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Typical(?) Diurnal Variation of Radar Echo over Bangla.

Typical(?) Diurnal Variation of Radar Echo over Bangla. Toru Terao(Osaka Gakuin Univ.) Md. N. Islam(BUET, Banlgadesh). Bangladesh RADAR. Four RADAR data Dhaka RADAR is used mainly Intensive rawin sonde obs. Dhaka RADAR.

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Typical(?) Diurnal Variation of Radar Echo over Bangla.

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  1. Typical(?) Diurnal Variation of Radar Echo over Bangla. Toru Terao(Osaka Gakuin Univ.) Md. N. Islam(BUET, Banlgadesh)

  2. Bangladesh RADAR • Four RADAR data • Dhaka RADAR is used mainly • Intensive rawin sonde obs.

  3. Dhaka RADAR • Continuous observations are conducted basically only for one hour duration for every other three hours, as follows; • 5-6, 8-9, 11-12, 14-15, 17-18, 20-21, 23-24BST. • Almost all area of this country except for southeastern most part is covered.

  4. NE part: Night-E. Morning S part: E. Morning C-W part: Daytime Fig10 Fig. 10. Same as Fig. 7 except averaged for 1 August to 30 August 2000.

  5. Echo Embedded Area Freq. of Occurrence Area & Number of Echoes Afternoon: many small echoes Midnight: max. echo area

  6. Statistical Results • NE part: • Heavy rain, Midnight-morning peak • Larger echoes • S part(coastal area): • Heavy rain, Morning peak • C-W part(plain): • Light rain, Afternoon peak • Many smaller echoes.

  7. A case study Convection: 17/18 July 2001 A typical pattern of the diurnal variation will be shown using Dhaka RADAR data. 17 July 18 July 8:30, 11:30, 14:30, 17:30, 20:30, and 23:30

  8. Convection: 17/18 July 2001 A typical pattern of the diurnal variation will be shown using Dhaka RADAR data. 8:30 17 July 18 July No conv.

  9. Convection: 17/18 July 2001 A typical pattern of the diurnal variation will be shown using Dhaka RADAR data. 11:30 17 July 18 July SW scattering

  10. Convection: 17/18 July 2001 A typical pattern of the diurnal variation will be shown using Dhaka RADAR data. 14:30 17 July 18 July SW developing

  11. Convection: 17/18 July 2001 A typical pattern of the diurnal variation will be shown using Dhaka RADAR data. 17:30 17 July 18 July E forming

  12. Convection: 17/18 July 2001 A typical pattern of the diurnal variation will be shown using Dhaka RADAR data. 20:30 17 July 18 July E -> NE Squall line

  13. Convection: 17/18 July 2001 A typical pattern of the diurnal variation will be shown using Dhaka RADAR data. 23:30 17 July 18 July NE spread

  14. Typical Diurnal Variation Patterns are strikingly similar for two days 17 and 18 July 2001 Morning to afternoon: Scattering convections over the south western part of Bangladesh We should clarify why such pattern appeared. Evening to Midnight: Organized convections over the north eastern part of Bangladesh

  15. Comparison with prev. study RADAR data Ohsawa et al. (2001) Midnight Noon

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