Severe/Winter Weather Guides
About This Page
The National Weather Service authors Severe and Winter Weather guides annually. The guides serve to educate the public about hazardous weather and how to prepare for severe and winter storms.
Winter Guide (Headlines/Pg 2)
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Weather headlines (i.e. watches, warnings, advisories) do not always include precipitation. For example, a Wind Chill Advisory is issued by the National Weather Service in Little Rock when wind chill indices are expected to reach 0 degrees for at least three hours (with wind speeds of 10 mph or more). 

A Wind Chill Warning is issued when wind chill indices are expected to reach -15 degrees for at least one hour (with wind speeds of 10 mph or more). 

How are these indices calculated?

Wind Chill Chart
In the picture: The wind chill chart shows how wind index values change as temperatures and wind speeds vary. For the most part, wind index values drop as temperatures decrease and wind speeds increase.  


Wind chill indices are calculated by combining the effects of temperature and wind speed...with the wind chill index representing how cold it feels to exposed skin. For example, given an air temperature of 20 degrees and a wind of 15 mph...the wind chill index would be 6 degrees.


Links of Interest


Look for this sign when it is cold and fog (or freezing precipitation) is present. By the way, while the wind chill temperature is a good example of a non-precipitation hazard...another hazard to consider is freezing fog. 


Watch for freezing fog this winter! If fog happens to form with temperatures at or below freezing, icing may occur on roadways...and especially on bridges and overpasses. Should this occur, the National Weather Service would likely issue a Freezing Fog Advisory. is the U.S. government's official web portal to all federal, state and local government web resources and services.