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Lake Effect Thunder-Snows Over the Eastern Great Lakes

Lake Effect Thunder-Snows Over the Eastern Great Lakes. Robert Hamilton NWS Buffalo, NY Scott Steiger, Ph D SUNY Oswego, NY. Less than 1/10 of 1% of snowfall in the continental United States is accompanied by thunder and lightning. Curran and Pearson 1971. 20%. 80%.

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Lake Effect Thunder-Snows Over the Eastern Great Lakes

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  1. Lake Effect Thunder-Snows Over the Eastern Great Lakes Robert Hamilton NWS Buffalo, NY Scott Steiger, Ph D SUNY Oswego, NY

  2. Less than 1/10 of 1% of snowfall in the continental United States is accompanied by thunder and lightning. Curran and Pearson 1971

  3. 20% 80% Lake Effect Storms Over the Eastern Great Lakes Surprisingly Efficient in Producing Lightning

  4. NLDN Make Up of Data Set… Use of Spotter Reports from Dense Snow Spotter Network

  5. 10 Years 130 Events

  6. + + + + + + + + + + + + - - - - - - - - - - - + + + + + + + + + + + + + + + + Ice particles -40 C -20 C Supercooled droplets start To Nucleate around -10c -10 C Graupel Forms Through Riming 0 C Droplets form by Condensation in Updraft

  7. Parameters Affecting Lake Effect Thundersnow • Height of -10C .53 X • Lake Surface Temp .48 X • Height of Lake Induced EL .45 X • Lake Induced CAPE .28 X • Fetch (Lk Erie) .46 X • Shear…Band Type .93 X Correlation Coefficient (r) t test significance

  8. Height of -10C Birch Dove Parameters Affecting Lake Effect Thundersnow …Moderate Correlation …84% Difference Between Ltg and Non-Ltg Events …Supported by Previous Studies by Schultz, Moore and Michimoto

  9. On Average…Lake Induced EL 37% higher for TSSN events Height of the Lake Induced Equilibrium Level

  10. Lake Induced CAPE

  11. Open Water Lake Temperature

  12. Long Fetch Across the Axis of the Lake

  13. + + + + + + + + + + + + + + - + + + + - - - - - - - - - - - - - - - - - - Finally….is the presence of lightning aided by close proximity charge concentrations between clouds?

  14. Houston Environmental Aerosol Thunderstorm (HEAT) Project….2005 Update (Richard Orville, et al)

  15. Project EAGLLES “Eastern Great Lakes Lake Effect Snow” Headed up by Hobart and William Smith College and the University of Illinois

  16. Likely Not Expected Chance Lightning Non-Lightning (Ft)

  17. Questions….

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