ncmrwf weekly data monitoring report 26/11/2007 to 02/12… · ncmrwf weekly data monitoring report...

NCMRWF Weekly Data Monitoring Report

26/11/2007 to 02/12/2007

Data Processing and Monitoring Group

Permission to quote from this report Should be obtained from Head, NCMRWF

NATIONAL CENTRE FOR MEDIUM RANGE WEATHER FORECASTING

(MINISTRY OF EARTH SCIENCES) A-50, Institutional Area,

Phase-II, Sector-62, NOIDA (U.P.) – 201307 INDIA

2

CONTENTS Page

1. Introduction . . . . . . . . . . . . . 3 2. NCMRWF Monitoring Statistics . . . . . . . . . 4 3. Table-1: Results of Complex Quality Control of Radiosonde . . 5 4. Table-2: Total Upper Air Data Reports . . . . . . . 6-7 5. Table-3a: 100 hPa Geo-potential Height Increments (00z) . . . 8 6. Table-3b: 100 hPa Geo-potential Height Increments (12z) . . . 9 7. Table-4a: 500 hPa Geo-potential Height Increments (00z) . . . 10 8. Table-4b: 500 hPa Geo-potential Height Increments (12z) . . . 11 9. Table-5a: 100 hPa Dry Temperature Increments (00z) . . . . 12 10. Table-5b: 100 hPa Dry Temperature Increments (12z) . . . . 13 11. Table-6a: 500 hPa Dry Temperature Increments (00z) . . . . 14 12. Table-6b: 500 hPa Dry Temperature Increments (12z) . . . . 15 13. Table-7a: 100 hPa Zonal Wind Increments (00z) . . . . . 16 14. Table-7b: 100 hPa Zonal Wind Increments (12z) . . . . . 17 15. Table-8a: 500 hPa Zonal Wind Increments (00z) . . . . . 18 16. Table-8b: 500 hPa Zonal Wind Increments (12z) . . . . . 19 17. Table-9a: 100 hPa Meridional Wind Increments (00z) . . . . .20 18. Table-9b: 100 hPa Meridional Wind Increments (12z) . . . . .21 19. Table-10a: 500 hPa Meridional Wind Increments (00z) . . . .22 20. Table-10b: 500 hPa Meridional Wind Increments (12z) . . . .23 21. Explanatory note on tables and figures . . . . . . . 24-25 22. Global Charts for Five Types of Observations . . . . . . Fig. 1.1 – 1.7 23. Histograms for all Seven Types of Observations . . . . . Fig. 2.1 – 2.7

3

1. INTRODUCTION

As a weekly publication, the NCMRWF Data Monitoring Report presents a general view of the data availability for the whole month as well as its quality. Data produced by the Global Observing System, transmitted by the Global Telecommunication System and received by the India meteorological Department at New Delhi is relayed to the NCMRWF data processing system. This report consists of the results of quantity monitoring of all the data received at the NCMRWF including delayed data upto a period of three days. It may however be mentioned that data which goes into the analysis-forecast system is likely to be less because of the cut-off time. Besides quantity monitoring, the report also presents results of quality monitoring for the Indian subcontinent (blocks 42 and 43) data only. For quality monitoring only those data, which are received at the NCMRWF within the cut-off time are used.

The zone of responsibility of the RTH New Delhi as far as the collection

(through the main telecommunication network) and processing of observational data is concerned includes India, Pakistan, Bangladesh, Nepal, Bhutan, Sri Lanka, Maldives, Burma and adjoining sea and ocean areas. Objective monitoring of the quality of the data ( for block 42 and 43 only) is undertaken by the NCMRWF as a weekly activity. Tables are prepared following the Commission for Basic System (CBS) recommended format so that the monitoring results can be immediately compared with those from other meteorological centers. This is an important task, because frequent comparisons of this kind are absolutely necessary for improvement of the quality of tropical data.

Following the establishment procedure at other major weather forecasting

centers the model first guess has been used in determining data quality. This approach assumes a very accurate first guess, which is not necessarily valid in data sparse regions like the tropics and also due to model systematic errors. As a result the quality monitoring of tropical data is a difficult task, and any judgment has to be arrived at carefully.

This report is an outcome of the combined effort of the Data Processing

and Monitoring Group of the NCMRWF. Cooperation of the other groups at the NCMRWF as well as that of the Computer Maintenance Corporation is acknowledged. Comments and suggestions are welcome and should be sent to :

Head, NCMRWF Attn: Data Processing and Monitoring Group NCMRWF, A-50, Institutional Area, Phase-II, Sector-62 NOIDA (U.P.) – 201307 INDIA

4

2. NCMRWF MONITORING STATISTICS

Availability (global) and data quality (for WMO blocks 42 and 43 only) are presented in figures and tables of which only very brief descriptions are given below. Complete explanations are given at the end of this report.

