Doppler Weather Radar - METNET - India Meteorological Department

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2. Range and Velocity ambiguities do no occur 3. Clutters are minimal if not totally eliminated. 4. High Data Resolution in Range/Velocity/Reflectivity values 5. Minimal noise 6. Scan to scan interval should be such that even the shortest lived phenomena like Tornado/Thunderstorm are not missed by radar scans. Ideally, very close-temporal spaced scans (even closer than 5 minutes) enable continuity of data especially for better rainfall accumulation estimations, volume scans with closely spaced elevation angles provide better data sets. But both result in high/voluminous data sets causing data handling/storage problems. When no weather is expected, far-temporal spaced scans will be enough to monitor the changes in the atmosphere and to provide nearby clear-air-return based velocity data. Scan strategy should therefore be different to suit different situations/locations of radar/seasons etc. The scan schedule for weather seasons like Pre-monsoon season, Monsoon season and Post monsoon season generally designed as follows: 1. A long range single elevation scan, generally up to 500 km range, with lowest elevation angle possible is done to have general observation of the atmosphere around the radar site. 2. A medium range (upto 250 km) multiple elevations scan, called a volume scan is done for detailed probing of atmosphere. 3. RHI scan is set in WSR-98D/S as a real-time display continually or occasionally as required. This scan is generally done to probe the vertical extent of severe/tall clouds which is usually seen is Thunderstorms/Cyclones/Norwesters. D.2.1. Cone of silence Close to the radar, data are not available due to the radar’s maximum tilt elevation. This area is commonly referred to as the radar’s "Cone of Silence". Figure D.6. Cone of Silence D.2.2. Operation of Doppler Weather Radars in IMD 1. Scientific objectives 82
According to the need of IMD, purpose of Installation and operation of DWR network is to investigate severe weather, heavy precipitation events with special emphasis on thunderstorm, squall, microburst, tornado etc. and to generate Nowcasting to the stack holders. 2. Location details of Doppler Weather Radar Palam: DWR PALAM Location : COORDINATES : 28° 33′ 34″ N, 77 o 04′ 33″ E, ELEVATION : 226.83m AMSL The DWR operations and products transmission to the IMD-Central server and FTP server installed in Mausam Bhawan,Lodi Road, New Delhi are fixed. The DWR Palam obtains a volume scan consisting 360 degree azimuth sweeps with the antenna speed 6 rpm. Basically there are two main scan strategy employed for operation of IMD DWRs, named as IMD-B and IMC C. IMD-B consisting a set of 10 nos of elevation angles (0.5,1.0,2.0,3.0,4.5,6.0,9.0,12.0, 16.0,21.0) while IMD-C consisting a set of 3 nos of elevation angles(0.5,1.0,2.0). The scan time for IMD-B is 6.0 min. while for IMD-C is 2.0 min. and total time for IMD-B & IMD-C, means set of one observation (for both tasks) is 10.0 min. including 2.0 min sleeping time. D.2.3. Present IMD DWR Scan strategy (DWR-Palam) Figure D.7. Present Scan strategy in operation at (DWR-Palam) DWR 83
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Ministry of Earth Sciences INDIA ME
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Preface Introduction Definitions Pu
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3.8 To copy RAW DATA 35 3.9 Procedu
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B.3.3 Velocity Products 69 B.3.4 Hy
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PREFACE India Meteorological Depart
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DEFINITION An important aspect of a
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MONITORING OF DWR SYSTEM CHAPTER 1
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Before controlling radar operations
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5. Power Cabinet: “SERVO POWER AM
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9. Checking real time displays:-The
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2. In Modem, PMA always shows off w
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This can be done by “telnet” co
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drwxr-xr-x 3 501 500 4096 Aug 10 02
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Figure 1.8 Connecting to MAIN serve
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Thus now the tasks are configured a
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STEP 1 : Invoke “iris” though t
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STEP 6 : Skip time : This is the ti
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3. Edit the Product as needed , the
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(ii) SC. (E) In-Charge Radar Lab, D
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Station and print-out (except Daily
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2.2.5. A-log book Details of all ad
Page 43 and 44: Table 2.8 VPN connectivity status S
Page 45 and 46: Step-II. connected Copy image files
Page 47 and 48: 3.7. To search for a file [operator
Page 49 and 50: PCO name: IMD-B, TCO name: IMD-B PR
Page 51 and 52: # Filename: transmet_gif # Sends fi
Page 53 and 54: 9. To liaise with other DWR station
Page 55 and 56: • Detection of deterioration caus
Page 57 and 58: ack-mounted modules which do not re
Page 59 and 60: Screenshot 2 : Calibration Control
Page 61 and 62: Antenna Waveguide Switch, Circulato
Page 63 and 64: 4.3.3 Bitex data point configuratio
Page 65 and 66: APPENDIX A AN OVERVIEW OF DOPPLER W
Page 67 and 68: A.1.1. Future IMD Radar Network pla
Page 69 and 70: IRIS/Display Installed at remote wo
Page 71 and 72: APPENDIX B WSR 98D/S DWR SYSTEM CHA
Page 73 and 74: e. Elevation limits -- Upper and lo
Page 75 and 76: B.1.9. Calibrations and health moni
Page 77 and 78: B.2.6. Unambiguous range a. Reflect
Page 79 and 80: The System is capable of generating
Page 81 and 82: 1. System generates hail, thunderst
Page 83 and 84: 1.5. There is provision of DVD Writ
Page 85 and 86: 6. Wait for ten minutes. Calibrate
Page 87 and 88: SA9-15 Current at position 15 of A1
Page 89 and 90: Test procedure (1) Type the “zaut
Page 91 and 92: 4. Observe that the PFN voltage goe
Page 93: Table D.1. PPI and RHI scanning typ
Page 97 and 98: Chennai@8min, Machilipatnam, Vishak
Page 99 and 100: D.2.5. Scan strategies being follow
Page 101 and 102: High Voltage (Power On) Avoid conta
Page 103 and 104: Average power densities less than 5
Page 105 and 106: E.3. Antenna/Pedestal Safety WARNIN
Page 107 and 108: ACKNOWLEDGEMENTS Several experts ha
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