipur &Mizoram.

Cumulative SPI values of the past two months indicate, extremely wet/ severely wet conditions wereobserved over parts of Arunachal Pradesh, Jharkhand, Bihar, Uttar Pradesh, Uttarakhand, Haryana, Chandigarh &Delhi, Punjab, Himachal Pradesh, Jammu & Kashmir, Rajasthan, Madhya Pradesh, Gujarat, Maharashtra,Chattisgarh, Telangana, Rayalaseema, Tamil Nadu, Karnataka and Kerala while extremely dry/severely dryconditions were observed over parts of Nagaland and Manipur.

Cumulative past eleven months SPI values indicate, extremely wet/ severely wet conditions were observedover parts Odisha, Bihar, Jammu & Kashmir, West Madhya Pradesh, Tamil Nadu and South Interior Karnataka whileextremely dry/severely dry conditions were observed over parts of Arunachal Pradesh, Assam & Meghalaya,Nagaland, Manipur, Jharkhand, Bihar, Uttar Pradesh state, Haryana, Chandigarh & Delhi, Punjab, Marathawada,Chattisgarh, CoastalAndhra Pradesh and Telangana.

Pressure & Wind

Figs. 6(a) & 6(b) show the mean sea level pressure & its anomalies respectively. The pressure anomaly waspositive over most parts of the country except for some parts of West Rajasthan and adjoining Saurashtra & Kutch.Over western parts of the country it was of the order of 1.0 hPa, while it exceeded 2.0 hPa over northern/northeasternparts of the country.

Figs. 7(a) & 7(b), 8(a) & 8(b) and 9(a) & 9(b) shows the mean circulation patterns and its anomalies at 850,500 & 250 hPa levels respectively.

At 850 hPa level, an anomalous cyclonic circulation was observed over the south Arabian sea andneighbourhood. An anomalous feeble east-west trough was also observed over the north peninsula upto

080 E. At 500 hPa level, an anomalous anticyclonic circulation/ridge was observed over the central and northArabian sea. At 250 hpa level, this anomalous anticyclonic circulation/ridge was more marked and widespread.

Velocity Potential & Stream Function

Figs. 10(a) & 10(b) show the 250 hPa mean Velocity Potential & its anomalies. Similarly, Figs. 11(a) & 11(b)show the mean stream function & its anomalies at 850 hPa level. Negative values are indicated by dashed lines.Anomaly in the velocity potential at 250 hPa level was positive throughout the country, while anomaly in the streamfunction at 850 hPa level was negative throughout the country.

measuring drought

2

Outgoing Longwave Radiation (OLR)

2OLR anomaly (W/m ) over the Indian region and neighbourhood is shown in Fig 12. OLR anomaly was

negative over most parts of the country and adjoining seas. Over extreme south peninsula, eastern/ northeastern2

parts of the country and southAndaman sea, negative OLR anomaly exceeding 10 to 20 W/m was observed.

Temperature

Mean monthly maximum and minimum temperature anomalies are shown in Figs. 13(a) & 13(b) respectively.

Maximum temperature was below normal over most parts of the country except some parts ofGujarat, Rajasthan, west and east coast and the Islands. Over northern, northeastern, central and adjoining north

0peninsular parts of the country, it was in general below normal by more than 1 C. Over some central andnorthern/northeastern parts of the country viz. Chattisgarh, East Madhya Pradesh, Vidarbha, Marathwada,Telangana, Uttarakhand, Uttar Pradesh, Bihar, Jharkhand and Gangetic West Bengal, maximum temperature was

0 0below normal by about 2 to 3 C. Over some parts of Saurashtra & Kutch, it was above normal by about 1 C.