Data Availability (Global observations, weekly average)

Figs. 1.1 – 1.7 are global charts for all seven types of observations, received at the NCMRWF. Each number is the average for 24 hours, over all observations of the particular type received in a 5-degree box. Fig Observation Type Parameter Level/Layer 1.1 SYNOP / SHIP MSL Pressure Surface 1.2 TEMP Geo-potential 500 hPa 1.3 TEMP / PILOT Wind 300 hPa 1.4 AIREP Wind 300 – 150 hPa 1.6 (a) SATOB Wind 400 – 150 hPa 1.6 (b) SATOB Wind 1000 – 700 hPa 1.7 BUOY MSL Pressure Surface

Data Availability (Number of daily reports)

Figs. 2.1 – 2.7 are histograms for all seven types of reports received at the NCMRWF. Each figure represents number of reports of the particular type for each day of the month.

Fig Observation Type Parameter 2.1 SYNOP / SHIP MSL Pressure 2.2 TEMP Geo-potential / Wind 2.3 PILOT Wind 2.4 AIREP Wind 2.6 SATOB Wind 2.7 BUOY MSL Pressure

5

TABLE 1 RESULTS OF COMPLEX QUALITY CONTROL OF RADIOSONDE

MANDATORY LEVEL HEIGHTS AND TEMPERATURES FOR 26 11 2007 TO 2 12 2007

Total Number of Reports for Land Stations by WMO Block (00Z and 12Z) 0 1 2 3 4 5 6 7 8 9 0 0 84 70 72 78 0 45 82 103 0 10 153 62 62 11 15 28 128 90 0 0 20 32 24 93 111 138 70 65 125 71 126 30 126 133 65 46 97 43 14 33 12 0 40 101 55 187 162 21 14 0 357 114 0 50 56 98 126 98 140 28 140 182 180 111 60 81 83 49 23 23 30 0 0 117 0 70 192 398 866 0 61 0 39 0 100 0 80 15 14 92 186 4 37 0 12 14 113 90 0 205 0 50 283 12 138 62 10 0 Error Counts by WMO Block (all hydrostatic error types) 0 1 2 3 4 5 6 7 8 9 0 0 2 1 1 3 0 0 1 5 0 10 12 6 24 0 3 0 28 4 0 0 20 13 21 67 3 2 1 0 1 19 24 30 3 2 4 1 9 0 0 0 0 0 40 7 18 51 23 0 0 0 69 28 0 50 0 4 25 1 1 0 5 25 4 52 60 19 24 4 2 16 18 0 0 19 0 70 7 47 110 0 3 0 2 0 40 0 80 2 0 12 34 1 3 0 1 0 6 90 0 59 0 18 54 1 87 21 9 0 Percent of Confident Corrections by WMO Block 0 1 2 3 4 5 6 7 8 9 0 0 0 0 100 0 0 0 0 25 0 10 100 33 0 0 0 0 0 25 0 0 20 14 0 0 0 50 100 0 0 0 0 30 66 100 50 0 100 0 0 0 0 0 40 33 33 63 19 0 0 0 50 50 0 50 0 0 0 100 100 0 39 0 100 0 60 0 100 0 0 79 19 0 0 0 0 70 100 33 60 0 0 0 0 0 69 0 80 0 0 50 39 100 0 0 0 0 50 90 0 50 0 0 25 0 84 44 100 0

