- Heavy lake-effect snow will continue to hammer the Great Lakes snowbelts into this weekend.
- The most intense snowbands are impacting areas downwind of lakes Erie and Ontario, including Buffalo.
- Multiple feet of snow are likely to have severe impacts on travel in these snowbelts.
- This could be one of Buffalo’s heaviest snowstorms on record.
Heavy lake-effect snow will continue to hammer the Great Lakes snowbelts today, including the Buffalo metro area where snow totals measured in feet could potentially make this a historic storm.
An intense band of lake-effect snow that developed on Lake Erie Thursday night continues to pummel areas near and south of Buffalo this morning.
Snowfall rates of two to three inches per hour and thundersnow have been observed in this band for many hours.
Up to 22.5 inches of snow has piled up in Hamburg, New York, which is located just south of downtown Buffalo. The Buffalo International Airport has seen up to 12.5 inches of snowfall.
Farther north, the top total from a band that developed off of Lake Ontario yesterday has produced up to two feet of snowfall near Williamstown, New York.
(MAP: Interactive Radar)
Lake-effect snow warnings are in effect east and southeast of lakes Erie and Ontario in western and upstate New York, northwest Pennsylvania and far northeast Ohio. Those warnings include Buffalo and Watertown, New York, and Erie, Pennsylvania.
Winter storm warnings and winter weather advisories are posted elsewhere in the lake snowbelts, including in western Lower Michigan, western Upper Michigan and extreme northern Wisconsin.
Major to extreme impacts are expected in some of the areas under warnings, according to NOAA’s Winter Storm Severity Index.
In the Lake Erie snowbelt, a single, intense band of snow along almost the entire length of the lake will continue to impact the Buffalo metro area through Friday night. Snowfall rates in this band will be up to three inches per hour and might be accompanied by thundersnow at times.
Saturday will begin with the heavy snowband impacting areas from near Buffalo northward to Niagara Falls. The band should weaken some as it shifts northward, providing a break for the Buffalo metro area by sometime Saturday afternoon. A cold front will move through Saturday night into early Sunday, pushing that band south again over Buffalo before it finally fizzles.
Elsewhere, another intense band of snow is expected to reform off Lake Ontario near Watertown Friday through the weekend before ending.
How Much Snow
Snowfall totals in multiple feet are expected in the Buffalo metro area, as well as along parts of the Interstate 81 corridor of upstate New York and the Tug Hill Plateau from this multi-day pummeling. Locally up to 4 feet of snow could fall in portions of the Buffalo metro area.
Keep in mind the map below shows the forecast for additional snow on top of what has already fallen.
At least 6 inches of additional lake-effect snow is also likely along the I-90 corridor in northwest Pennsylvania, over much of western Lower Michigan and the Lake Superior snowbelts of Michigan’s Upper Peninsula and far northern Wisconsin.
Travel will be treacherous, if not impossible, at times, along these stretches with whiteout conditions within the heaviest snowbands.
Buffalo, New York, is one of the snowiest larger cities in America. Just over 95 inches of snow is measured in Buffalo each year, on average.
This snowstorm has the potential to dump 25 to 50 percent of the city’s average annual snow in just a few days’ time.
Acording to NOAA’s historical database, Buffalo’s all-time 1-day snowfall record was 33.9 inches on Dec. 10, 1995. Its 2-, 3-, and 4-day snowstorm records were from a late December 2001 snowstorm. These measurements were taken at Buffalo-Niagara International Airport, located northeast of downtown. Buffalo’s southern suburbs, or Southtowns, often see the heaviest snow amounts in a lake-effect snowstorm.
Eight years ago, Buffalo and western New York were also hammered by a prolific, multi-day, lake-effect snowstorm.
Up to 88 inches of snow buried the Buffalo Southtowns, a record for the region.
A 132-mile long section of the New York State Thruway (Interstate 90) was shut down for several days.
“There were 14 fatalities with this storm, hundreds of major roof collapses and structural failures, thousands of stranded motorists and scattered food and gas shortages due to impassable roads,” the National Weather Service in Buffalo wrote in a post storm summary.
In 2000two feet of snow in the days leading up to Thanksgiving trapped thousands on roads, in schools or businesses in what was considered the most disruptive storm in the Buffalo metro since the infamous Blizzard of 1977, according to the National Weather Service.
It’s not certain this event will be a repeat of either of these major storms. But it does have that potential.
Do not travel in these areas during the height of the storm. If you absolutely must travel, let others know about your plans and carry a winter survival kit in your vehicle in case you become stranded.
Why Such A Heavy Lake-Effect Storm?
A sharp southward plunge of the jet stream will remain in place from eastern Canada through the Midwest and Northeast. This will keep a pipeline of cold air wide open from Canada across the Great Lakes.
That cold air will flow over the much warmer water of the Great Lakes. This contrast of cold air over warmer lake water will generate bands of lake-effect snow along the downwind shores of the lakes, known as the Great Lakes snowbelts, from western and Upper Michigan to northern Indiana, northeast Ohio, northwest Pennsylvania and in western and upstate New York.
This is a common pattern that usually sets up in late fall and early winter.
But there are reasons why this will be a more prolific snow event in some places.
First, the Great Lakes are very warm for mid-November, due in large part to one of the warmest starts to November on record. Lake Ontario is the warmest it’s been for mid-November in at least 27 years, according to an analysis from NOAA shown below. Lake Erie is at its second warmest for mid-November since the mid-1990s.
The warmer the water, the more unstable the air is when coupled with the cold air flowing over it. Air can then rise faster into the clouds and generate snowfall more efficiently.
Instability in this case could be so extreme it may manufacture heavy snowbands accompanied with thunder and lightning, at times, producing several inches per hour snowfall rates.
Secondly, winds are expected to line up along the longest axis of both lakes Erie and Ontario.
When this happens, lake-effect snow takes the form of one solid, 100-plus-mile long band of heavy snow as opposed to multiple bands of lighter snow.
Finally, this event will last for several days. That means if the single, long band of heavy snow stalls over a given area, several feet of snow is likely to pile up.
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