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Regional and Mesoscale Meteorology Branch

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Enhanced-V

Instructors:

S. Bachmeier

B. Motta

A. Mostek

D. Bikos

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Topic:

Archived Training

Severe/Sat

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Developed:

1998

Introduction


This case reviews the use of the enhanced-V signature in the GOES-IR data. Previous studies by McCann(1981) have indicated the value of real-time satellite data in detecting and monitoring severe thunderstorms.

The goal of this teletraining session is to review the correct identification and interpretation of the enhanced-V.

Training Session Options


  1. Live VISIT teletraining (with an instructor leading the session). Check the VISIT Training Calendar to signup for teletraining. The session will last 60 minutes. This teletraining session uses the VISITview software, where a Windows PC with an Internet connection is needed.Please follow the teletraining installation instructions to install the session
  2. VISITview playback without Audio – You may step through the VISITview file on your own to view the presentation. If talking points are available, you may use these in tandem with going through the slides.

    Create a directory to download the playback file from the following site: http://rammb.cira.colostate.edu/training/visit/training_sessions/enhanced-v/enhanced-v.exe

    After extracting the files into that directory click on the visitlocal.bat file to start the lesson. Advance slides on your own using the navigation controls (i.e., the Next button will advance to the next slide)

Review and Final Remarks


This training installment used the 29 March 1998 Minnesota tornado case to provide an analysis of the enhanced-V satellite signature using GOES data. This signature is an important indicator of severe weather which can be used during weather warning operations to augment radar information. Also shown are imagery from the Jarrell, Texas tornado outbreak. Of particular interest with this case, is the 1km IR AVHRR data which was available for an interesting comparison with GOES.

References/Additional Links


  • IR enhancement examples that are useful to detect Enhanced-V cloud top signatures
  • McCann, D.W., 1983: The enhanced-V, a satellite observable severe storm signature. Mon. Wea. Rev., 111, 887-894.
  • McCann, D.W., 1983: The enhanced-V, a satellite observable severe storm signature. IN: NWA Meteorological Monograph 2-86 “Satellite Imagery Interpetation for Forecasters”, Wash., DC., May 1993. Vol. 2, pp. 4-I-1 – 4-I-8.
  • McCann, D.W., 1981: The enhanced-V, a satellite observable severe storm signature. IN:United States National Oceanic and Atmospheric Administration, National Weather Service, Wash., DC., Technical Memorandum (NOAA TM NWS NSSFC-4), March 1981. 31 p., 33, 5-257.
  • Heymsfield, G.M., Blackmer, R., Jr., and Schotz, S., 1983: Upper level structure of Oklahoma tornadic storms on 2 May 1979, Pt. 1 Radar and Satellite observations. Journal of the Atmospheric Sciences, Boston, 40(7): 1740-1755.
  • Heymsfield, 1983: Upper level structure of Oklahoma tornadic storms on 2 May 1979, Pt. 2, Proposed explanation of V pattern and internal warm region in infrared observations, Journal of the Atmospheric Sciences, Boston, 40(7): 1756-1767.
This course is Basic

Prior to attending this session on the enhanced-V satellite signature, you should review the following materials:

  • Adler, R.F., M.J. Markus, D.D. Fenn, G. Szejwach, and W.E. Shenk, 1983: Thunderstorm top structure observed by aircraft overflights with an infrared radiometer. J. Climate and Appl. Meteor., 22, 579-593.
  • McCann, D.W., 1983: The enhanced-V, a satellite observable severe storm signature. Mon. Wea. Rev., 111, 887-894.
  • McCann, D.W., 1983: The enhanced-V, a satellite observable severe storm signature. IN: NWA Meteorological Monograph 2-86 “Satellite Imagery Interpetation for Forecasters”, Wash., DC., May 1993. Vol. 2, pp. 4-I-1 – 4-I-8.
  • Heymsfield, G.M., Blackmer, R., Jr., and Schotz, S., 1983: Upper level structure of Oklahoma tornadic storms on 2 May 1979, Pt. 1 Radar and Satellite observations. Journal of the Atmospheric Sciences, Boston, 40(7): 1740-1755.
  • Heymsfield, 1983: Upper level structure of Oklahoma tornadic storms on 2 May 1979, Pt. 2, Proposed explanation of V pattern and internal warm region in infrared observations, Journal of the Atmospheric Sciences, Boston, 40(7): 1756-1767.
  • McCann, D.W., 1981: The enhanced-V, a satellite observable severe storm signature. IN:United States National Oceanic and Atmospheric Administration, National Weather Service, Wash., DC., Technical Memorandum (NOAA TM NWS NSSFC-4), March 1981. 31 p., 33, 5-257.

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