Public Information Statement
Issued by NWS Binghamton, NY

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Public Information Statement
National Weather Service Binghamton NY
800 AM EST Thu Nov 10 2016

...THIS WEEK IS THE 2016 NOAA`S WINTER WEATHER AWARENESS WEEK FOR

THE STATE OF PENNSYLVANIA...

The National Weather Service will feature a different educational
topic each day. Today`s topic is 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 unseasonable warm temperatures, and
with it, rain.

A 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 in the lower
elevations. The melting snow will saturate the ground and also
begin to swell the rivers. If the combination of unseasonable warm
temperatures, heavy rain, and snow melt occurs, rivers may
then rise above their banks producing floods.

Some of our worst winter floods are created by an intense cyclone
that tracks from the Ohio valley, towards northeast, up the
Saint Lawrence Valley into 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 generated 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 bend, 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.

The following topics will be covered this week:
Friday: National Weather Service Winter Products.

Additional information will be disseminated by social media
platforms: Facebook at, http://www.facebook.com/nwsbinghamton and
Twitter at, http://www.twitter.com/nwsbinghamton.

Please join us by using the following hashtags:
#Winterprep, #Winter, and #AreYouReady.

For additional information on New York Winter Weather
Awareness Week:

http://weather.gov/bgm/wwaw

You can also contact Dave Nicosia at, david.nicosia@noaa.gov, or
Kat Hawley at, katherine.hawley@noaa.gov, for additional information
about NOAA`s 2016 National Weather Service Winter Weather
Awareness Week.

$$

KAH


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