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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

Lake Effect Thunder-Snows Over the Eastern Great Lakes

Robert Hamilton

NWS Buffalo, NY

Scott Steiger, Ph D

SUNY Oswego, NY

slide2

Less than 1/10 of 1% of snowfall in the continental

United States is accompanied by thunder and lightning.

Curran and Pearson 1971

slide3

20%

80%

Lake Effect Storms Over the Eastern Great Lakes

Surprisingly Efficient in Producing Lightning

make up of data set

NLDN

Make Up of Data Set…

Use of Spotter Reports from Dense Snow Spotter Network

slide5

10 Years

130

Events

slide6

+ + + + + +

+ + + + + +

- - - - - -

- - - - -

+ + + + + + +

+ + + +

+ + + + +

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
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

parameters affecting lake effect thundersnow8

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

slide14

Long Fetch Across the

Axis of the Lake

slide15

+

+

+

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+

+

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

slide16

Houston Environmental Aerosol Thunderstorm (HEAT)

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

slide17

Project EAGLLES

“Eastern Great Lakes Lake Effect Snow”

Headed up by Hobart and William Smith College

and the University of Illinois

slide18

Likely

Not

Expected

Chance

Lightning

Non-Lightning

(Ft)