Convective Contribution to Hurricane Genesis

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Presentation transcript:

Convective Contribution to Hurricane Genesis Robert A. Houze, Jr. University of Washington Wen-Chau Lee and Michael M. Bell National Center for Atmospheric Research UW, Atmos. Sci., Clouds and Precipitation Seminar, Seattle, 5 June 2008

Mesoscale convective system lifecycle ~200 km

Convection in an intensifying tropical depression--idealized Zipser & Gautier 78 Ritchie & Holland 97 Bister & Emanuel 97 Hendricks et al. 03 Montgomery et al. 06 (d)

Hurricane Ophelia (2005) Ophelia formed from a non-tropical weather system. A cold front moved off the eastern coast of the United States on 1 September. The front moved southeastward and became part of an elongated trough of low pressure that extended from Tropical Depression Lee east of Bermuda to near the Florida Peninsula. Two areas of low pressure formed in the trough on 4 September. The eastern low, south of Bermuda, eventually became Hurricane Nate. The western low, near the Bahamas, became Ophelia.

Ophelia formed from a non-tropical weather system Ophelia formed from a non-tropical weather system. A cold front moved off the eastern coast of the United States on 1 September. The front moved southeastward and became part of an elongated trough of low pressure that extended from Tropical Depression Lee east of Bermuda to near the Florida Peninsula. Two areas of low pressure formed in the trough on 4 September. The eastern low, south of Bermuda, eventually became Hurricane Nate. The western low, near the Bahamas, became Ophelia. 500 mb

NOAA Hurricane Field Program Flight Plan for “Convective Burst”

dBZ, vorticity, pv

Stratiform region

Stratiform region

Stratiform region

Stratiform region sounding (“onion sounding”)

Stratiform region 30 20 10

Conclusions Convective cells extremely deep & intense Downdraft convergence absent--buoyancy probably due to wind-induced mixing PV generated in convective cells at low-mid levels Stratiform region accumulates vorticity generated in cells Vorticity in both convective and stratiform regions is axisymmetrized into the parent vortex Stratiform region downdrafts not significant

Extra slides

Convection in an intensifying tropical depression--idealized Zipser & Gautier 78 Ritchie & Holland 97 Bister & Emanuel 97 Hendricks et al. 03 Montgomery et al. 06 (d)