Winter Weather Terminology



PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
1039 AM EST MON NOV 8 1999

...OHIO WINTER SAFETY AWARENESS WEEK CONTINUES THROUGH NOVEMBER
13TH...

KNOWING NATIONAL WEATHER SERVICE WINTER FORECAST TERMINOLOGY
WILL HELP YOU BETTER UNDERSTAND OUR PRODUCTS.  SOME WINTER
WEATHER DEFINITIONS INCLUDE THE FOLLOWING:

HEAVY SNOW:  6 INCHES OR MORE OF SNOW IN 24 HOURS...ACROSS NORTHERN 
OHIO.  5 INCHES OR MORE OF SNOW IN 24 HOURS...ACROSS CENTRAL AND 
SOUTHERN OHIO.

SNOW SQUALL:  AN INTENSE FALL OF ACCUMULATING SNOW...REDUCING THE 
VISIBILITY SIGNIFICANTLY...AND OFTEN ACCOMPANIED BY INCREASED WIND.

SLEET:  SOLID GRAINS OF ICE THAT FORM FROM RAIN THAT FREEZES BEFORE 
REACHING THE GROUND.  THESE PELLETS OF ICE TEND TO BOUNCE UPON 
CONTACT...AND MAY ACCUMULATE ENOUGH TO COVER THE GROUND...EVEN
TO A DEPTH OF SEVERAL INCHES.

FREEZING RAIN:  RAIN THAT FREEZES UPON CONTACT WITH A COLD SURFACE.

THE NATIONAL WEATHER SERVICE ISSUES WARNINGS AND WATCHES  TO ALERT
THE PUBLIC TO THE POTENTIAL FOR SEVERE WINTER WEATHER.  DURING THE 
WINTER SEASON...YOU MAY HEAR THE FOLLOWING:

WINTER STORM WATCH:  CONDITIONS EXIST FOR THE POSSIBLE OCCURRENCE
OF SEVERE WINTER WEATHER SUCH AS BLIZZARD CONDITIONS...HEAVY 
SNOW...SIGNIFICANT FREEZING RAIN OR HEAVY SLEET.  THE WATCH IS
USUALLY ISSUED 12 TO 36 HOURS IN ADVANCE OF THE WINTER STORM.

WINTER STORM WARNING:  ISSUED TO ALERT THE PUBLIC TO IMMINENT SEVERE 
WINTER WEATHER.  HEAVY SNOW...SIGNIFICANT FREEZING RAIN OR SLEET IS 
EXPECTED.  A WARNING IS USUALLY ISSUED 6 TO 24 HOURS IN ADVANCE OF
THE WINTER STORM.  NORMALLY...A WARNING IS ISSUED AFTER A WINTER
STORM WATCH HAS BEEN IN EFFECT.  IF A WINTER STORM DEVELOPS 
QUICKLY...THEN THE WARNING MAY NOT HAVE BEEN PRECEDED BY A WATCH.

BLIZZARD WARNING: ISSUED WHEN SUSTAINED OR GUSTY WINDS OF 35 MPH OR 
MORE ARE EXPECTED TO REDUCE VISIBILITY AT...OR BELOW A QUARTER OF A 
MILE DUE TO FALLING AND...OR BLOWING SNOW FOR AT LEAST THREE HOURS.

WIND CHILL WARNING:  ISSUED FOR WIND CHILLS BELOW -34 DEGREES 
FAHRENHEIT.

A LESS SEVERE WINTER WEATHER EVENT WILL PROMPT THE ISSUANCE OF A
WINTER WEATHER ADVISORY.  TRAVEL BY FOOT OR VEHICLE MAY BE
DANGEROUS DURING AN ADVISORY EVEN IF THE WINTER WEATHER IS NOT
FORECAST TO REACH WINTER STORM CRITERIA.



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