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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 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. $$ URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE PITTSBURGH PA 744 PM EST TUE JAN 15 2013 MDZ001-WVZ041-160845- /O.CON.KPBZ.IS.W.0001.000000T0000Z-130116T1500Z/ GARRETT-TUCKER- INCLUDING THE CITIES OF...OAKLAND MD...GRANTSVILLE...PARSONS... DAVIS...THOMAS 744 PM EST TUE JAN 15 2013 ...ICE STORM WARNING REMAINS IN EFFECT UNTIL 10 AM EST WEDNESDAY... * HAZARD TYPES...FREEZING RAIN...POSSIBLY BEGINNING AS A MIX WITH SLEET AND SNOW. * ICE ACCUMULATIONS...ONE QUARTER TO ONE HALF OF AN INCH OF ICE. * SLEET AND SNOW ACCUMULATIONS...LESS THAN ONE INCH. * TIMING...A WINTRY MIX OF FREEZING RAIN...SLEET...AND SNOW WILL DEVELOP BEFORE 9 PM...AND CHANGE TO MOSTLY FREEZING RAIN THROUGH THE NIGHT. * LOCATIONS...ALL OF GARRETT COUNTY...AND PARTICULARLY THE EASTERN HALF OF TUCKER COUNTY. * IMPACTS...HAZARDOUS TRAVEL CONDITIONS ARE EXPECTED DUE TO ICE COVERED ROADS. POWER LINES MAY ALSO BE BROUGHT DOWN DUE TO ICE ACCUMULATION. PRECAUTIONARY/PREPAREDNESS ACTIONS... AN ICE STORM WARNING MEANS THAT ICE ACCUMULATION WILL MAKE TRAVEL DANGEROUS OR IMPOSSIBLE. ICE ACCUMULATION WILL LIKELY LEAD TO SNAPPED POWER LINES AND FALLING TREE BRANCHES. TRAVEL IS STRONGLY DISCOURAGED. REPORT ICE ACCUMULATION TO THE NATIONAL WEATHER SERVICE BY CALLING 412-262-1988...POSTING TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER @NWSPITTSBURGH. && $$References
Ice storm warning Wikipedia(Text) CC BY-SA