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*Work in Progress

Various Features Influencing Convection Initiation on 12 June 2002 during IHOP_2002* Tammy M. Weckwerth (NCAR). Hanne V. Murphey (UCLA) Cyrille Flamant (CNRS) Crystalyne R. Pettet (US NWS) Roger M. Wakimoto (NCAR) Sophie Bastin (NCAR). *Work in Progress.

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*Work in Progress

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  1. Various Features Influencing Convection Initiation on 12 June 2002 during IHOP_2002*Tammy M. Weckwerth (NCAR) Hanne V. Murphey (UCLA)Cyrille Flamant (CNRS) Crystalyne R. Pettet (US NWS) Roger M. Wakimoto (NCAR)Sophie Bastin (NCAR) *Work in Progress WWRP Symposium on Nowcasting and Very Short Range Forecasting, Toulouse, France, 5-9 September 2005

  2. GOES 11

  3. Composite Radar

  4. Why did CI occur here? 12 June 2002 Are the intersections between the waves and outflow preferred regions for CI? Does the mesolow play a role in CI? Are the rolls a factor in CI?

  5. CI 19 km from drop line 2050 UTC

  6. Dropsonde Leg 2 – CAPE & CIN Outflow boundary NE SW • Incomplete soundings – only up to 6 km AGL (445 mb) • No drops in CI air mass

  7. dBZe vr div vort ELDORA Observations of Waves • Gravity waves in all fields: λ = 6-8 km • Consistent with P-3, MIPS, GOES-11 and radar • ELDORA fields @ 900 m AGL

  8. ELDORA and Leandre II Wave Impacts km • ELDORA and Leandre II fields @ 400 m AGL • Periodic signature in q, div and vort: λ=6-8 km

  9. Freedom OK Mesonet – 18 UTC – Mesolow Impact • LLJ feeding region of interest • Dewpoints in the high 60s and low 70s

  10. Mixing Ratio Wind Speed Moisture Convergence Wind Direction Freedom, OK MesonetMesolow Impact • Local increase in southerly flow, perhaps due to mesolow – not observed further south • Increase in moisture convergence

  11. θ q w Roll Observations 10 km • ELDORA reflectivity and winds @ 400 m AGL • 1.1 km in situ fields show rolls (λ~3.6 km) SE of TP

  12. Preliminary results • Mesolow may have aided in enhancing moisture convergence in CI region. • Waves sampled by ground-based radar, satellite, in situ P-3, low-level MIPS w, ELDORA. Suggestion of Leandre II mixing ratio modulation caused by waves – may be important for CI. • Rolls observed near CI location with radar and in-situ P-3 – may be important for CI.*

  13. GOES-11 Cloud Tracking • 1st clouds formed along rolls • Northern cloud formed near wave/outflow intersection

  14. Ongoing work • Closely examine ELDORA and Leandre II measurements near CI location • Modeling study by Sophie Bastin (presented next)

  15. Thank you.

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