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The 11 June 2008 Severe Pulse Storm over Newberry SC

The 11 June 2008 Severe Pulse Storm over Newberry SC. Michael W. Cammarata (NWS CAE) Jamie Christopher (former Student Volunteer, NWS CAE). Overview. During the late afernoon of 11 June 2008 a severe pulse thunderstorm produced 0.88 inch hail over Newberry SC.

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The 11 June 2008 Severe Pulse Storm over Newberry SC

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  1. The 11 June 2008 Severe Pulse Storm over Newberry SC Michael W. Cammarata (NWS CAE) Jamie Christopher (former Student Volunteer, NWS CAE)

  2. Overview • During the late afernoon of 11 June 2008 a severe pulse thunderstorm produced 0.88 inch hail over Newberry SC

  3. NAM 16h forecast sounding valid at 2200 GMT shows moderate to strong instability, weak shear, and wet bulb zero temperatures favorable for large hail…also note dry layer 12-22k ft…evaporative cooling can lower freezing level increasing large hail potential

  4. 2123Z *Note - Small reflectivity core develops above -20C (red line). Max 44dbz

  5. 2127Z *Note – Reflectivity core strengthens above -20C line. Max 54dbz

  6. 2131Z *Note – Reflectivity core increases in coverage. Max 64dbz

  7. 2135Z *Note – Reflectivity core lowers in height and higher reflectivity is seen. Max 69dbz Good indication that hail has increased in size.

  8. 2140Z *Note – Reflectivity core lowers below the 0C level (yellow line). Updraft is weakening and hail size is decreasing as melting occurs. Max 66dbz

  9. 2144Z *Note – Core continues to lower as storm continues to collapse. Significant melting of hailstones is occurring as sfc temp is very warm. Sfc temp = 92F

  10. 2148Z *Note – Main core continues to weaken. Heavy rain is more of a possibility at this point.

  11. 2152Z *Note – Storm has almost fully collapsed. Heavy rain is still a possibility.

  12. Conclusion • 3-D analysis of radar data makes it easy to visualize the delopment of high reflectivity cores aloft early in the storm life cycle. • Can lead to increased lead times in pulse events

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