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Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

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Page 1: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Large-Hail-Producing Thunderstorms over the Midlands of South Carolina

on October 21, 2005

Dan MillerNWS Columbia, SC

Page 2: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

SC 25-Year Large Hail (1.75”+) Climatology

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J F M A M J J A S O N D

SC Hail Events(1.75"+) since 1980

Page 3: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Meteorological EnvironmentKey Points

• Warm and moist low level air – Surface temperatures and dewpoints about ten

degrees above normal, enhancing instability.• Dry air aloft

– Seen on water vapor imagery and soundings, aiding parcel buoyancy and lowering wet bulb zero height.

• Upper level disturbance– PVA enhancing lift, and cooling temps aloft

steepening lapse rates/instability.• Jet streak

– Left front quadrant enhancing divergence aloft/lift• Low level convergence/boundaries

– source of lift

Page 4: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Jet Streak250mb Height/Wind Speed

18Z 21-Oct-05

Page 5: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Jet Streak250mb Height/Wind Speed

00Z 22-Oct-05

Page 6: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Upper Impulse500mb Heights/Vorticity/Temps

18Z 21-Oct-05

Page 7: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Upper Impulse500mb Heights/Vorticity/Temps

00Z 22-Oct-05

Page 8: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 9: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Surface Analysis12Z 21-Oct-2005

Page 10: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 11: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 12: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

LAPS Sounding Clarendon Co. 18Z

Page 13: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 14: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 15: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Clarendon County Severe Cell

Page 16: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 17: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 18: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 19: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 20: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 21: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC
Page 22: Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005 Dan Miller NWS Columbia, SC

Thank You!

Dan MillerNational Weather Service2909 Aviation WayWest Columbia, SC 29170

[email protected]


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