Aspects of a Tornadic Left-Moving Thunderstorm of 25 May 1999

John F. Dostalek Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, Colorado

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John F. Weaver NOAA/NESDIS/RAMM Team, Colorado State University, Fort Collins, Colorado

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G. Loren Phillips National Weather Service Forecast Office, Lubbock, Texas

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Abstract

A severe left-moving thunderstorm occurred on 25 May 1999 between the cities of Lubbock and Amarillo, Texas. Over its 3.5-h lifetime, the storm was responsible for flash flooding, reports of hail of up to 7 cm in diameter, and two weak tornadoes. Satellite imagery reveals that it was traveling along the northward-moving outflow boundary of the storm from which it formed. The left mover displayed anticyclonic rotation, as was seen in storm-relative radial velocity imagery from the Weather Surveillance Radar-1988 Doppler (WSR-88D) located at Lubbock. The tornadoes developed west of Canyon, Texas, near the intersection of the left mover and a southward-moving boundary. The occurrence of tornadoes with a left mover is a particularly noteworthy event; to the authors' knowledge, only four other tornadic left movers have been reported in the meteorological literature.

* Current affiliation: Atmospheric Science Group, Texas Tech University, Lubbock, Texas

Corresponding author address: John F. Dostalek, Research Associate, CIRA, Colorado State University, 1375 Campus Delivery, Fort Collins, CO 80523-1375. Email: dostalek@cira.colostate.edu

Abstract

A severe left-moving thunderstorm occurred on 25 May 1999 between the cities of Lubbock and Amarillo, Texas. Over its 3.5-h lifetime, the storm was responsible for flash flooding, reports of hail of up to 7 cm in diameter, and two weak tornadoes. Satellite imagery reveals that it was traveling along the northward-moving outflow boundary of the storm from which it formed. The left mover displayed anticyclonic rotation, as was seen in storm-relative radial velocity imagery from the Weather Surveillance Radar-1988 Doppler (WSR-88D) located at Lubbock. The tornadoes developed west of Canyon, Texas, near the intersection of the left mover and a southward-moving boundary. The occurrence of tornadoes with a left mover is a particularly noteworthy event; to the authors' knowledge, only four other tornadic left movers have been reported in the meteorological literature.

* Current affiliation: Atmospheric Science Group, Texas Tech University, Lubbock, Texas

Corresponding author address: John F. Dostalek, Research Associate, CIRA, Colorado State University, 1375 Campus Delivery, Fort Collins, CO 80523-1375. Email: dostalek@cira.colostate.edu

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  • Achtemeier, G. L., 1969: Some observations of splitting thunderstorms over Iowa on August 25–26, 1965. Preprints, Sixth Conf. on Severe Local Storms, Chicago, IL, Amer. Meteor. Soc., 89– 94.

    • Search Google Scholar
    • Export Citation
  • Andra D. L. Jr., , 1997: The origin and evolution of the WSR-88D mesocyclone recognition nomogram. Preprints, 28th Conf. on Radar Meteorology, Austin, TX, Amer. Meteor. Soc., 364–365.

    • Search Google Scholar
    • Export Citation
  • Brown, R. A., and Meitín R. J. , 1994: Evolution and morphology of two splitting thunderstorms with dominant left-moving members. Mon. Wea. Rev, 122 , 20522067.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Bunkers, M. J., 2002: Vertical wind shear associated with left-moving supercells. Wea. Forecasting, 17 , 845855.

  • Burgess, D. W., Lemon L. R. , and Achtemeier G. L. , 1976: Severe storm splitting and left-moving storm structure. The Union City, Oklahoma Tornado of 24 May 1973, R. A. Brown, Ed., NOAA Tech. Memo. ERL NSSL-80, National Severe Storms Laboratory, 63–66.

    • Search Google Scholar
    • Export Citation
  • Craven, J. P., Jewell R. E. , and Brooks H. E. , 2002: Comparison between observed convective cloud-base heights and lifting condensation level for two different lifted parcels. Wea. Forecasting, 17 , 885890.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Davies-Jones, R. P., 1985: Tornado dynamics. Thunderstorm Morphology and Dynamics, 2d ed., E. Kessler, Ed., University of Oklahoma Press, 197–236.