6

TABLE 2: TOTAL UPPER AIR REPORTS RECEIVED 26 11 2007 TO 2 12 2007 FOR WMO BLOCK 42 AND 43 STATIONS ONLY

WMO STATION AT 00Z AT 06Z AT 12Z AT 18Z IDENT NAME T P T P T P T P 42027 SRINAGAR 5 4 0 1 4 3 0 0 42033 SASOUMA 0 0 0 0 0 0 0 0 42055 JAMMU 0 0 0 0 0 0 0 0 42057 PATHANKOT 0 0 0 0 0 0 0 0 42065 MANALI 6 5 0 0 0 0 0 0 42071 AMRITSAR 0 4 0 0 0 7 0 0 42073 ADAMPUR 0 0 0 0 0 0 0 0 42098 HALWARA 0 0 0 0 0 0 0 0 42101 PATIALA 5 6 0 1 6 5 0 0 42103 AMBALA 0 0 0 0 0 0 0 0 42105 CHANDIGARH 0 0 0 0 0 0 0 0 42111 DEHRA DUN 0 0 0 0 0 0 0 0 42123 GANGANAGAR 0 0 0 0 0 0 0 0 42165 BIKANER 0 0 0 0 0 0 0 0 42170 CHURU 0 0 0 0 0 0 0 0 42182 NEW DELHI/SAF 7 7 0 7 7 7 0 6 42189 BAREILLY 0 0 0 0 0 0 0 0 42260 AGRA 0 0 0 0 0 4 0 0 42273 BAHRAICH 0 0 0 0 0 0 0 0 42299 GANGTOK 0 2 0 0 0 2 0 0 42314 DIBRUGR/MOHAN 7 7 0 4 0 5 0 6 42328 JAISALMER 0 0 0 0 0 0 0 0 42339 JODHPUR 5 5 0 0 7 6 0 0 42348 JAIPUR/SNGNER 5 6 0 0 0 0 0 0 42361 GWALIOR 6 6 0 0 0 0 0 0 42369 LUCKNOW/AMAUS 7 7 0 0 7 4 0 0 42379 GORAKHPUR 6 6 0 0 0 0 0 0 42397 SILIGURI 7 0 0 0 0 0 0 0 42398 BAGDOGRA 0 0 0 0 0 0 0 0 42410 GAUHATI 7 7 0 2 6 6 0 0 42416 TEZPUR/BINDUK 0 0 0 0 0 0 0 0 42423 JORHAT 0 0 0 0 0 0 0 0 42435 BARMER 0 0 0 0 0 0 0 0 42452 KOTA AERODROM 0 7 0 0 0 4 0 0 42475 ALLAHABAD/BAM 0 0 0 0 0 0 0 0 42492 PATNA 7 7 0 0 6 7 0 0 42498 BHAGALPUR 0 5 0 0 0 6 0 0 42539 DEESA 0 0 0 0 0 0 0 0 42542 UDAIPUR DABOK 0 0 0 0 0 0 0 0 42591 GAYA 0 0 0 0 0 0 0 0 42623 IMPHAL TULIHL 0 0 0 0 0 0 0 0 42634 BHUJ-RUDRAMTA 0 0 0 0 0 0 0 0 42647 AHMADABAD 6 5 0 0 0 0 0 0 42667 BHOPAL/BAIRGR 7 7 0 0 7 7 0 0 42675 JABALPUR 0 0 0 0 0 0 0 0 42701 RANCHI 7 7 0 0 0 0 0 0 42706 BANKURA 0 0 0 0 0 0 0 0 42724 AGARTALA 7 7 0 1 7 7 0 0

Continued…

7

Continued from pre page… WMO STATION AT 00Z AT 06Z AT 12Z AT 18Z IDENT NAME T P T P T P T P 42734 JAMNAGAR 0 0 0 0 0 0 0 0 42798 JAMSHEDPUR 0 0 0 0 0 0 0 0 42802 KALAIKUNDA 0 0 0 0 0 0 0 0 42809 CALCUTTA/DMDM 0 0 0 0 0 0 0 0 42867 NAGPUR SONEGN 7 7 0 1 0 0 0 0 42874 RAIPUR 7 7 0 0 0 0 0 0 42886 JHARSUGUDA 0 0 0 0 0 0 0 0 42895 BALASORE 0 2 0 0 0 3 0 0 42909 VERAVAL 0 0 0 0 0 0 0 0 42971 BHUBANESWAR 6 6 0 0 2 2 0 0 43003 BOMBAY/SANTCR 7 6 0 0 7 7 0 0 43014 AURNGABAD/AER 6 6 0 0 0 0 0 0 43041 JAGDALPUR 7 6 0 0 0 0 0 0 43049 GOPALPUR 0 0 0 0 0 0 0 0 43063 POONA 0 0 0 0 0 0 0 0 43110 RATNAGIRI 0 5 0 0 0 5 0 4 43128 HYDERABAD AER 7 7 0 0 6 6 0 0 43150 VISHAKHAPATNM 7 7 0 2 7 6 0 0 43185 MACHILIPATNAM 6 7 0 0 6 7 0 0 43192 GOA/PANJIM 6 6 0 0 0 0 0 0 43194 GOA/DABOLIM 0 0 0 0 0 0 0 0 43201 GADAG 0 0 0 0 0 0 0 0 43237 ANANTAPUR 0 0 0 0 0 0 0 0 43279 MADRAS/MINAMB 7 7 0 0 7 7 0 0 43284 MANG/BAJPE 0 0 0 7 0 0 0 7 43285 MANG/PANAMBUR 3 3 0 0 3 3 0 0 43295 BANGALORE 7 5 0 5 7 7 0 7 43311 AMINI DIVI 0 6 0 3 0 6 0 5 43333 PORT BLAIR 7 7 0 6 0 6 0 3 43344 TIRUCHIRAPLLI 0 0 0 0 0 0 0 0 43346 KARAIKAL 7 6 0 0 0 0 0 0 43353 COCHIN/WILING 7 7 0 0 7 5 0 0 43368 CAR NICOBAR 0 0 0 0 0 0 0 0 43369 MINICOY 7 7 0 0 7 7 0 0 43371 TRIVANDRUM 6 7 0 0 6 7 0 0 43373 TRIVANDRUM/TH 0 0 0 0 0 0 0 0

