Public Information Statement
Issued by NWS St. Louis, MO

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13
NOUS43 KLSX 181734

1134 AM CST WED NOV 18 2015

...Winter Weather Awareness Day for Missouri and Winter
 Preparedness Month for Illinois..

The rain has finally stopped, and if you have checked the
forecast for late this week you may seen the dreaded four letter
word: SNOW. Yes we may see a few flakes late this week but it should
be nothing to worry about. However that should remind you that
winter is just around the corner so now is the time to make any
necessary preparations.

Make sure you understand the terminology used by the National
Weather Service (NWS) so you know what to expect. The following
applies to counties covered by the NWS St. Louis. Criteria will
vary in other parts of Missouri and Illinois.

Winter Storm Watch: A watch is issued when the risk of hazardous
weather has increased significantly, there is a strong
possibility it will reach warning criteria, and falls in the 12 -
48 hour portion of the forecast.

Warning: Warnings are issued for events that can be life
threatening. They are issued when the event is occurring, is
imminent, or has a very high probability of occurrence.

Blizzard Warning: Sustained wind or frequent gusts greater than 35
mph accompanied by falling and/or blowing snow reducing the
visibility to less than 1/4 mile for 3 hours or more.

Ice Storm Warning: Freezing rain producing ice accumulations of
1/4 inch or more.

Winter Storm Warning: Issued for snow events of 6 inches or more,
sleet accumulation of 1/2 inch or more, or a combination of
winter precipitation which will produce life threatening

Wind Chill Warning: Wind chill values of minus 25 degrees F or

Advisory: Advisories are issued for lesser events that while
presenting an inconvenience, do not pose an immediate threat of
death, injury or significant property damage.

Winter Weather Advisory: Depending on the time of occurrence and
the temperature, an advisory can be issued for snowfall of 1 - 5
inches, for sleet accumulations of less than 1/2 inch, or a
combination of winter precipitation that will produce hazardous

Freezing Rain Advisory: Light freezing rain producing ice
accumulations of less than 1/4 inch.

Wind Chill Advisory: Wind chill values of minus 15 to minus 24
degrees F.


JPK is the U.S. government's official web portal to all federal, state and local government web resources and services.