Public Information Statement
Issued by NWS Tulsa, OK

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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
800 AM CST TUE NOV 18 2014

ARZ001-002-010-011-019-020-029-181600-
BENTON-CARROLL-WASHINGTON AR-MADISON-CRAWFORD-FRANKLIN-SEBASTIAN-
800 AM CST TUE NOV 18 2014

...WINTER WEATHER AWARENESS IN ARKANSAS...

GOVERNOR MIKE BEEBE HAS PROCLAIMED NOVEMBER 17TH THROUGH 21ST AS
WINTER WEATHER AWARENESS WEEK IN ARKANSAS.  PEOPLE ARE ASKED TO
TAKE SOME TIME AND PREPARE FOR THE UPCOMING WINTER SEASON.

TODAYS TOPIC IS WINTER PRECIPITATION TYPES.

SNOW.  SNOW FORMS IN THE CLOUDS AND REMAINS AS SNOW ALL THE
WAY TO THE GROUND.  IT MOST COMMONLY TAKES THE FORM OF
SNOWFLAKES... WHICH ARE THE FAMILIAR SIX-SIDED ICE CRYSTALS.
IT MAY ALSO FALL IN THE FORM OF SNOW PELLETS OR SNOW GRAINS.

SNOW FLURRIES ARE MOST COMMONLY SEEN AS A FEW SNOWFLAKES
FALLING...ALTHOUGH VISIBILITIES CAN BE REDUCED AT TIMES.
IN NORTHWESTERN ARKANSAS...THE TERM SNOW FLURRIES IS USED
TO INDICATE THAT NO ACCUMULATION IS EXPECTED.

IN ARKANSAS...HEAVIER SNOWS MOST COMMONLY OCCUR WHEN COLD AIR
IS ALREADY IN PLACE OVER THE STATE AND A STRONG UPPER LEVEL
LOW PRESSURE SYSTEM MOVES OUT OF THE SOUTHWESTERN UNITED STATES.
THE LOW SERVES TO PULL MOIST AIR NORTHWARD INTO THE COLD AIR.
LIGHT SNOW OR SNOW FLURRIES CAN ALSO OCCUR IN THE COLD AIR
THAT FOLLOWS THE PASSAGE OF AN ARCTIC COLD FRONT.

SLEET.  SLEET CONSISTS OF PELLETS OF ICE AND IS OFTEN EVEN
REFERRED TO AS ICE PELLETS.  FOR SLEET TO FORM...SNOW FALLS
INTO A RELATIVELY WARM LAYER OF AIR THAT IS ABOVE FREEZING A
FEW THOUSAND FEET ABOVE THE GROUND AND PARTIALLY MELTS.
THIS PARTICLE THEN REFREEZES INTO A PELLET OF ICE WHEN IT
FALLS INTO A LAYER OF AIR THAT IS BELOW FREEZING NEAR THE GROUND.

IN ARKANSAS...SLEET MOST COMMONLY OCCURS IN A NARROW BAND
BETWEEN AN AREA OF RAIN TO THE SOUTH AND AN AREA OF SNOW TO
THE NORTH.

FREEZING RAIN.  FREEZING RAIN IS A PHENOMENON SOMETIMES CALLED
GLAZE BECAUSE IT RESULTS IN A GLAZE OF ICE ON EXPOSED SURFACES.
FOR FREEZING RAIN TO FORM...SNOW FALLS INTO A RELATIVELY
WARM LAYER OF AIR THAT IS ABOVE FREEZING A FEW THOUSAND FEET
ABOVE THE GROUND AND COMPLETELY MELTS.  THIS RAIN DROP THEN
REFREEZES ON EXPOSED SURFACES WHEN IT REACHES THE GROUND...
WHERE TEMPERATURES ARE BELOW 32 DEGREES.  IN THE WORST CASES...
EVERYTHING BECOMES COATED WITH A LAYER OF ICE.  WIDESPREAD POWER
OUTAGES TEND TO OCCUR AS HEAVY GLAZE BREAKS TREE LIMBS THAT FALL ON
POWER LINES.  IN ADDITION...ROAD SURFACES BECOME EXTREMELY HAZARDOUS.

IN ARKANSAS...FREEZING RAIN COMMONLY OCCURS AS AN ARCTIC HIGH
PRESSURE SYSTEM BEGINS TO MOVE AWAY FROM THE STATE.  IN THIS
SITUATION...COLD AIR IS STILL LINGERING AT THE GROUND...BUT WARMER
SOUTHERLY WINDS FROM THE GULF OF MEXICO BEGIN BRINGING MOISTURE BACK
OVER THE TOP OF THE COLD AIR.  SINCE THE AIR AT THE GROUND HAS NOT
WARMED ABOVE FREEZING...THE RAIN THAT FALLS INTO IT FREEZES ON
EXPOSED SURFACES.

FOR ADDITIONAL INFORMATION...CONTACT THE NATIONAL WEATHER SERVICE
OFFICE IN TULSA AT 918-838-7838 OR VISIT OUR WEBSITE AT
WWW.WEATHER.GOV/TULSA

$$





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