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Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005

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. Meteorological Environment Key Points. Warm and moist low level air

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Large-Hail-Producing Thunderstorms over the Midlands of South Carolina on October 21, 2005

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  1. Large-Hail-Producing Thunderstorms over the Midlands of South Carolinaon October 21, 2005 Dan MillerNWS Columbia, SC

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

  3. 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

  4. Jet Streak250mb Height/Wind Speed18Z 21-Oct-05

  5. Jet Streak250mb Height/Wind Speed00Z 22-Oct-05

  6. Upper Impulse500mb Heights/Vorticity/Temps18Z 21-Oct-05

  7. Upper Impulse500mb Heights/Vorticity/Temps00Z 22-Oct-05

  8. Surface Analysis12Z 21-Oct-2005

  9. LAPS Sounding Clarendon Co. 18Z

  10. Clarendon County Severe Cell

  11. Thank You! Dan Miller National Weather Service 2909 Aviation Way West Columbia, SC 29170 daniel.miller@noaa.gov 803-822-8133

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