Ice storm warning

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).[1]

Ice covered trees in Muncie, Indiana

Prior to October 2017, a freezing rain advisory or freezing drizzle advisory was issued when a small amount of icing was possible.

In Canada, a freezing rain warning has the same meaning.

Example of an ice storm warning

 
632
WWUS44 KLZK 200235
WSWLZK

URGENT - WINTER WEATHER MESSAGE
National Weather Service Little Rock AR
835 PM CST Tue Feb 19 2019

ARZ003-012-013-200600-
/O.UPG.KLZK.WW.Y.0004.000000T0000Z-190220T0600Z/
/O.NEW.KLZK.IS.W.0001.190220T0235Z-190220T0600Z/
Boone-Newton-Searcy-
Including the cities of Harrison, Omaha, Lead Hill, Jasper,
Western Grove, Deer, Marshall, Leslie, and Gilbert
835 PM CST Tue Feb 19 2019

...ICE STORM WARNING IN EFFECT UNTIL MIDNIGHT CST TONIGHT...

* WHAT: Significant icing. Storm total ice accumulations of around
  two to three tenths of an inch are expected...mainly on trees
  and power lines.

* WHERE: Boone, Newton and Searcy Counties.

* WHEN: Until midnight CST tonight.

* ADDITIONAL DETAILS: The ice will result in tree limbs breaking
  and potential for power outages. There may also be some slick
  spots on bridges and overpasses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

An Ice Storm Warning means significant amounts of ice
accumulation are expected and may result in snapped power lines
and falling tree branches. Be sure to check road conditions
before traveling in these areas. Visit the Arkansas Department of
Transportation's website Idrivearkansas.com for the latest road
and traffic conditions.

&&

$$

[2]

See also

References
  1. National Weather Service. "Ice storm warning". Glossary - NOAA's National Weather Service. Retrieved 17 May 2011.
  2. https://mesonet.agron.iastate.edu/vtec/#2019-O-NEW-KLZK-IS-W-0001/USCOMP-N0Q-201902200235
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