National Weather Service United States Department of Commerce

Winter Weather Awareness Week

Winter Weather Awareness Week for New York is from October 29 through November 2, 2018.

Please join us in promoting winter weather safety during this year's "Winter Weather Awareness Week". The National Weather Service asks emergency management, public safety officials, local media and Weather-Ready Nation Ambassadors to help join forces in improving the nation's readiness, responsiveness, and overall resilience against extreme weather during the winter weather season.

Each day this week, a different topic will be covered. Click on the tabs below for more winter weather preparedness information.

Monday

Preparedness

We will explore what precautions you can take to mitigate against New York's harsh winters and how you can become ready and more resilient.

It has been proven that the best way to prepare for extreme weather is to have a plan.  Never let a winter storm take you by  surprise.  If you are expecting to be at home or at work during an extreme winter weather event, you need to be concerned about losing power, heat, or cell / phone service. Losing one of these 
three services may create a life threatening situation. Make sure you have a back up plan.

Home Winter Preparedness

Whether you are at home, on the road or at work, one should always have an emergency kit. An emergency kit should include the following: a flashlight and extra batteries, a battery-powered NOAA Weather Radio, food and water, extra prescriptions, an emergency heat source, first-aid supplies and a cell phone or another way to communicate such as a CB radio or amateur radio unit.  

The best action to take during a winter storm is to stay inside and not travel, unless it is an emergency. 

Getting traction

Car Winter Survival Kit Checklist

If you must drive, slow down and allow extra time to reach your destination! Let someone know where you are going and what route you are going to take. If your car gets stuck in a storm, stay in your vehicle! If you leave your vehicle, you could become disoriented quickly if there is wind-driven snow and cold. Run the motor for a total of 10 minutes each hour for heat. While running the motor, open the window a little bit so that fresh air can get into the car to avoid carbon monoxide poisoning. Make sure you clear snow away from the exhaust pipe to avoid gas poisoning. Attach a bright cloth to your car door to draw attention to yourself, and when it stops snowing, raise the hood of your car to indicate to others you need help.

Cold Safety Don't forget your pets
Shovel smart Dressing for Cold Weather
Warning signs of hypothermia

 

Tuesday

Lake Effect Snow

Lake effect snow is a common weather phenomena in the Great Lakes region. Lake effect snow develops mainly in northern, central and western New York during the late fall and winter months.  When cold, Canadian air moves over Lakes Ontario and Erie, the relatively warm and moist air from the lakes rise quickly, condenses, and forms lake effect snow. 

The direction of the wind is the most important factor of who willsee the lake effect snow. Heavy snow could be falling at one location, while the sun may be shining just a mile or two away in either direction. The geography of the land and water is very important. That is why the Tug Hill Plateau in upstate New York is a great example of how topography plays a role in lake effect snow development. The Tug Hill Plateau typically sees over 200 inches of snow per year.

 

Lake Effect Snow

 

Lake effect snow develops in two primary ways: in the form of a "single band" and "multi-bands" which are dependent on the direction of the wind. When the wind flows horizontally from the west and southwest across Lakes Ontario and Erie, a single lake effect snow band forms. These bands can produce several feet of snow within a  short period of time. From November 17th to 19th, 2014, up to 7 feet of snow fell downwind of Lake Erie just south of Buffalo. From November 19-22th, 2016 persist northwest winds off Lake Ontario led to multiple lake effect snow bands that dumped between 2 and 3 feet of snow across the eastern Finger Lakes to the Binghamton area in the southern tier of New York.

 

 

From November 17th to 19th, 2014, up to 7 feet of snow fell downwind of Lake Erie just south of Buffalo.

 

WFO BUF snowfall analysis

Courtesy National Weather Service Buffalo, NY

 

 

Snow squalls are intense short-lived bands of very heavy snow that often form along arctic fronts. Snow squalls produce blizzard-like or white-out conditions that typically last less than 30 minutes. They produce rapid snowfall accumulations, rapid drop in visibility and flash freeze conditions on our roads. This makes snow squalls very dangerous to motorists. Nationwide, snow squalls can claim hundreds of lives each winter. 

Graphical information slide. Click for a larger view.

 

Snow squall

 

Take extreme caution while driving through both lake effect snow and snow squalls. Heavy snowfall in general creates very low visibilities. Lake effect snow and snow squalls can be narrow and intense with visibilities dropping quickly to less than a hundred feet without warning. Lake effect snow and snow squalls often have snowfall rates over 2-3 inches per hour. This leads to very hazardous driving conditions. If all possible, do not drive through intense lake effect snow or snow squalls.  

 

Wednesday

Nor'easters and Other Winter Storms

Over the past few winters, powerful snowstorms developed along the east coast and paralyzed cities across much of the northeast. These winter storms disrupted hundreds of thousands of lives ranging from loss of power to transportation difficulties. 

Large accumulations of snow can be produced by Nor'easters. Smaller more common snowfall events are often generated by systems called Alberta clippers.

Nor'easters are intense low pressure systems that track along the eastern seaboard. Its name comes from mariners that experienced the strong northeast winds associated with these storms, but inland they are known for their heavy snow and at times blizzard conditions. Some memorable Nor'easters in recent years include the President's day Snowstorm of 2003, the Valentine's Day Snowstorm of 2007, and the Blizzard of 2017 which occurred recently. Snowfall rates in a Nor'easter can reach up to 3 to 6 inches per hour which can last for several hours.

