*Work in Progress
description
Transcript of *Work in Progress
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Various Features Influencing Convection Initiation on
12 June 2002 during IHOP_2002*
Tammy M. WeckwerthTammy M. Weckwerth (NCAR)
WWRP Symposium on Nowcasting and Very Short Range Forecasting, Toulouse, France, 5-9 September 2005
*Work in Progress
Hanne V. MurpheyHanne V. Murphey (UCLA)Cyrille FlamantCyrille Flamant (CNRS)
Crystalyne R. PettetCrystalyne R. Pettet (US NWS) Roger M. WakimotoRoger M. Wakimoto (NCAR)
Sophie BastinSophie Bastin (NCAR)
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GOES 11
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Composite Radar
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12 June 2002
Are the intersections between the waves and outflow preferred regions for CI?
Why did CI occur here?
Are the rolls a factor in CI?
Does the mesolow play a role in CI?
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2050 UTC
CI 19 km from drop line
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• Incomplete soundings – only up to 6 km AGL (445 mb)• No drops in CI air mass
NE SW
Outflow boundary
Dropsonde Leg 2 – CAPE & CIN
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ELDORA Observations of Waves
• ELDORA fields @ 900 m AGL
• Gravity waves in all fields: λ = 6-8 km• Consistent with P-3, MIPS, GOES-11 and radar
dBZe vr
div vort
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ELDORA and Leandre II Wave Impacts
• ELDORA and Leandre II fields @ 400 m AGL• Periodic signature in q, div and vort: λ=6-8 km
km
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OK Mesonet – 18 UTC – Mesolow Impact
• LLJ feeding region of interest• Dewpoints in the high 60s and low 70s
Freedom
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Wind Direction
Wind Speed Mixing Ratio
Moisture Convergence
Freedom, OK MesonetMesolow Impact
• Local increase in southerly flow, perhaps due to mesolow – not observed further south
• Increase in moisture convergence
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Roll Observations
• ELDORA reflectivity and winds @ 400 m AGL• 1.1 km in situ fields show rolls (λ~3.6 km) SE of TP
qθ
w
10 km
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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.*
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GOES-11 Cloud Tracking
• 1st clouds formed along rolls
• Northern cloud formed near wave/outflow intersection
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Ongoing work
• Closely examine ELDORA and Leandre II measurements near CI location
• Modeling study by Sophie Bastin (presented next)
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Thank you.