Vortex Structure and Evolution within Bow Echoes. Part I: Single-Doppler and Damage Analysis of the 29 June 1998 Derecho
Authors:
- Nolan T. AtkinsNANolan T. Atkins
- Justin M. ArnottJAJustin M. Arnott
- Ron W. PrzybylinskiRPRon W. Przybylinski
- Ray A. WolfRWRay A. Wolf
- Bradley D. KetchamBKBradley D. Ketcham
- 1 September 2004
- journal article
- Published by American Meteorological Society in Monthly Weather Review
- Vol. 132 (9) , 2224-2242
Abstract
Single-Doppler radar along with damage observations are examined to investigate the structural evolution of vortices observed within the 29 June 1998 derecho event that propagated through southeastern Iowa into central and eastern Illinois. A total of 13 meso-γ-scale vortices observed primarily at low levels (0–3 km AGL) along the leading edge of the convective system were detected by the Weather Surveillance Radar-1988 Doppler (WSR-88D) radars at Davenport, Iowa, and Lincoln, Illinois. All but one of the vortices formed after the system evolved into a bow echo. Ten of the vortices formed north of the apex while three formed south of the apex. Seven of the vortices produced tornadoes that created F0–F1 surface damage. None of the vortices exhibited appreciable upscale growth. Careful analysis of the radar data suggests that it may be possible to discern between the tornadic and nontornadic vortices. The tornadic vortices tended to be stronger, longer-lived, and deeper than their nontornadic count... Abstract Single-Doppler radar along with damage observations are examined to investigate the structural evolution of vortices observed within the 29 June 1998 derecho event that propagated through southeastern Iowa into central and eastern Illinois. A total of 13 meso-γ-scale vortices observed primarily at low levels (0–3 km AGL) along the leading edge of the convective system were detected by the Weather Surveillance Radar-1988 Doppler (WSR-88D) radars at Davenport, Iowa, and Lincoln, Illinois. All but one of the vortices formed after the system evolved into a bow echo. Ten of the vortices formed north of the apex while three formed south of the apex. Seven of the vortices produced tornadoes that created F0–F1 surface damage. None of the vortices exhibited appreciable upscale growth. Careful analysis of the radar data suggests that it may be possible to discern between the tornadic and nontornadic vortices. The tornadic vortices tended to be stronger, longer-lived, and deeper than their nontornadic count...Keywords
This publication has 32 references indexed in Scilit:
- Examination of Derecho Environments Using Proximity SoundingsWeather and Forecasting, 2001
- Long-Lived Mesoconvective Vortices and Their Environment. Part II: Induced Thermodynamic Destabilization in Idealized SimulationsMonthly Weather Review, 2000
- Analysis of a Nontornadic Storm during VORTEX 95Monthly Weather Review, 2000
- Descending and Nondescending Tornadic Vortex Signatures Detected by WSR-88DsWeather and Forecasting, 1999
- A Climatology of Derecho-Producing Mesoscale Convective Systemsin the Central and Eastern United States, 1986–95. Part I: Temporal and Spatial DistributionBulletin of the American Meteorological Society, 1998
- Three-Dimensional Evolution of Simulated Long-Lived Squall LinesJournal of the Atmospheric Sciences, 1994
- Observations of a Colorado Tornado. Part II: Combined Photogrammetric and Doppler Radar AnalysisMonthly Weather Review, 1992
- A Mesoscale Convective Complex-Generated Inertially Stable Warm Core VortexMonthly Weather Review, 1989
- A Theory for Strong, Long-Lived Squall LinesJournal of the Atmospheric Sciences, 1988
- Results of Detailed Synoptic Studies of Squall LinesTellus, 1955