Minimum temperature in general was below normal over central, peninsular andeastern/northeastern parts of the country and above normal over western and northern parts of the country.Over parts of Vidarbha and adjoining Madhya Pradesh and Chattisgarh, Marathwada and Telangana it was below

0normal by about 1 to 2 C. Over most parts of Gujarat and Rajasthan, minimum temperature was above normal by 1 to

02 C.

Percentage of Warm days/Cold nights

Fig 14(a) &14(b) show the percentage of days when maximum (minimum) temperature was more (less) thanth th

90 (10 ) percentile.

thOver some parts of Saurashtra & Kutch and Odisha, maximum temperature was greater than 90 percentile

for more than 30% of the days of the month. Similarly, over some parts of Vidarbha, Chattisgarh, Telangana and Southth

Interior Karnataka, minimum temperature was less than 10 percentile for more than 30% of the days of the month.

Fig.15 shows the mean temperature for the country as a whole forApril since 1971. Five year moving average0

values are also shown. The mean temperature for the month this year (28.86 C) was below normal by about 0.50 0C. It was the second lowest since 2001 after the year 2005 (28.78 C).

Fig.16 (a) & 16(b) show the maximum and minimum temperature series respectively for the country as awhole and the four homogeneous regions during the month since 1971. Maximum temperature was below normalover the country as a whole and also over all the homogeneous regions. The maximum temperature over the

0 0 0country as a whole (35.12 C) was third lowest since 1971 after the years 1997(33.7 C) and 1983(35.1 C). It was

0 0below normal over the Northwest and Northeast India by about 2 C and over Central India by about 1 C. Minimum

0temperature was below/above normal over the Northeast India/ south peninsula by about 0.5 C.

Fig.17 shows the daily maximum temperature recorded over five major stations of the country viz. Kolkata,New Delhi, Nagpur, Chennai and Mumbai during the month.

Low Pressure Systems

No intense low pressure system formed over the Indian seas during the month.

SST anomaly over the Indian & Pacific Ocean

Fig.18 shows the anomaly in sea surface temperature over the tropical Indian and Pacific Ocean. Sea surfacetemperature was near normal over the north Indian Ocean. However, positive anomaly in the sea surface temperature

0(near 1 C) was observed over the north and south Pacific Ocean.

SOI and Pacific SST Index

0SOI (Table 3) was neutral (0.0) during the month. Positive SST anomaly near/exceeding 1 C was observed

over all the NINO regions indicating probability of El-Nino conditions.

Fig.19 shows the CPC/IRI consensus ENSO forecast for the coming seasons. Strengthening of El-Ninocondition (with the highest probability) is expected in the coming seasons.

3

FIG. 1 : SUB-DIVISIONWISE RAINFALL PERCENTAGE DEPARTURES FOR APRIL 2015

4

FIG.2(a) : MONTHLY RAINFALL (mm) FIG.2(b) : MONTHLY RAINFALL ANOMALY (mm)(BASED ON 1951-2000 NORMALS)

FIG. : RAINFALL OVER THE COUNTRY AS A WHOLE

3 (a) ACCUMULATED PERCENTAGE DEPARTURE OF AREA WEIGHTED WEEKLY

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FIG. : WEIGHTED RAINFALL OVER THE FOR APRIL (1951 - 2015)

3 (b) TIME SERIES OF AREA (mm) COUNTRY AS A WHOLE

FIG : AREA WEIGHTED RAINFALL OVER THE FOR APRIL (1951 - 2015)

4 TIME SERIES OF FOUR HOMOGENEOUS REGIONS

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FIG.5 : STANDARDIZED PRECIPITATION INDEX (SPI) FOR (a) ONE MONTH (b) TWO MONTHS (c) ELEVEN MONTHS

(a ) APRIL - 2015

(b) CUMULATIVE MAR - 2015APRIL ( c) CUMULATIVE JUN. 2014 - 2015APRIL

(a) MEAN SEA LEVEL PRESSURE (MSLP)

(b) MSLP ANOMALY

FIG.6 : MONTHLY MEAN SEA LEVEL PRESSURE (hPa)(a) MEAN (b) ANOMALY

(BASED ON 1971-2000 NORMALS)

