Ice Storm Warning
Encyclopedia
An Ice Storm
Ice storm
An ice storm is a type of winter storm characterized by freezing rain, also known as a glaze event or in some parts of the United States as a silver thaw. The U.S. National Weather Service defines an ice storm as a storm which results in the accumulation of at least of ice on exposed surfaces...

 Warning
is issued by the National Weather Service
National Weather Service
The National Weather Service , once known as the Weather Bureau, is one of the six scientific agencies that make up the National Oceanic and Atmospheric Administration of the United States government...

 of the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 when freezing rain
Freezing rain
Freezing rain is the name given to rain that falls when surface temperatures are below freezing. The raindrops become supercooled while passing through a sub-freezing layer of air, many hundred feet , just above the surface, and then freeze upon impact with any object they encounter. The resulting...

 produces a significant and possibly damaging accumulation of ice
Ice
Ice is water frozen into the solid state. Usually ice is the phase known as ice Ih, which is the most abundant of the varying solid phases on the Earth's surface. It can appear transparent or opaque bluish-white color, depending on the presence of impurities or air inclusions...

. The criteria for this warning vary from state to state, but typically an ice storm warning will be issued any time more than ¼ inch (6 mm) of ice is expected to accumulate in an area; in some areas, the criterion is ½ inch (13 mm). A freezing rain advisory
Freezing rain advisory
A Freezing Rain Advisory is an advisory issued by the National Weather Service in the United States when freezing rain or freezing drizzle is expected to cause significant inconveniences, but does not meet warning criteria .-Example: Freezing Rain AdvisoryURGENT - WINTER WEATHER...

or freezing drizzle advisory will be issued when a small amount of icing is possible.

In Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

, a Freezing Rain Warning has the same meaning.

Example of an ice storm warning


URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SPRINGFIELD MO
945 PM CST SUN DEC 9 2007

...CONDITIONS RAPIDLY DETERIORATING WEST OF HIGHWAY 65 THIS
EVENING...

.THE NEXT WAVE OF PRECIPITATION IS NOW SPREADING INTO SOUTHWEST
MISSOURI. AT 930 PM...RADAR INDICATED LIGHT TO MODERATE
PRECIPITATION EXTENDING FROM OSCEOLA IN ST. CLAIR COUNTY TO
NEOSHO IN NEWTON COUNTY. THIS BAND OF PRECIPITATION ALSO LIKELY
CONTAINS EMBEDDED THUNDERSTORMS PRODUCING HEAVY PRECIPITATION.
OTHER SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS
WERE ALSO DEVELOPING ACROSS EAST CENTRAL OKLAHOMA AND SPREADING
NORTHEAST TOWARDS SOUTH CENTRAL MISSOURI. MEANWHILE...THE FREEZING
LINE CONTINUES TO SLOWLY PUSH SOUTHEAST THIS EVENING. AT 9
PM...THE FREEZING LINE EXTENDED FROM BRANSON TO AVA IN DOUGLAS
COUNTY TO JUST SOUTH OF SALEM IN DENT COUNTY. THE FREEZING LINE
WILL NUDGE A BIT FARTHER TO THE SOUTH AND EAST OVERNIGHT BEFORE
STALLING ROUGHLY ALONG A LINE FROM RUETER IN SOUTHEAST TANEY
COUNTY TO WEST PLAINS TO WINONA IN SHANNON COUNTY. NORTH OF THIS
LINE...ICE ACCUMULATIONS ARE LIKELY FROM TONIGHT INTO MONDAY
MORNING. SIGNIFICANT ICE ACCUMULATIONS ARE EXPECTED NORTH OF A
CASSVILLE IN BARRY COUNTY TO SPARTA IN CHRISTIAN COUNTY TO SALEM
IN DENT COUNTY LINE. YET ANOTHER ROUND OF FREEZING RAIN IS AGAIN
POSSIBLE MONDAY NIGHT INTO TUESDAY.