Water vapor loop.

Water vapor loop of the March 14, 2017 Nor'easter. Courtesy NWS New York.

 

Radar loop of the March 14, 2017 Nor'easter.

 

Courtesy of Ron Murphy

 

Snowfall for Match 14, 2017

 

Alberta clippers are common to our region bringing a quick round of snow. Alberta clippers are low pressure systems that develop in or near the providence of Alberta, Canada. Alberta clippers move southeast very quickly and typically bring a few to several inches of snow. Their quick movement limits the snow amounts. 

Alberta Clipper


Graphical information slide. Click for a larger view.

Ice Storms Ice Storms Types of Winter Precipitation
Clipper Noreaster Noreaster

 

 

Thursday

Flooding and Ice Jams

One of our deadliest winter weather hazards is flooding. 

In the state of New York one usually associates snow, ice, and bitter cold with winter. But sometimes nature throws a curve at us with unseasonably warm temperatures, and heavy rain. 

Ice JamA number of different factors work together to produce floods in winter. When unseasonable warmth comes to the region it will often melt much, if not all of the snow on the ground especially in the lower elevations. The melting snow can saturate the ground and also swell the rivers. If the combination of unseasonably warm temperatures, heavy rain, and snow melt occurs, rivers may rise above their banks producing floods.

Some of our worst winter floods are created by an intense low pressure system that tracks from the Ohio valley northeast, down the Saint Lawrence Valley in Canada. These storms bring a lot of warm and moist air into the region from the Gulf of Mexico and the Atlantic.

Flooding during the winter months can also be caused by ice jams. When river flows increase, water levels rise. Ice is less dense than water, thus ice floats. When enough pressure is applied by the river below, the ice will break. Ice typically breaks into slabs and floats downstream. When the ice interacts with an obstruction such as a bridge, bend in the river, island, or a wide shallow area, the ice will often pile up into an ice jam. The ice jam then prevents water from freely flowing, and forces the water to rise, creating a flood. Ice jams can form any time during the winter season.

Flooding on roads and poor drainage areas can also occur when mounds of plowed snow and ice block grates and storm drains. Standing water can cause dangerous black ice if it freezes. 

Frozen Susquehanna river

 

Friday

National Weather Service Winter Products

This will provide you with some terms the National Weather Service uses to describe winter weather as well as the definitions of watches, warnings, and advisories issued for winter weather events.

Watches are issued when a storm is in it's early stage of development, and may create conditions that may harm life and property. Hazardous winter weather is only a possibility, not a certainty. 

The following are the watch headlines issued for winter weather events: 

  • Winter Storm Watch is issued when heavy snow, damaging ice accumulations, heavy lake effect snow, or blizzard conditions are possible. Winter storm watches are typically issued 36 to 72 hours before a winter storm starts. 
  • Wind Chill Watch is issued when dangerously cold wind chills are possible typically in the next 36 to 72 hours. 

 

Warnings are issued when the threat to life and property is imminent or has already begun from severe winter weather.

The following are the warning headlines issued for winter weather events:

  • Winter Storm Warning is issued when hazardous winter weather in the form of heavy snow, freezing rain, sleet or any combination there of, is imminent or occurring. Winter storm warnings are typically issued 12 to 36 hours before the event is expected to start.
  • Ice Storm Warning is issued when damaging ice accumulations are expected within the next 12 to 36 hours.
  • Blizzard Warning is issued when sustained or gusty winds of 35 mph or more prevail, combined with falling or blowing snow, reduce visibilities of one quarter of a mile or less, and last for at least 3 hours.
  • Snow Squall Warning is issued when a band of very heavy snow is expected to produce snowfall above 2 inches per hour, visibilities less than 1/4 mile for between 15 and 30 minutes.  The snow squall could be accompanied by gusty winds, blowing snow and a flash freeze on roads. Snow squall warnings have been expanded to include the enitre state of New York for the upcoming winter. 
  • Wind Chill Warning is issued when the combination of extreme cold and winds occur. This combination will result in frostbite, hypothermia, or even death when exposed in this type of condition for an extended period of time.

 

Advisories are issued for less serious weather conditions that will not cause immediate threat to life and property. Advisories will be issued when weather conditions will impact motorists, outdoor activities, or public events. These events could become life-threatening if proper precautions are not taken.

The following are the advisory headlines issued for winter weather events:

  • Winter Weather Advisory is issued for accumulations of snow, lake effect snow, freezing rain, freezing drizzle, or sleet, that will create inconveniences. During an advisory, if caution is not exercised, life and property may be threatened.
  • Wind Chill Advisory is issued when wind chill temperatures create inconvenience to life with prolonged exposure. If caution is not exercised, hypothermia and frostbite may occur. 

 

Graphical information slide. Click for a larger view.

Winter safety Winter storm products

 

 

All info graphics in a PDF.

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You can also contact:

Dave Nicosia (david.nicosia@noaa.gov) for additional information about NOAA's 2018 National Weather Service Winter Weather Awareness Week.