8

(a) MEAN WIND : 850 hPa

(b) WIND ANOMALY : 850 hPa

FIG. 7 : MONTHLY WIND (m/s) (a) MEAN (b) ANOMALY AT 850 hPa

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(SOURCE : OPERATIONAL NWP ANALYSIS OF IMD GFS T-574)(ANOMALY IS BASED ON 1959-88 CLIMATOLOGY)



FIG. 8 : MONTHLY WIND (m/s) (a) MEAN (b) ANOMALY AT 500 hPa

10




FIG. 9 : MONTHLY WIND (m/s) (a) MEAN (b) ANOMALY AT 250 hPa(SOURCE : OPERATIONAL NWP ANALYSIS OF IMD GFS T-574)

(ANOMALY IS BASED ON 1959-88 CLIMATOLOGY)

11

(a) VELOCITY POTENTIAL :250 hPa

(b) VELOCITY POTENTIAL ANOMALY : 250 hPa

6 2FIG.10 : VELOCITY POTENTIAL (10 m /s) (a) MEAN (b) ANOMALY AT 250 hPa

12


(a) STREAM FUNCTION : 850 hPa

(b) STREAM FUNCTION ANOMALY : 850 hPa

6 2FIG. 11 : STREAM FUNCTION (10 m /s) (a) MEAN (b) ANOMALY AT 850 hPa

13


(a) MAXIMUM TEMPERATURE ANOMALY (b) MINIMUM TEMPERATURE ANOMALY

FIG. 13 : MEAN MONTHLY TEMPERATURE ANOMALIES (°C)(a) MAXIMUM (b) MINIMUM

(BASED ON 1971-2000 NORMALS)

2FIG. 12 : OLR ANOMALY (W/m ) FOR APRIL 2015

(SOURCE : CDC / NOAA, USA)(BASED ON 1981 - 2010 CLIMATOLOGY)

14

(a) WARM DAYS (b) COLD NIGHTS

FIG:14 (a) PERCENTAGE OF DAYS WHEN MAXIMUM TEMPERATURE > 90TH PERCENTILE

(b) PERCENTAGE OF DAYS WHEN MINIMUM TEMPERATURE < 10TH PERCENTILE

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FIG. 15 : TIME SERIES OF MEAN TEMPERATURE AVERAGED OVER INDIA (VERTICAL BARS)AND FIVE YEAR RUNNING MEAN (CONTINUOUS LINE) FOR APRIL (1971 - 2015)

FIG. 16 : TIME SERIES OF TEMPERATURE FOR THE COUNTRY AS A WHOLE AND THE FOUR HOMOGENEOUS REGIONS FOR APRIL (1971 - 2015) (a) MAXIMUM (b) MINIMUM

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FIG. 17 : DAILY MAXIMUM TEMPERATURE FOR FIVE STATIONS OF INDIA

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NORMAL MEAN:36.0(0C)

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18

(Source : http://portal.iri.columbia.edu)

FIG. : CPC / IRI CONSENSUS ENSO FORECASTVERTICAL BARS SHOW PROBABILISTIC ENSO FORECAST

LINES SHOW CLIMATOLOGICAL PROBABILITY

19

FIG. 18: SEA SURFACE TEMPERATURE ANOMALY (°C)(SOURCE OF MEAN DATA: INCOIS-GODAS analysis-www.incois.gov.in)

(SOURCE OF CLIMATOLOGY DATA: 1981-2010 OISST data-www.esrl.noaa.gov)

0%

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MJJ 2015 JJA 2015 JAS 2015 ASO 2015 SON 2015 OND 2015 NDJ 2015 DJF 2015 JFM 2016