8

TABLE 3a: NCMRWF RADIOSONDE MONITORING STATISTICS FOR WMO BLOCK 42 AND 43 STATIONS ONLY

100 HPA GEOPOTENTIAL HEIGHT INCREMENTS - 26 11 2007 TO 2 12 2007(00Z)

UNIT IS GEOPOTENTIAL METERS

WMO OBS % SD BIAS RMS IDENT RECD REJ 42101 1 0 0.0 -25.8 25.8 42182 7 14 50.4 -11.8 51.8 42314 5 20 174.1 -45.5 179.9 42339 4 0 13.0 -51.3 52.9 42369 6 0 48.0 -95.3 106.7 42379 1 0 0.0 -15.1 15.1 42397 1 0 0.0 862.0 862.0 42410 4 0 59.0 24.0 63.7 42492 5 20 149.0 11.8 149.5 42701 4 0 50.2 111.2 122.0 42867 7 0 58.8 20.7 62.3 42971 3 0 60.6 118.2 132.8 43003 5 0 34.2 -213.7 216.4 43128 4 50 215.6 32.5 218.0 43150 6 0 159.5 32.1 162.7 43185 6 17 81.8 63.6 103.6 43279 4 0 93.8 6.4 94.0 43295 4 25 259.0 -87.7 273.4 43333 4 0 77.1 67.7 102.6 43346 4 25 85.1 43.5 95.6 43353 3 33 524.2 -405.5 662.7 43369 4 50 409.3 -596.0 723.0 43371 3 33 3518.7 -2983.5 4613.3

9

TABLE 3b: NCMRWF RADIOSONDE MONITORING STATISTICS FOR WMO BLOCK 42 AND 43 STATIONS ONLY



WMO OBS % SD BIAS RMS IDENT RECD REJ 42101 4 0 106.7 37.1 112.9 42182 7 0 118.4 65.4 135.2 42339 4 25 116.3 104.5 156.3 42369 5 40 82.9 -140.5 163.1 42410 1 0 0.0 -190.0 190.0 42492 4 0 37.7 -210.3 213.6 43003 4 0 86.1 -14.2 87.3 43128 6 0 77.2 122.4 144.7 43150 4 25 142.7 -53.5 152.4 43185 4 0 92.0 97.9 134.3 43279 1 0 0.0 42.0 42.0 43285 1 0 0.0 210.6 210.6 43295 3 0 22.6 120.7 122.8 43353 4 0 211.9 39.8 215.6 43369 3 67 128.0 96.2 160.1 43371 3 0 106.7 41.6 114.5

10




WMO OBS % SD BIAS RMS IDENT RECD REJ 42027 4 0 82.8 -17.5 84.6 42065 4 50 23.9 -81.2 84.6 42101 5 0 22.5 -18.2 28.9 42182 7 71 23.1 33.7 40.8 42314 7 14 40.6 -27.0 48.7 42339 7 14 83.2 18.5 85.2 42348 5 0 48.0 77.0 90.8 42361 3 0 52.5 17.9 55.5 42369 7 43 29.9 -12.1 32.2 42379 4 0 15.9 3.3 16.2 42397 7 14 16.0 -139.6 140.5 42410 7 43 202.5 -195.4 281.4 42492 7 14 42.2 3.2 42.3 42647 5 60 51.8 -15.4 54.0 42667 6 17 35.6 29.6 46.3 42701 7 0 42.5 27.5 50.6 42724 7 14 16.9 23.7 29.1 42867 8 0 19.0 22.4 29.4 42874 6 83 40.7 -21.7 46.1 42971 5 20 15.4 13.7 20.6 43003 6 17 43.6 -22.6 49.1 43014 6 0 36.8 15.0 39.8 43041 6 0 26.5 0.7 26.5 43128 7 29 40.5 21.2 45.7 43150 8 75 41.9 4.3 42.1 43185 6 17 22.1 65.1 68.7 43192 6 17 19.0 5.4 19.8 43279 7 29 32.7 21.5 39.2 43285 3 33 23.4 50.4 55.6 43295 7 0 12.7 31.7 34.2 43333 6 17 30.8 66.5 73.3 43346 7 57 12.9 24.5 27.7 43353 8 75 33.2 41.4 53.1 43369 7 29 18.4 39.7 43.8 43371 6 67 18.9 21.6 28.7

11




WMO OBS % SD BIAS RMS IDENT RECD REJ 42027 2 0 14.4 84.4 85.7 42101 6 0 32.6 21.7 39.2 42182 7 71 30.3 30.5 43.0 42339 6 50 16.6 23.0 28.3 42369 6 50 49.5 -25.6 55.7 42410 5 80 81.4 -15.5 82.9 42492 6 67 37.0 -9.6 38.2 42667 7 29 34.0 35.5 49.1 42724 7 43 24.2 -0.4 24.2 42971 2 50 31.4 6.4 32.1 43003 5 0 10.9 2.5 11.2 43128 6 33 21.4 46.8 51.4 43150 7 86 27.8 -2.2 27.9 43185 6 0 28.9 32.2 43.3 43279 5 80 30.5 40.7 50.9 43285 3 33 17.6 89.5 91.2 43295 7 29 17.7 41.1 44.7 43353 7 43 44.7 6.4 45.2 43369 7 43 40.2 31.7 51.2 43371 6 83 17.2 5.4 18.0