    • Search Google Scholar
    • Export Citation
  • Grasso, L. D., and Hilgendorf E. R. , 2001: Observations of a severe left-moving thunderstorm. Wea. Forecasting, 16 , 500511.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Hammond, G. R., 1967: Study of a left moving thunderstorm of 23 April 1964. ESSA Tech. Memo. IERTM-NSSL-31, Norman, OK, 75 pp.

  • Hart, J. A., and Korotky W. D. , 1991: The SHARP workstation— v1.50. A skew T/hodograph analysis and research program for the IBM and compatible PC. User's manual, NOAA/NWS Forecast Office, Charleston, WV, 62 pp.

    • Search Google Scholar
    • Export Citation
  • Johns, R. H., and Doswell C. A. III, 1992: Severe local storms forecasting. Wea. Forecasting, 7 , 588612.

  • Klemp, J. B., 1987: Dynamics of tornadic thunderstorms. Annu. Rev. Fluid Mech, 19 , 369402.

  • Klemp, J. B., and Wilhelmson R. B. , 1978: Simulations of right and left moving storms produced through storm splitting. J. Atmos. Sci, 35 , 10971110.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Markowski, P. M., Rasmussen E. N. , and Straka J. M. , 1998: The occurrence of tornadoes in supercells interacting with boundaries during VORTEX-95. Wea. Forecasting, 13 , 852859.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Monteverdi, J. P., Blier W. , Stumpf G. , Pi W. , and Anderson K. , 2001: First WSR-88D documentation of an anticyclonic supercell with anticyclonic tornadoes: The Sunnyvale–Los Altos, California, tornadoes of 4 May 1998. Mon. Wea. Rev, 129 , 28052814.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • NCDC, 1999: Storm Data. Vol. 41, No. 5, 372 pp.

  • Nielsen-Gammon, J. W., and Read W. L. , 1995: Detection and interpretation of left-moving severe thunderstorms using the WSR-88D: A case study. Wea. Forecasting, 10 , 127140.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Purdom, J. F. W., 1973: Meso-highs and satellite imagery. Mon. Wea. Rev, 101 , 180181.

  • Purdom, J. F. W., 1976: Some uses of high-resolution GOES imagery in the mesoscale forecasting of convection and its behavior. Mon. Wea. Rev, 104 , 14741483.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Rasmussen, E. N., and Blanchard D. O. , 1998: A baseline climatology of sounding-derived supercell and tornado forecast parameters. Wea. Forecasting, 13 , 11481164.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Rotunno, R., and Klemp J. B. , 1982: The influence of the shear-induced pressure gradient on thunderstorm motion. Mon. Wea. Rev, 110 , 136151.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Scofield, R. A., and Purdom J. F. W. , 1986: The use of satellite data for mesoscale analyses and forecasting applications. Mesoscale Meteorology and Forecasting, P. S. Ray, Ed., Amer. Meteor. Soc., 118–150.

    • Search Google Scholar
    • Export Citation
  • Weaver, J. F., and Nelson S. P. , 1982: Multiscale aspects of thunderstorm gust fronts and their effects on subsequent storm development. Mon. Wea. Rev, 110 , 707718.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Weisman, M. L., and Klemp J. B. , 1982: The dependence of numerically simulated convective storms on vertical wind shear and buoyancy. Mon. Wea. Rev, 110 , 504520.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Weisman, M. L., and Klemp J. B. , 1984: The structure and classification of numerically simulated convective storms in directionally varying wind shears. Mon. Wea. Rev, 112 , 24792498.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Weisman, M. L., and Klemp J. B. , 1986: The characteristics of isolated convective storms. Mesoscale Meteorology and Forecasting, P. S. Ray, Ed., Amer. Meteor. Soc., 331–358.

    • Search Google Scholar
    • Export Citation
  • Wilhelmson, R. B., and Klemp J. B. , 1978: A numerical study of storm splitting that leads to long-lived storms. J. Atmos. Sci, 35 , 19741986.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wilson, J. W., and Reum D. , 1988: The flare echo: Reflectivity and velocity signature. J. Atmos. Oceanic Technol, 5 , 197205.

    • Crossref
    • Search Google Scholar
    • Export Citation
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