Lake Effect Summary - December 18-19, 2013
Maximum Snowfall: Lake Erie 12" (West Falls); Lake Ontario 11.2"
Duration: 24 hours +/-
and lake effect.
The fourth lake effect event of the season was a
combination of light synoptic snows, followed by some lake effect snows. A shortwave rode
through a long wave trough over the eastern United States, and this shortwave brought several inches
of snow across Western and North Central New York. Behind this shortwave, temperatures at 850 hpa
dropped down to about -12C, which created enough instability over a cold, but not frozen lake
surface to generate lake effect snow. Snow fell through the morning and afternoon hours off Lake
Erie, before migrating northward through the evening hours and dissipated under weakening lake
effect snow parameters and warm air advection. The lake effect band of snow off Lake Ontario
intensified through the late morning and afternoon hours while impacting the Tug Hill region. This
band too also shifted northward overnight and weakened.
Snowfall rates off Lake Erie peaked at an inch per hour, while off Lake Ontario
snowfall rates peaked at 2 inches per hour. Within the higher snowfall rates off Lake Ontario
thunder snow occurred late Wednesday afternoon. Given the weak lake instability, this event
produced manageable snows with upwards of a foot of snow falling east of both Eastern Great
snows were light, gusty winds and the timing of early morning off Lake Erie did bring accidents on
area roads slowing the morning commute.
Off Lake Erie...
12 inches... West Falls
11 inches... Boston
9.6 inches... Dunkirk
Off Lake Ontario...
11.8 inches... Highmarket
10.8 inches... Lacona
8 inches... Constableville
6.0 inches... Glenfield