12


100 HPA DRY TEMPERATURE INCREMENTS - 26 11 2007 TO 2 12 2007(00Z)

UNIT IS DEGREES KELVIN

WMO OBS % SD BIAS RMS IDENT RECD REJ 42101 1 0 0.0 0.5 0.5 42182 7 14 2.4 -0.2 2.4 42314 5 0 2.5 9.7 10.1 42339 4 0 2.2 -2.2 3.1 42369 6 0 2.0 -2.7 3.4 42379 1 0 0.0 0.5 0.5 42397 1 0 0.0 26.9 26.9 42410 4 25 2.9 0.9 3.0 42492 5 0 2.8 3.0 4.1 42701 4 25 0.6 -4.1 4.1 42867 7 0 4.0 -4.0 5.7 42971 3 0 3.6 -3.0 4.7 43003 5 20 5.2 -3.6 6.3 43128 4 0 6.1 -0.6 6.1 43150 6 0 1.7 -6.0 6.3 43185 6 0 5.8 0.9 5.9 43279 4 0 1.9 -5.3 5.6 43295 4 0 4.9 -1.6 5.1 43333 4 25 3.2 -9.9 10.4 43346 4 0 9.2 3.2 9.8 43353 3 0 5.5 -5.4 7.7 43369 4 0 3.4 -4.0 5.2 43371 3 0 5.1 -4.6 6.8

13




WMO OBS % SD BIAS RMS IDENT RECD REJ 42101 4 0 4.1 1.1 4.3 42182 7 0 2.7 1.9 3.3 42339 4 0 1.7 5.5 5.8 42369 5 0 1.2 0.8 1.5 42410 1 0 0.0 1.5 1.5 42492 4 25 3.7 1.2 3.9 43003 4 0 2.8 -1.6 3.2 43128 6 0 6.5 0.7 6.6 43150 4 25 10.3 -4.6 11.3 43185 4 0 6.5 4.7 8.0 43279 1 0 0.0 2.0 2.0 43285 1 0 0.0 -1.9 1.9 43295 3 0 7.0 -0.7 7.0 43353 4 50 4.6 -7.7 9.0 43369 3 0 3.6 3.5 5.0 43371 3 33 8.9 -2.1 9.2

14




WMO OBS % SD BIAS RMS IDENT RECD REJ 42027 4 0 7.9 8.9 11.9 42065 4 0 3.8 -1.0 4.0 42101 5 0 1.5 0.5 1.5 42182 7 29 2.1 1.3 2.4 42314 7 0 2.3 1.2 2.6 42339 7 0 8.5 1.0 8.6 42348 5 0 2.0 3.3 3.9 42361 3 0 10.9 -0.9 11.0 42369 7 14 1.6 0.6 1.7 42379 4 0 0.9 -0.1 0.9 42397 7 0 1.8 0.7 1.9 42410 7 0 3.8 -0.8 3.9 42492 7 0 2.0 1.7 2.7 42647 5 0 3.1 0.3 3.1 42667 6 0 2.3 1.4 2.7 42701 7 0 8.8 -2.6 9.2 42724 7 0 2.9 2.6 3.9 42867 8 13 1.9 1.3 2.3 42874 6 0 3.4 0.6 3.4 42971 5 20 1.5 0.5 1.6 43003 6 0 1.9 0.2 1.9 43014 6 0 2.4 0.7 2.5 43041 6 0 3.8 -1.4 4.0 43128 7 0 3.3 1.2 3.5 43150 8 13 1.8 1.5 2.3 43185 6 0 1.5 2.8 3.2 43192 6 0 1.9 -0.1 1.9 43279 7 0 1.5 0.7 1.6 43285 3 0 1.4 0.8 1.6 43295 7 0 0.6 1.1 1.3 43333 6 0 2.2 2.7 3.5 43346 7 0 0.8 0.7 1.0 43353 8 0 1.8 1.2 2.2 43369 7 0 2.1 1.5 2.6 43371 6 0 2.3 0.4 2.3

