National Weather Service United States Department of Commerce

Series of Storm Systems To Impact The West Coast This Week

A series of Pacific weather systems will bring several rounds of precipitation and wind to the western U.S. this week. Several inches of rain could fall in portions of WA, OR and CA, especially in the coastal ranges and foothills. Snow is forecast in the higher mountains. In addition, winds will be strong, especially in mountainous areas, which could pose a hazard to high-profile vehicles. Read More >

Lake Effect Summary - December 18-19, 2013 

Lake Effect Snowfall - December 18-19, 2013


Maximum Snowfall: Lake Erie 12" (West Falls); Lake Ontario 11.2" (Highmarket)

Duration: 24 hours +/-

Prime feature: Hybrid synoptic 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 Lakes.  

While 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