The 11 June 2008 Severe Pulse Storm over Newberry SC
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Transcript of The 11 June 2008 Severe Pulse Storm over Newberry SC
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The 11 June 2008 Severe Pulse Storm over Newberry SC
Michael W. Cammarata (NWS CAE)
Jamie Christopher (former Student Volunteer, NWS CAE)
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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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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
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2123Z
*Note - Small reflectivity core
develops above -20C (red line).
Max 44dbz
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2127Z
*Note – Reflectivity core
strengthens above -20C line.
Max 54dbz
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*Note – Reflectivity core
increases in coverage.
Max 64dbz
2131Z
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*Note – Reflectivity core lowers in height
and higher reflectivity is seen.
Max 69dbz
Good indication that hail has increased in
size.
2135Z
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*Note – Reflectivity core lowers below the 0C level (yellow line).
Max 66dbz
Updraft is weakening
and hail size is decreasing
as melting occurs.
2140Z
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*Note – Core continues to lower
as storm continues to
collapse.
2144Z
Sfc temp = 92F
Significant melting of
hailstones is occurring as sfc
temp is very warm.
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*Note – Main core continues to
weaken.
Heavy rain is more of a
possibility at this point.
2148Z
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*Note – Storm has almost fully collapsed.
Heavy rain is still a
possibility.
2152Z
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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