15




WMO OBS % SD BIAS RMS IDENT RECD REJ 42027 2 50 0.8 23.8 23.8 42101 6 0 3.6 3.6 5.1 42182 7 14 1.9 1.8 2.6 42339 6 0 1.2 3.2 3.4 42369 6 0 2.4 0.1 2.4 42410 5 0 5.3 -2.0 5.7 42492 6 0 1.6 0.0 1.6 42667 7 0 2.7 1.1 2.9 42724 7 0 0.8 -0.2 0.9 42971 2 0 2.2 -1.5 2.6 43003 5 0 2.2 -0.3 2.3 43128 6 0 1.6 2.1 2.6 43150 7 0 1.8 0.3 1.8 43185 6 0 1.7 0.9 1.9 43279 5 20 2.1 0.7 2.2 43285 3 0 1.8 2.5 3.1 43295 7 0 1.4 1.3 1.9 43353 7 0 1.8 1.3 2.2 43369 7 14 0.5 2.1 2.1 43371 6 0 1.1 0.3 1.1

16

TABLE 7a: NCMRWF RAWINSONDE MONITORING STATISTICS FOR WMO BLOCK 42 AND 43 STATIONS ONLY

100 HPA ZONAL WIND INCREMENTS - 26 11 2007 TO 2 12 2007(00Z)

UNIT IS METERS/SEC

WMO OBS % SD BIAS RMS IDENT RECD REJ 42182 7 0 7.3 -10.1 12.4 42339 4 0 2.8 -15.9 16.1 42369 6 0 5.0 -12.0 13.0 42410 4 0 3.8 -5.6 6.8 42867 7 0 9.3 -3.6 9.9 43003 5 0 23.2 1.0 23.2 43128 4 25 8.0 -4.4 9.1 43150 6 0 10.3 -3.3 10.8 43185 6 0 6.5 -0.6 6.6 43279 2 0 7.4 -3.6 8.3 43295 2 0 0.1 2.0 2.0 43333 4 25 4.8 -3.3 5.9 43346 3 0 5.0 -5.3 7.2 43369 3 0 3.1 -0.5 3.1

17

TABLE 7b: NCMRWF RAWINSONDE MONITORING STATISTICS FOR WMO BLOCK 42 AND 43 STATIONS ONLY


UNIT IS METERS/SEC

WMO OBS % SD BIAS RMS IDENT RECD REJ 42101 3 0 10.5 -4.1 11.3 42182 7 0 7.9 1.3 8.0 42339 4 0 4.3 -8.7 9.7 42369 5 0 5.8 -12.0 13.3 42410 1 0 0.0 -2.6 2.6 43003 4 0 6.6 -10.7 12.6 43128 5 0 9.6 -3.2 10.1 43150 3 0 8.0 4.1 9.0 43185 4 0 5.2 -5.7 7.7 43279 1 0 0.0 3.2 3.2 43285 1 0 0.0 4.4 4.4 43295 1 0 0.0 -9.1 9.1 43369 3 0 13.0 2.3 13.2 43371 1 0 0.0 10.8 10.8

18



UNIT IS METERS/SEC

WMO OBS % SD BIAS RMS IDENT RECD REJ 42027 3 0 10.5 -23.6 25.8 42065 3 0 2.7 -15.6 15.8 42101 5 0 3.7 2.0 4.2 42182 7 0 9.3 2.0 9.6 42314 5 0 2.6 0.0 2.6 42339 7 0 3.4 1.4 3.7 42348 4 0 5.8 -1.8 6.1 42361 2 0 14.5 -2.3 14.7 42369 7 0 2.7 -3.9 4.7 42410 7 14 2.9 -1.1 3.1 42492 7 0 9.1 -6.2 11.0 42667 4 0 1.6 -0.4 1.7 42701 4 0 3.9 -5.4 6.7 42724 7 0 4.6 -0.6 4.7 42867 8 0 2.5 -1.9 3.1 42874 6 17 3.1 -1.1 3.2 42971 5 20 5.1 -2.3 5.6 43003 6 0 5.6 -2.6 6.2 43014 4 0 2.1 -1.4 2.5 43041 5 0 5.2 1.8 5.5 43128 7 0 3.3 -1.0 3.4 43150 8 0 2.9 0.1 2.9 43185 6 0 3.7 0.5 3.7 43192 6 0 4.0 1.2 4.2 43279 4 0 5.0 0.8 5.0 43285 2 0 0.5 1.5 1.5 43295 5 20 3.5 2.9 4.5 43333 6 0 2.8 0.6 2.9 43346 4 0 4.6 -0.5 4.6 43353 1 0 0.0 -1.1 1.1 43369 7 0 3.3 -0.2 3.3 43371 5 0 3.9 -1.4 4.2

19



UNIT IS METERS/SEC

WMO OBS % SD BIAS RMS IDENT RECD REJ 42027 2 0 6.8 -19.5 20.7 42101 6 0 3.5 -2.0 4.0 42182 7 14 3.1 0.0 3.1 42339 6 0 3.4 -0.2 3.4 42369 6 0 2.8 3.3 4.3 42410 5 0 3.4 2.2 4.1 42492 5 0 4.8 6.5 8.1 42667 6 0 4.0 -0.9 4.1 42724 7 0 3.8 0.3 3.8 42971 2 0 1.4 -3.6 3.9 43003 5 0 1.2 -4.6 4.8 43128 5 0 4.1 -3.2 5.2 43150 7 0 2.9 -2.3 3.7 43185 6 0 2.4 -1.6 2.9 43279 3 0 2.6 1.9 3.2 43285 3 0 2.0 0.2 2.1 43295 5 20 3.1 -1.3 3.3 43369 7 0 5.9 -0.2 5.9 43371 6 0 4.8 -1.2 5.0