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ty

Time Period

ENSO state based on NINO 3.4 SST AnomalyNeutral ENSO: -0.50C to 0.50C

La Niña Neutral El Niño

TABLE 1

METEOROLOGICAL SUBDIVISIONWISE RAINFALL STATISTICS

FOR THE MONTH OF APRIL 2015 BASED ON OPERATIONAL DATA

19

ACTUAL NORMAL %

(mm) (mm) DEP

1 A & N ISLANDS 138.2 81.5 70

2 ARUNACHAL PRADESH 291.2 278.8 4

3 ASSAM &MEGHALAYA 243.3 181.2 34

4 NAG.,MANI.,MIZO.,TRIP 174.7 149.4 17

5 S.H.W.B.&SIKKIM 149.0 123.7 20

6 GANGATIC W.B. 88.4 42.1 110

7 ORISSA 67.6 37.5 80

8 JHARKHAND 49.2 18.4 168

9 BIHAR 36.9 16.3 127

10 EAST U.P. 23.2 5.6 314

11 WEST U.P. 21.4 4.6 365

12 UTTARANCHAL 57.6 33.3 73

13 HAR., CHANDI., DELHI 35.0 7.5 367

14 PUNJAB 29.8 12.5 139

15 HIMACHAL PRADESH 70.1 65.4 7

16 JAMMU & KASHMIR 173.2 97.5 78

17 WEST RAJASTHAN 25.2 4.2 501

18 EAST RAJASTHAN 15.9 2.9 449

19 WEST M.P. 13.3 2.0 566

20 EAST M.P. 25.8 5.5 369

21 GUJARAT REGION 5.9 0.3 1879

22 SAURASHTRA & KUTCH 2.4 0.2 1078

23 KONKAN & GOA 0.9 2.7 -65

24 MADHYA M'RASHTRA 9.4 8.9 6

25 MARATHAWADA 39.6 6.5 509

26 VIDARBHA 28.0 7.7 264

27 CHATTISGARH 36.7 13.8 166

28 COASTAL A.P. 34.0 21.8 56

29 TELANGANA 56.4 16.5 242

30 RAYALASEEMA 70.2 19.9 253

31 TAMIL NADU 108.8 42.3 157

32 COASTAL KARNATAKA 51.1 28.1 82

33 N.I.KARNATAKA 51.3 25.6 100

34 S.I.KARNATAKA 81.4 43.8 86

35 KERALA 214.4 109.5 96

36 LAKSHADWEEP 105.4 48.9 115

MET. SUBDIVISION

ODISHA

& PUDUCHERRY

TABLE 2

STATIONS WHICH RECEIVED HEAVY(= 12.5 cm) RAINFALL IN 24 HOURS DURING APRIL 2015

HEAVY(= 6.5 cm) OR VERY

20

RAINFALL

(cm)

