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By Rob Cox (NWS Cheyenne)

By Rob Cox (NWS Cheyenne) . Colorado Lightning Mapping Array depicts a Lightning Jump Prior to a Non- Supercell Tornado 5 to 10 miles northwest of Cheyenne. July 29, 2013 @ ~6pm. Photo Courtesy Steve Apfel. Tornado ~5 to 10 miles Northwest of Cheyenne.

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By Rob Cox (NWS Cheyenne)

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  1. By Rob Cox (NWS Cheyenne) Colorado Lightning Mapping Array depicts a Lightning Jump Prior to a Non-Supercell Tornado 5 to 10 miles northwest of Cheyenne

  2. July 29, 2013 @ ~6pm Photo Courtesy Steve Apfel

  3. Tornado ~5 to 10 miles Northwest of Cheyenne

  4. 0.5 deg. Z ~15 min prior to Tornado MIC Home

  5. 0.5 deg V. ~15 min Prior to Tornado MIC Home

  6. 0 to 3km LAPS Sfc. Based Lapse Rates (23Z)

  7. 0 to 3 km LAPS Surface Based Capes (23Z)

  8. 6.4 deg Z. at ~ Time of Tornado (00:05Z) MIC Home

  9. 6.4 SRM Slice at ~ time of Tornado (00:05Z) MIC Home

  10. COLMA 2349Z-00:05Z

  11. Summary • Look for Pre-Existing Convergent Surface Boundaries • 0-3km Capes Greater than 40 j/kg • Steep Low level Lapse Rates • High Reflectivity's Aloft • Mid level Rotation • Lightning Jump ~10 to 15 min prior to Tornado Development

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