20


100 HPA MERIDIONAL WIND INCREMENTS - 26 11 2007 TO 2 12 2007(00Z)

UNIT IS METERS/SEC

WMO OBS % SD BIAS RMS IDENT RECD REJ 42182 7 0 3.7 -3.1 4.8 42339 4 0 1.3 0.6 1.4 42369 6 0 2.0 0.8 2.1 42410 4 0 5.2 2.6 5.8 42867 7 0 3.3 0.4 3.3 43003 5 0 7.3 1.9 7.5 43128 4 0 3.7 -0.5 3.7 43150 6 0 5.9 2.0 6.2 43185 6 0 3.1 2.0 3.7 43279 2 0 6.1 -0.1 6.1 43295 2 0 6.6 -2.6 7.1 43333 4 0 3.0 -4.8 5.7 43346 3 0 0.9 -5.6 5.7 43369 3 0 3.2 -11.3 11.7

21



UNIT IS METERS/SEC

WMO OBS % SD BIAS RMS IDENT RECD REJ 42101 3 0 3.2 -6.1 6.9 42182 7 0 12.2 -12.0 17.1 42339 4 0 3.0 -3.5 4.6 42369 5 0 2.3 -4.1 4.6 42410 1 0 0.0 0.3 0.3 43003 4 0 2.4 -0.7 2.5 43128 5 0 2.6 -1.1 2.9 43150 3 0 4.1 6.0 7.2 43185 4 0 1.2 -1.8 2.1 43279 1 0 0.0 0.1 0.1 43285 1 0 0.0 -2.4 2.4 43295 1 0 0.0 0.6 0.6 43369 3 0 18.1 18.4 25.8 43371 1 0 0.0 4.3 4.3

22



UNIT IS METERS/SEC

WMO OBS % SD BIAS RMS IDENT RECD REJ 42027 3 0 6.1 0.1 6.1 42065 3 0 2.4 5.6 6.1 42101 5 0 3.9 -1.8 4.3 42182 7 0 4.4 -2.5 5.0 42314 5 0 2.3 -3.1 3.9 42339 7 0 4.5 -0.7 4.6 42348 4 0 4.7 -0.8 4.7 42361 2 0 4.1 4.6 6.2 42369 7 0 7.2 -2.2 7.5 42410 7 0 5.3 -1.4 5.5 42492 7 0 6.6 2.0 6.9 42667 4 0 2.0 -1.5 2.5 42701 4 0 2.8 -7.4 7.9 42724 7 0 2.4 0.1 2.4 42867 8 0 2.4 -0.3 2.4 42874 6 0 2.8 -0.4 2.8 42971 5 0 4.0 1.5 4.3 43003 6 0 2.0 -2.2 2.9 43014 4 0 2.7 -0.4 2.7 43041 5 0 3.9 0.8 4.0 43128 7 0 2.5 2.7 3.7 43150 8 0 2.8 2.0 3.4 43185 6 0 3.0 2.8 4.1 43192 6 0 4.5 0.7 4.5 43279 4 0 3.5 3.4 4.9 43285 2 0 3.0 0.4 3.1 43295 5 0 2.3 -0.4 2.3 43333 6 0 2.8 -0.2 2.8 43346 4 0 1.6 0.7 1.7 43353 1 0 0.0 2.8 2.8 43369 7 0 1.9 0.1 1.9 43371 5 0 1.5 3.8 4.1

23



UNIT IS METERS/SEC

WMO OBS % SD BIAS RMS IDENT RECD REJ 42027 2 0 7.2 5.7 9.2 42101 6 0 2.3 -0.1 2.3 42182 7 0 1.1 -2.5 2.8 42339 6 0 1.9 -0.5 1.9 42369 6 0 1.0 -1.5 1.8 42410 5 0 3.1 -3.1 4.4 42492 5 0 5.1 -4.1 6.5 42667 6 0 3.0 -2.8 4.1 42724 7 0 3.2 0.2 3.3 42971 2 0 1.7 4.7 5.0 43003 5 0 1.4 -0.5 1.5 43128 5 0 4.2 1.6 4.5 43150 7 0 4.3 2.2 4.8 43185 6 0 2.5 1.4 2.9 43279 3 0 2.5 5.8 6.3 43285 3 0 2.1 1.7 2.8 43295 5 0 1.9 2.5 3.1 43369 7 0 2.7 3.3 4.3 43371 6 0 1.9 3.6 4.1

24

14. Explanatory Note On Tables And Figures

General

The material presented in this report is based on the data that is received by the India Meteorological department and relayed to the NCMRWF in a delayed mode. Half hourly data are received 48 times a day, with an average delay of almost 20 minutes from the real time, from 01 April 1997. Analysis is performed for all the four synoptic hours, and therefore the assimilation cycle is run continuously to produce the first-guess (six-hour forecast) for the analysis step. The five-day forecast however, is started only from the 00Z initial conditions.