COONOOR TAMIL NADU & PUDUCHHERY 13

GHARMURA ASSAM & MEGHALAYA 11

TUTING ARUNACHAL PRADESH 7

SULYA COASTAL KARNATAKA 7

BEKI MATHUNGARI ASSAM & MEGHALAYA 10

ITANAGAR ARUNACHAL PRADESH 9

TISSA HIMACHAL PRADESH 7

BANIHAL JAMMU & KASHMIR 7

KALANAUR HARYANA, CHND. & DELHI 16

SABROOM NAGA, MIZO, MANI & TRIPURA 8

SILCHAR ASSAM & MEGHALAYA 7

MATIJURI ASSAM & MEGHALAYA 9

ARKI HIMACHAL PRADESH 7

MALSISAR EAST RAJASTHAN 7

MATIJURI ASSAM & MEGHALAYA 10


UDHAMPUR IAF JAMMU & KASHMIR 7

AGARTALA AP NAGA, MIZO, MANI & TRIPURA 10


JALESWAR ODISHA 7

MAHUA TEA ESTATE ARG SUB-HIMALAYAN W.B. & SIKKIM 8

NAYAGARH ODISHA 7

PATTI PUNJAB 13

UDAIPUR NAGA, MIZO, MANI & TRIPURA 8

MATHABHANGA SUB-HIMALAYAN W.B. & SIKKIM 7

KARIMNAGAR TELANGANA 7

9 MUNIGUDA ARG ODISHA 17


LAKHIPUR ASSAM & MEGHALAYA 7

OSMANABAD MARATHWADA 7

VALPARAI TAMIL NADU & PUDUCHHERY 7

LOKAPUR NORTH INTERIOR KARNATAKA 7

MEHGAWAN JHARKHAND 17

KONNI KERALA 8

PISAGAN EAST RAJASTHAN 7

ACHAMPETA TELANGANA 7

GANAGAPURA ARG NORTH INTERIOR KARNATAKA 7

KHAGADIA BIHAR 12

SANKARAPURAM TAMIL NADU & PUDUCHHERY 11

SAMBEPALLE RAYALASEEMA 10

HATTA EAST MADHYA PRADESH 9

HOLENARASIPURA SOUTH INTERIOR KARNATAKA 8

VISAKHAPATNAM AP COASTAL ANDHRA PRADESH 7

VICARABAD TELANGANA 7

ALAMATTI HMS NORTH INTERIOR KARNATAKA 7

KUNNAMKULAM KERALA 7

SATYAVEDU RAYALASEEMA 14

KAMAREDDY TELANGANA 11

R.K.PET TAMIL NADU & PUDUCHHERY 11

NALWAR NORTH INTERIOR KARNATAKA 10

SIRONCHA VIDARBHA 8

NANCOWRY ANDAMAN & NICOBAR ISLANDS 7

AGATHI LAKSHADWEEP 7

TADA COASTAL ANDHRA PRADESH 7

DATE STATION NAME NAME OF SUBDIVISION

1

2

3

4

5

6

7

8

10

11

12

13

14

RAINFALL

(cm)

