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Wind Structure in Stratiform Rainbands over Land

Wind Structure in Stratiform Rainbands over Land. Shaunna Donaher MPO Student Seminar December 1, 2010. UM South Campus/CSTARS Aug-Sept 2008 W-Band radar X-Band radar WSR-88D Wind Profiler (MAPR) Met. Obs Rain gauge array Radiosondes (2-3 /day) Ceilometer Disdrometer

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Wind Structure in Stratiform Rainbands over Land

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  1. Wind Structure in Stratiform Rainbands over Land Shaunna Donaher MPO Student Seminar December 1, 2010

  2. UM South Campus/CSTARS Aug-Sept 2008 W-Band radar X-Band radar WSR-88D Wind Profiler (MAPR) Met. Obs Rain gauge array Radiosondes (2-3 /day) Ceilometer Disdrometer Microwave Rain Radar (X-band) Experiment Description Image from maps.google.com CSTARS

  3. Rainband Breakdown

  4. Motivation and Background • Why do we care about the wind structure over land? • Describes conditions in an urban coastal environment as rainband passes over • Impact of wind speeds on tall buildings

  5. Method: VAD Analysis • Technique • Why location was good

  6. Method: Exponential Fit • zo, d, z and u* • zo ~0.8-1.4m in centers of large towns • zo ~1.5-2.5m in centers of cities with tall buildings • zo ~10m in Appalachian Mnts • zo ~60m in Rocky Mnts Band 9b Results zo= 0.9628 (0.61-2.69) u*=0.2321 (0.17-0.45) d=0 d small/stable Average Results zo= 1.5023 u*=0.2443 d=0 d large/unstable

  7. Extrapolating Low-Level Winds • For each band:

  8. Comparison of Calculated Low-Level Winds With CSTARS Tower

  9. Comparison of fit and wxt at surface (10 m)

  10. Mid-levels: Inflection point Correlation= -0.35

  11. High levels • Structure above inflection point • Jets • Direction shifts • Individual profiles

  12. Summary/Conclusions

  13. Future Work

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