Data Availability

The average number of reports of each type received per day in a 5-degree

square box and rounded off to the nearest integer is indicated for the whole globe (Fig. 1.1 – 1.7). Four such numbers are actually displayed inside a 10-degree box for convenience. The integer 0 means that the average number of observations in the smaller box was less than 0.5. If no observation was received at all in the smaller box, then no number is printed for that smaller box.

Histograms for the number of daily reports of a particular type received at the

NCMRWF are shown (Fig. 2.1 – 2.7). This is important in monitoring the steadiness of the reception rate. It can be seen that on some days the number of reports received fall off drastically. In most of the cases they are traced to computer problems at the data reception centre.

Monitoring of quality and quantity of Global Radiosonde Reports (land) by

Complex Quality Control (CQC). Table 1 presents the total number of land radiosonde reports received for the

month (by WMO Blocks), the number of hydrostatic errors detected in these reports by the CQC and the percent of corrections performed that are confident corrections.

Indian data frequency

Table 2 shows the number of times an upper air station within WMO block 42

or 43 reported in this month. The lists of stations are in accordance with the latest WMO directory. The numbers for 00Z, 06Z, 12Z and 18Z are listed in separate columns. All stations that are expected to report are listed including those stations, which did not report even once during the whole month. It is seen that there are variations in reporting frequencies.

Indian data Quality

Tables 3-6 represent the results of quality monitoring statistics carried out at

the NCMRWF for the upper air stations under the WMO blocks 42 and 43 only. The conventional procedure is followed, which is that of first computing the normalized magnitude of the observation minus, first guess interpolated to the observation point ( the ‘residual’) and then comparing this value against a preset limit as well checking the consistency of this value against similar values in the neighborhood. The rationale of this approach is based on the work of A. Hollingsworth et. al., Weekly Weather Review, Vol.114, No.5, May 1986 where the authors demonstrated the ability of modern data

25

assimilation system to monitor the quality of an observational network. However, in the tropics these results have to be accepted with caution for two reasons:

(1) As mentioned before, the above procedure assumes high quality first guess,

which is not guaranteed in a data sparse area like the tropics.

(2) Since small scale features like convection play a dominant role in the tropical atmosphere, sometimes there might be a mismatch between this scale and that of the first guess which is determined by the forecast model.

Tables 3a and 3b present the number of observations received, rejection by the

analysis (in percentage), total bias, standard deviation and root mean square for the 100 hPa geo-potential heights, for 00Z and 12Z respectively in units of meters. Tables 4a and 4b are similar tables for 500 hPa geo-potential heights. Tables 5a and 5b present similar results for 100 hPa dry temperatures and tables 6a and 6b present similar results for 500 hPa dry temperatures. Tables 7a and 7b show similar results for 100 hPa zonal winds, and tables 8a and 8b similar results for 500 hPa zonal winds. Tables 9a and 9b show similar results for 100 hPa meridional winds and tables 10a and 10b present similar results for 500 hPa meridional winds.

SYNOP - Number of Reports For 26/11 to 02/12, 2007

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

1 2 3 4 5 6 7

Fig. 2.1

-- R

epor

ts --

>

TEMP - Number of Reports For 26/11 to 02/12, 2007

1060

1080

1100

1120

1140

1160

1180

1200

1220

1240

1 2 3 4 5 6 7

Fig. 2.2

-- R

epor

ts --

>

PILOT - Number of Reports For 26/11 to 02/12, 2007

0

100

200

300

400

500

600

700

800

900

1 2 3 4 5 6 7

Fig. 2.3

-- R

epor

ts --

>

AIREP - Number of Reports For 26/11 to 02/12, 2007

0

20000

40000

60000

80000

100000

120000

140000

160000

1 2 3 4 5 6 7

Fig. 2.4

-- R

epor

ts --

>

SATOB - Number of Reports For 26/11 to 02/12, 2007

0

5000

10000

15000

20000

25000

30000

35000

40000

1 2 3 4 5 6 7

Fig. 2.6

-- R

epor

ts --

>

BUOY - Number of Reports For 26/11 to 02/12, 2007

0

5000

10000

15000

20000

25000

30000

35000

1 2 3 4 5 6 7

Fig. 2.7

-- R

epor

ts --

>

ncmrwf weekly data monitoring report 26/11/2007 to 02/12… · ncmrwf weekly data monitoring report...

Documents