CHINNAMANDEM RAYALASEEMA 12

CHINTAMANI PTO SOUTH INTERIOR KARNATAKA 12

RAPUR COASTAL ANDHRA PRADESH 11

DHARAPURAM TAMIL NADU & PUDUCHHERY 9

HANDIA EAST UTTAR PRADESH 7

PEERMADE TO KERALA 7

PERIYAKULAM TAMIL NADU & PUDUCHHERY 15

GIRIDIH JHARKHAND 7

HOSUR TAMIL NADU & PUDUCHHERY 12

PERINTHALAMANNA KERALA 7


TIRUPUVANAM TAMIL NADU & PUDUCHHERY 10

CHAMPASSARI SUB-HIMALAYAN W.B. & SIKKIM 8

KARIMGANJ ASSAM & MEGHALAYA 7

GALGALIA BIHAR 12

GHARMURA ASSAM & MEGHALAYA 9

KAILASHAHAR NAGA, MIZO, MANI & TRIPURA 8

GULMARG JAMMU & KASHMIR 8

KANJIRAPPALLY KERALA 7

21 NANGUNERI TAMIL NADU & PUDUCHHERY 18

THIRUVANTHAPURAM KERALA 16

THUCKALAY TAMIL NADU & PUDUCHHERY 15

GOLAGHAT CWC ASSAM & MEGHALAYA 12

LENGPUI NAGA, MIZO, MANI & TRIPURA 9

AVATHI ARG SOUTH INTERIOR KARNATAKA 9

TELIAMURA NAGA, MIZO, MANI & TRIPURA 8

HAFLONG ASSAM & MEGHALAYA 7

ANANDPUR ODISHA 7

TAVARAGERA NORTH INTERIOR KARNATAKA 10

CHANDANPUR ODISHA 9

MADAKASIRA RAYALASEEMA 8

CHOTTABEKRA NAGA, MIZO, MANI & TRIPURA 7

GANGTOK SUB-HIMALAYAN W.B. & SIKKIM 7

ETURNAGARAM TELANGANA 7

PALANI TAMIL NADU & PUDUCHHERY 7

NARSIPATNAM COASTAL ANDHRA PRADESH 11

MAHABALIPURAM TAMIL NADU & PUDUCHHERY 10

RAIRANGPUR ODISHA 8

BAHADURGANJ BIHAR 7

ROING ARUNACHAL PRADESH 11

NIMPARA ODISHA 9

CONTAI GANGETIC WEST BENGAL 7

VENKATAGIRI KOTA RAYALASEEMA 7

KURUDAMANNIL KERALA 9

BODINAICKANUR TAMIL NADU & PUDUCHHERY 7

KURUDAMANNIL KERALA 9

DHAMNAGAR ARG ODISHA 7

SEVOKE SUB-HIMALAYAN W.B. & SIKKIM 7

WILLIAMNAGAR ASSAM & MEGHALAYA 10

BAGHDOGRA AP SUB-HIMALAYAN W.B. & SIKKIM 9

CHHATRAPUR ODISHA 7

GALGALIA BIHAR 7

SUBRAMANYA COASTAL KARNATAKA 7

JIA BHARALI N T XING ASSAM & MEGHALAYA 9

THALI TAMIL NADU & PUDUCHHERY 8

DATE STATION NAME NAME OF SUBDIVISION

15

16

17

18

19

20

22

23

30

28

29

24

25

26

27

ATMOSPHERIC AND SST INDEX VALUES FOR THE RECENT 12 MONTHS.

ATMOSPHERIC INDICES ARE STANDARDIZED BY MEAN ANNUAL STANDARD

DEVIATION EXCEPT FOR THE TAHITI AND DARWIN SLP ANOMALIES WHICH ARE

IN hPa.SST INDICES(ANOMALIES AND MEAN)ARE IN DEGREE CELCIUS

TABLE 3

(Source : CPC/NCEP, USA)

Tahiti SLP

minus

Darwin SLP

Month Tahiti Darwin SOI Anomaly Mean Anomaly Mean Anomaly Mean Anomaly Mean

APR15 0.6 0.6 0.0 1.4 27.0 0.7 28.2 0.8 28.6 1.2 29.7

MAR 15 -0.8 0.6 -0.7 0.1 26.7 0.2 27.3 0.6 27.8 1.1 29.3

FEB 15 1.4 1.0 0.2 -0.6 25.6 0.2 26.6 0.6 27.3 1.0 29.1

JAN 15 -1.7 -0.2 -0.8 -0.4 24.1 0.4 26.0 0.5 27.1 0.9 29.2

DEC 14 -0.9 0.1 -0.6 0.1 22.9 0.8 25.9 0.8 27.4 0.9 29.4

NOV 14 -0.6 1.0 -0.9 0.7 22.3 0.9 25.9 0.9 27.5 0.9 29.5

OCT 14 -0.3 0.8 -0.6 0.8 21.5 0.7 25.6 0.5 27.2 0.6 29.3

SEP 14 -0.2 1.1 -0.7 1.3 21.9 0.5 25.5 0.2 27.0 0.5 29.1

AUG14 -0.2 1.1 -0.7 1.3 21.9 0.5 25.5 0.2 27.0 0.5 29.1

JUL14 0.2 0.5 -0.2 1.4 23.0 0.7 26.3 0.2 27.4 0.3 29.1

JUN14 -0.2 -0.4 0.2 1.8 24.6 0.9 27.4 0.5 28.1 0.6 29.5

MAY14 1.2 0.2 0.5 1.3 25.6 0.6 27.7 0.5 28.3 0.8 29.6

900W - 80

0W 150

0W - 90

0W 170

0W - 120

0W 160

0E - 150

0W

SLP ANOMALIES

PACIFIC SST

NINO 1+2 NINO 3 NINO 3.4 NINO 4

00

- 100S 5

0N - 5

0S 5

0N - 5

0S 5

0N - 5

0S

CLIMATE DIAGNOSTICSBULLETIN OF INDIA

ISSUE No. 230

DESIGNED & PRINTED ATCENTRAL PRINTING UNIT,

OFFICE OF THE ADDITIONAL DIRECTOR GENERALOF METEOROLOGY (RESEARCH),PUNE

ISSUED BYNATIONAL CLIMATE CENTRE

OFFICE OF THE ADDITIONAL DIRECTOR GENERALOF METEOROLOGY (RESEARCH)

INDIA METEOROLOGICAL DEPARTMENTPUNE - 411 005

Compiled & prepared under the supervision of

Dr. A.K. SrivastavaDr. P. Guhathakurta

(Website : http://www.imdpune.gov.in)

climate diagnostics bulletin of...

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