Public Information Statement
Issued by NWS Upton, NY

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NOUS41 KOKX 011054

Public Information Statement
National Weather Service New York NY
654 AM EDT Wed Nov 1 2017


Please join the National Weather Service and the New York State
Office of Emergency Management in promoting winter weather education
including safety.

The topic for today is ice storms.

Freezing rain is liquid rain that falls when surface temperatures
are at or below 32 degrees Fahrenheit. The rain freezes upon impact
with objects and the ground, creating a layer of ice. When the layer
of ice accumulates to at least one half inch thick, the weight of
the ice can down tree limbs, power lines and communication towers,
and cause widespread impacts. This defines an ice storm.

Even just a trace of freezing rain can produce a thin layer of ice
on roads, which can cause significant impact to mass transit,
especially if it occurs during rush hour.

Although ice storms occur more frequently from northern New Jersey
across the Lower Hudson Valley and interior southwest
Connecticut, they can occur along the coast.

On January 18th 2015, up to one quarter of an inch of ice fell
across the area. This was a result of a retreating high pressure
system to the north locking in a shallow layer of cold air, while a
warm front approached from the south. Even as air temperatures rose
above freezing, very cold ground temperatures still allowed rain to
freeze on contact with roads and walkways. Ice covered roads led to
hundreds of traffic accidents.

On February 1st and 2nd of 2011, between one quarter and three
quarters of an inch of ice fell across Long Island, the New York
City and New Jersey metro area, southern portions of the Lower
Hudson valley and southern Connecticut. Several roof collapses were
caused by the weight of the ice on top of already snow covered
roofs, while many tree limbs and power lines were downed, causing
numerous power outages. Ice covered roads also led to numerous
traffic accidents.

The next statement around 6 am Thursday will cover winter floods.

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