ZCZC LITWRKPNS
TTAA00 KLIT 050552
ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-182000-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
600 AM CST WED NOV 18 2015

...WINTER WEATHER WATCHES - WARNINGS - AND ADVISORIES...

NOVEMBER 16TH THROUGH 20TH IS WINTER WEATHER AWARENESS WEEK IN
ARKANSAS. PEOPLE ARE ASKED TO TAKE SOME TIME TO PREPARE FOR
THE UPCOMING WINTER SEASON.

TODAYS TOPIC IS WINTER WEATHER WATCHES...WARNINGS...AND ADVISORIES.

A WATCH INDICATES THAT CONDITIONS ARE FAVORABLE FOR A WINTER STORM
TO DEVELOP OVER ALL OR PART OF A FORECAST AREA...BUT THE
OCCURRENCE...LOCATION...OR TIMING IS STILL UNCERTAIN. WATCHES ARE
GENERALLY ISSUED WHEN THERE IS A 50 PERCENT OR GREATER CHANCE
OF A WINTER STORM. IN ARKANSAS...WATCHES ARE USUALLY ISSUED 12 TO 
24 HOURS IN ADVANCE OF THE ANTICIPATED WEATHER. HOWEVER...THEY 
CAN BE ISSUED AS MUCH AS 48 HOURS IN ADVANCE. THE TERM WINTER 
STORM WATCH IS ALWAYS USED NO MATTER WHAT TYPES OF WINTRY 
PRECIPITATION ARE EXPECTED.

A WARNING INDICATES THAT WINTER STORM CONDITIONS ARE OCCURRING...
IMMINENT...OR HAVE A VERY HIGH PROBABILITY OF OCCURRING. WARNINGS
ARE GENERALLY ISSUED WHEN THERE IS AN 80 PERCENT OR GREATER CHANCE
OF A WINTER STORM. WARNINGS ARE ISSUED FOR CONDITIONS POSING A 
THREAT TO LIFE OR PROPERTY. IN ARKANSAS...WARNINGS ARE USUALLY 
ISSUED FOR WEATHER THAT IS EXPECTED TO OCCUR WITHIN THE NEXT 12 
HOURS. HOWEVER...THEY CAN BE ISSUED AS MUCH AS 36 HOURS IN ADVANCE.
 
AN ADVISORY IS ISSUED FOR SIMILAR CONDITIONS TO A WARNING...EXCEPT
THAT CONDITIONS ARE EXPECTED TO BE LESS SERIOUS. IN OTHER WORDS...
SNOW OR ICE IS EXPECTED...BUT AMOUNTS WILL BE LESS THAN REQUIRED 
FOR A WARNING. STILL...CONDITIONS WILL CAUSE SIGNIFICANT 
INCONVENIENCE...AND IF CAUTION IS NOT EXERCISED...COULD LEAD TO 
SITUATIONS THAT MAY THREATEN LIFE OR PROPERTY. IN ARKANSAS...
ADVISORIES ARE USUALLY ISSUED FOR WEATHER THAT IS EXPECTED TO OCCUR 
WITHIN THE NEXT 12 HOURS. HOWEVER...THEY CAN BE ISSUED AS MUCH AS 
36 HOURS IN ADVANCE.

HEAVY SNOW WOULD REQUIRE A WATCH AND/OR A WARNING. THE GENERAL 
DEFINITION OF HEAVY SNOW IS 4 INCHES OR MORE IN 12 HOURS...OR 6 
INCHES OR MORE IN 24 HOURS. DUE TO THE RELATIVE RARITY OF SNOW IN 
ARKANSAS AND ELSEWHERE IN THE SOUTHERN UNITED STATES...A WATCH OR 
WARNING COULD BE ISSUED FOR SOMEWHAT SMALLER AMOUNTS.

AN ADVISORY IS ISSUED FOR SNOW AMOUNTS THAT ARE SMALLER THAN WARNING 
CRITERIA. FOR EXAMPLE...IF 4 INCHES OF SNOW IS REQUIRED FOR A
WARNING...AN ADVISORY WOULD BE ISSUED WHEN 1 TO 3 INCHES OF SNOW 
ARE EXPECTED.

A BLIZZARD WOULD ALSO REQUIRE A WATCH AND/OR A WARNING. A BLIZZARD
IS DEFINED AS SUSTAINED WINDS OR FREQUENT GUSTS OF 35 MPH OR
HIGHER...AND CONSIDERABLE FALLING OR BLOWING SNOW CAUSING VISIBILITY
TO BE FREQUENTLY LESS THAN 1/4 MILE. NOTE THAT EVEN IF A VERY LARGE
AMOUNT OF SNOW FALLS...THIS STILL DOES NOT CONSTITUTE A BLIZZARD
UNLESS THE WIND CRITERIA ARE MET ALSO. A BLIZZARD IS AN EXTREMELY
RARE EVENT IN ARKANSAS.