KSZ073-097-101-MOZ055>058-066>071-077>083-088>095-101>103-101200-
/O.CON.KSGF.IS.W.0002.000000T0000Z-071210T1800Z/
/O.CON.KSGF.WS.A.0003.071210T1800Z-071212T0000Z/
BOURBON-CRAWFORD-CHEROKEE-BENTON-MORGAN-MILLER-MARIES-VERNON-
ST. CLAIR-HICKORY-CAMDEN-PULASKI-PHELPS-BARTON-CEDAR-POLK-DALLAS-
LACLEDE-TEXAS-DENT-JASPER-DADE-GREENE-WEBSTER-WRIGHT-NEWTON-
LAWRENCE-CHRISTIAN-MCDONALD-BARRY-STONE-
INCLUDING THE CITIES OF...FORT SCOTT...PITTSBURG...
BAXTER SPRINGS...COLUMBUS...WARSAW...COLE CAMP...VERSAILLES...
ELDON...LAKE OZARK...VIENNA...NEVADA...APPLETON CITY...OSCEOLA...
HERMITAGE...OSAGE BEACH...CAMDENTON...FORT LEONARD WOOD...
WAYNESVILLE...ROLLA...LAMAR...EL DORADO SPRINGS...STOCKTON...
BOLIVAR...BUFFALO...LEBANON...HOUSTON...CABOOL...SALEM...JOPLIN...
CARTHAGE...GREENFIELD...SPRINGFIELD...MARSHFIELD...ROGERSVILLE...
MOUNTAIN GROVE...MANSFIELD...NEOSHO...AURORA...MOUNT VERNON...
NIXA...OZARK...ANDERSON...PINEVILLE...MONETT...CASSVILLE...
KIMBERLING CITY...GALENA
945 PM CST SUN DEC 9 2007

...ICE STORM WARNING REMAINS IN EFFECT UNTIL 12 PM CST MONDAY...
...WINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON
THROUGH TUESDAY AFTERNOON...

AN ICE STORM WARNING REMAINS IN EFFECT UNTIL 12 PM CST MONDAY. A
WINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON
THROUGH TUESDAY AFTERNOON.

ADDITIONAL ICE ACCUMULATIONS FROM A QUARTER TO A HALF OF AN INCH
WILL BE LIKELY TONIGHT INTO MONDAY MORNING...WITH LOCALIZED
HIGHER AMOUNTS. AREAS NORTH OF A CASSVILLE IN BARRY COUNTY TO
SPARTA IN CHRISTIAN COUNTY TO SALEM IN DENT COUNTY LINE CAN
EXPECT POWER OUTAGES...TREE DAMAGE...AND DETERIORATING ROAD
CONDITIONS AS A RESULT OF SIGNIFICANT ICE ACCUMULATION.

ANOTHER ROUND OF PRECIPITATION WILL LIKELY SPREAD OVER THE REGION
FROM MONDAY NIGHT INTO TUESDAY. SIGNIFICANT ICE ACCUMULATIONS...
UP TO ONE HALF OF AN INCH...WILL AGAIN BE POSSIBLE OVER PORTIONS
OF THE MISSOURI OZARKS AND SOUTHEAST KANSAS. THE MOST LIKELY AREA
FOR ADDITIONAL ICE ACCUMULATION WOULD BE NORTH OF INTERSTATE 44...
BUT THE EXACT LOCATION OF THE HEAVIEST ACCUMULATION REMAINS
UNCLEAR.

MAKE SURE YOU HAVE AN ADEQUATE SUPPLY OF FOOD. CHECK
PRESCRIPTIONS TO ENSURE AN ADEQUATE SUPPLY THROUGH THE DURATION
OF THE STORM. CHECK FURNACES AND FUEL LEVELS. DO NOT RUN
GENERATORS IN ENCLOSED AREAS! TRAVEL IS DISCOURAGED BUT IF
NECESSARY...MAKE SURE YOUR CAR IS WINTERIZED AND IN GOOD WORKING
ORDER AND CARRY ALONG A SAFETY SUPPLY KIT THAT INCLUDES FOOD...
BLANKETS AND A CELL PHONE.

POWER OUTAGES AND THE ACCUMULATION OF ICE ON TRANSMITTERS MAY
ALSO LEAD TO THE INTERRUPTION OF NOAA WEATHER RADIO BROADCASTS.

$$


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