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An Ice Storm Warning is issued by the National Weather Service of the United States when freezing rain produces a significant and possibly damaging accumulation of ice. The criteria for this warning vary from state to state, but typically an ice storm warning will be issued any time more than 1⁄4 inch (6.4 mm) of ice is expected to accumulate in an area; in some areas, the criterion is 1⁄2 inch (13 mm).
A freezing rain advisory or freezing drizzle advisory will be issued when a small amount of icing is possible.
In Canada, a Freezing Rain Warning has the same meaning.
Example of an ice storm warning
URGENT - WINTER WEATHER MESSAGENATIONAL WEATHER SERVICE SPRINGFIELD MO945 PM CST SUN DEC 9 2007...CONDITIONS RAPIDLY DETERIORATING WEST OF HIGHWAY 65 THISEVENING....THE NEXT WAVE OF PRECIPITATION IS NOW SPREADING INTO SOUTHWESTMISSOURI. AT 930 PM...RADAR INDICATED LIGHT TO MODERATEPRECIPITATION EXTENDING FROM OSCEOLA IN ST. CLAIR COUNTY TONEOSHO IN NEWTON COUNTY. THIS BAND OF PRECIPITATION ALSO LIKELYCONTAINS EMBEDDED THUNDERSTORMS PRODUCING HEAVY PRECIPITATION.OTHER SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMSWERE ALSO DEVELOPING ACROSS EAST CENTRAL OKLAHOMA AND SPREADINGNORTHEAST TOWARDS SOUTH CENTRAL MISSOURI. MEANWHILE...THE FREEZINGLINE CONTINUES TO SLOWLY PUSH SOUTHEAST THIS EVENING. AT 9PM...THE FREEZING LINE EXTENDED FROM BRANSON TO AVA IN DOUGLASCOUNTY TO JUST SOUTH OF SALEM IN DENT COUNTY. THE FREEZING LINEWILL NUDGE A BIT FARTHER TO THE SOUTH AND EAST OVERNIGHT BEFORESTALLING ROUGHLY ALONG A LINE FROM RUETER IN SOUTHEAST TANEYCOUNTY TO WEST PLAINS TO WINONA IN SHANNON COUNTY. NORTH OF THISLINE...ICE ACCUMULATIONS ARE LIKELY FROM TONIGHT INTO MONDAYMORNING. SIGNIFICANT ICE ACCUMULATIONS ARE EXPECTED NORTH OF ACASSVILLE IN BARRY COUNTY TO SPARTA IN CHRISTIAN COUNTY TO SALEMIN DENT COUNTY LINE. YET ANOTHER ROUND OF FREEZING RAIN IS AGAINPOSSIBLE 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...GALENA945 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 AFTERNOONTHROUGH TUESDAY AFTERNOON...AN ICE STORM WARNING REMAINS IN EFFECT UNTIL 12 PM CST MONDAY. AWINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOONTHROUGH TUESDAY AFTERNOON.ADDITIONAL ICE ACCUMULATIONS FROM A QUARTER TO A HALF OF AN INCHWILL BE LIKELY TONIGHT INTO MONDAY MORNING...WITH LOCALIZEDHIGHER AMOUNTS. AREAS NORTH OF A CASSVILLE IN BARRY COUNTY TOSPARTA IN CHRISTIAN COUNTY TO SALEM IN DENT COUNTY LINE CANEXPECT POWER OUTAGES...TREE DAMAGE...AND DETERIORATING ROADCONDITIONS AS A RESULT OF SIGNIFICANT ICE ACCUMULATION.ANOTHER ROUND OF PRECIPITATION WILL LIKELY SPREAD OVER THE REGIONFROM MONDAY NIGHT INTO TUESDAY. SIGNIFICANT ICE ACCUMULATIONS...UP TO ONE HALF OF AN INCH...WILL AGAIN BE POSSIBLE OVER PORTIONSOF THE MISSOURI OZARKS AND SOUTHEAST KANSAS. THE MOST LIKELY AREAFOR ADDITIONAL ICE ACCUMULATION WOULD BE NORTH OF INTERSTATE 44...BUT THE EXACT LOCATION OF THE HEAVIEST ACCUMULATION REMAINSUNCLEAR.MAKE SURE YOU HAVE AN ADEQUATE SUPPLY OF FOOD. CHECKPRESCRIPTIONS TO ENSURE AN ADEQUATE SUPPLY THROUGH THE DURATIONOF THE STORM. CHECK FURNACES AND FUEL LEVELS. DO NOT RUNGENERATORS IN ENCLOSED AREAS! TRAVEL IS DISCOURAGED BUT IFNECESSARY...MAKE SURE YOUR CAR IS WINTERIZED AND IN GOOD WORKINGORDER AND CARRY ALONG A SAFETY SUPPLY KIT THAT INCLUDES FOOD...BLANKETS AND A CELL PHONE.POWER OUTAGES AND THE ACCUMULATION OF ICE ON TRANSMITTERS MAYALSO LEAD TO THE INTERRUPTION OF NOAA WEATHER RADIO BROADCASTS.$$URGENT - WINTER WEATHER MESSAGENATIONAL WEATHER SERVICE PITTSBURGH PA744 PM EST TUE JAN 15 2013MDZ001-WVZ041-160845-/O.CON.KPBZ.IS.W.0001.000000T0000Z-130116T1500Z/GARRETT-TUCKER-INCLUDING THE CITIES OF...OAKLAND MD...GRANTSVILLE...PARSONS...DAVIS...THOMAS744 PM EST TUE JAN 15 2013...ICE STORM WARNING REMAINS IN EFFECT UNTIL 10 AM ESTWEDNESDAY...* HAZARD TYPES...FREEZING RAIN...POSSIBLY BEGINNING AS A MIX WITH SLEET AND SNOW.* ICE ACCUMULATIONS...ONE QUARTER TO ONE HALF OF AN INCH OF ICE.* SLEET AND SNOW ACCUMULATIONS...LESS THAN ONE INCH.* TIMING...A WINTRY MIX OF FREEZING RAIN...SLEET...AND SNOW WILL DEVELOP BEFORE 9 PM...AND CHANGE TO MOSTLY FREEZING RAIN THROUGH THE NIGHT.* LOCATIONS...ALL OF GARRETT COUNTY...AND PARTICULARLY THE EASTERN HALF OF TUCKER COUNTY.* IMPACTS...HAZARDOUS TRAVEL CONDITIONS ARE EXPECTED DUE TO ICE COVERED ROADS. POWER LINES MAY ALSO BE BROUGHT DOWN DUE TO ICE ACCUMULATION.PRECAUTIONARY/PREPAREDNESS ACTIONS...AN ICE STORM WARNING MEANS THAT ICE ACCUMULATION WILL MAKE TRAVELDANGEROUS OR IMPOSSIBLE. ICE ACCUMULATION WILL LIKELY LEAD TOSNAPPED POWER LINES AND FALLING TREE BRANCHES. TRAVEL ISSTRONGLY DISCOURAGED. REPORT ICE ACCUMULATION TO THE NATIONALWEATHER SERVICE BY CALLING 412-262-1988...POSTING TO THE NWSPITTSBURGH FACEBOOK PAGE...OR USING TWITTER @NWSPITTSBURGH.&&$$References
Ice storm warning Wikipedia(Text) CC BY-SA