Lake effect thunder snows over the eastern great lakes
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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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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%

Lake Effect Storms Over the Eastern Great Lakes

Surprisingly Efficient in Producing Lightning


NLDN

Make Up of Data Set…

Use of Spotter Reports from Dense Snow Spotter Network


10 Years

130

Events


+ + + + + +

+ + + + + +

- - - - - -

- - - - -

+ + + + + + +

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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


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


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


On Average…Lake Induced

EL 37% higher for TSSN events

Height of the Lake Induced Equilibrium Level


Lake Induced CAPE


Open Water Lake Temperature


Long Fetch Across the

Axis of the Lake


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


Houston Environmental Aerosol Thunderstorm (HEAT)

Project….2005 Update (Richard Orville, et al)


Project EAGLLES

“Eastern Great Lakes Lake Effect Snow”

Headed up by Hobart and William Smith College

and the University of Illinois


Likely

Not

Expected

Chance

Lightning

Non-Lightning

(Ft)


Questions….


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