AN ICE STORM WOULD REQUIRE A WATCH AND/OR A WARNING. ICE STORMS OCCUR 
WHEN FREEZING RAIN DEPOSITS SIGNIFICANT OR DAMAGING AMOUNTS OF ICE...
USUALLY 1/4 INCH OF ICE OR MORE. FOR LESSER AMOUNTS OF ICE...AN 
ADVISORY WOULD BE REQUIRED.

HEAVY SLEET WOULD REQUIRE A WATCH AND/OR A WARNING. THIS IS GENERALLY 
DEFINED AS SLEET COVERING THE GROUND TO A DEPTH OF 1/2 INCH OR MORE.
AN ADVISORY WOULD BE REQUIRED FOR LESSER AMOUNTS OF SLEET.

FREEZE WARNINGS ARE NORMALLY ISSUED FOR THE FIRST FEW FREEZES IN THE 
FALL AND FOR LATE SEASON FREEZES IN THE SPRING. IN FAR SOUTH
ARKANSAS WHERE FREEZES ARE MORE UNCOMMON...FREEZE WARNINGS MAY BE 
ISSUED AT ANY TIME DURING THE WINTER.

FROST ADVISORIES ARE ISSUED FOR THE FIRST FEW FROSTS IN THE FALL AND
FOR LATE SEASON FROSTS IN THE SPRING. 

THE NATIONAL WEATHER SERVICE HAS SIMPLIFIED THE TYPES OF WARNINGS AND 
ADVISORIES. THE ONLY EVENT-SPECIFIC WARNINGS THAT WILL BE ISSUED IN 
ARKANSAS ARE BLIZZARD WARNINGS...ICE STORM WARNINGS...AND WIND CHILL 
WARNINGS. ALL OTHER WARNINGS WILL BE ISSUED AS WINTER STORM WARNINGS. 
LIKEWISE...FOR ADVISORIES...THE ONLY EVENT-SPECIFIC ADVISORIES THAT 
WILL BE ISSUED ARE FREEZING RAIN ADVISORIES AND WIND CHILL ADVISORIES. 
ALL OTHER ADVISORIES WILL BE ISSUED AS WINTER WEATHER ADVISORIES. 
WHEN EACH WARNING OR ADVISORY IS ISSUED...THE TEXT WILL STATE WHAT 
TYPES OF WINTER WEATHER ARE EXPECTED.

WIND CHILL WARNINGS ARE RELATIVELY NEW. IN THE COUNTIES FOR
WHICH THE NATIONAL WEATHER SERVICE IN LITTLE ROCK MAKES THE 
FORECAST...WARNINGS WILL BE ISSUED FOR WIND CHILLS OF 15 BELOW
ZERO OR LOWER WHEN WINDS AVERAGE 10 MPH OR MORE...AND CONDITIONS 
ARE EXPECTED TO PERSIST FOR AN HOUR OR MORE. DIFFERENT CRITERIA MAY
BE USED IN OTHER SECTIONS OF ARKANSAS FOR WHICH WEATHER OFFICES
IN TULSA...MEMPHIS...JACKSON MISSISSIPPI...AND SHREVEPORT MAKE
THE FORECAST.

WIND CHILL ADVISORIES...IN THE COUNTIES FOR WHICH THE NATIONAL
WEATHER SERVICE IN LITTLE ROCK MAKES THE FORECAST...ARE ISSUED FOR
WIND CHILLS OF ZERO DEGREES OR LOWER WHEN WINDS AVERAGE 10 MPH OR 
MORE...AND CONDITIONS ARE EXPECTED TO PERSIST FOR THREE HOURS OR
MORE. DIFFERENT CRITERIA MAY BE USED IN OTHER SECTIONS OF 
ARKANSAS FOR WHICH WEATHER OFFICES IN TULSA...MEMPHIS...JACKSON 
MISSISSIPPI...AND SHREVEPORT MAKE THE FORECAST.

FREEZING FOG ADVISORIES ARE ISSUED WHEN FOG IS PRESENT WITH 
TEMPERATURES BELOW FREEZING...AND THE FOG IS EXPECTED TO CAUSE A
THIN LAYER OF ICE TO DEVELOP ON BRIDGES...OVERPASSES...AND OTHER
ELEVATED ROADWAYS. THE ISSUANCE OF FREEZING FOG ADVISORIES BEGAN
AS AN EXPERIMENT 14 WINTERS AGO AT THE NATIONAL WEATHER SERVICE 
IN LITTLE ROCK. THE EXPERIMENT WAS A SUCCESS. AS A RESULT...THESE
ADVISORIES CAN NOW BE ISSUED BY NATIONAL WEATHER SERVICE OFFICES 
NATIONWIDE.

&&

PLEASE VISIT OUR WEB SITE AT   WWW.SRH.NOAA.GOV/LZK

$$

46

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