SPECIAL WEATHER STATEMENT
Issue Date: 617 PM CST TUE DEC 22 2009
Expiration: 1200 AM CST WED DEC 23 2009
...LATE WEEK STORM WILL BRING STRONG WINDS...VERY COLD AIR...AND
SOME SNOW...
WINTER WEATHER MAY DEVELOP OVER THE SOUTHERN PLAINS BEGINNING
WEDNESDAY EVENING AS A STORM SYSTEM INTENSIFIES AND TRACKS FROM THE
SOUTHERN ROCKIES EASTWARD ACROSS THE PLAINS. STRONG NORTHERLY WINDS
AND MUCH COLDER AIR WILL RESULT IN A COLD AND BLUSTERY CHRISTMAS EVE
WITH WIND CHILL TEMPERATURES IN THE SINGLE DIGITS TO 20S. ALTHOUGH
WIND SPEEDS WILL DECREASE LATE ON CHRISTMAS DAY...IT WILL STILL BE
COLD...WITH HIGHS ONLY IN THE UPPER 20S AND 30S.
THE STORM WILL BEGIN TO TAKE SHAPE TONIGHT AS COLDER AIR BEGINS TO
MOVE INTO NORTHWESTERN OKLAHOMA. ON WEDNESDAY...A COLD FRONT WILL
SPREAD TOWARD THE SOUTHEAST...SLOWLY AT FIRST...BUT MORE RAPIDLY BY
EVENING. FREEZING TEMPERATURES WILL REACH CENTRAL AND SOUTHWEST
OKLAHOMA...AND WESTERN NORTH TEXAS...BY THURSDAY MORNING.
AS COLD AIR CONTINUES TO SPREAD INTO THE AREA... RAIN MAY MIX WITH
OR CHANGE TO SNOW OVER NORTHWESTERN OKLAHOMA LATE WEDNESDAY
AFTERNOON... AND MUCH OF WESTERN OKLAHOMA AND PORTIONS OF WESTERN
NORTH TEXAS BEFORE SUNRISE ON THURSDAY. RAIN MAY THEN MIX WITH OR
CHANGE TO SNOW BEFORE PRECIPITATION ENDS ACROSS THE REMAINDER OF THE
AREA DURING THE DAY ON THURSDAY.
THE LATE ARRIVAL OF COLD AIR AND THE PROGRESSIVE NATURE OF THE UPPER
LOW WILL LIMIT SNOWFALL TOTALS. STILL...IT DOES APPEAR THAT 1 TO 3
INCHES OF SNOW MAY ACCUMULATE IN NORTHERN OKLAHOMA...ESPECIALLY
AROUND WOODWARD TO ENID AND PONCA CITY EARLY THURSDAY. SOME LIGHT
SNOW ACCUMULATION MAY EXTEND AS FAR SOUTH AND WEST AS OKLAHOMA CITY
AND CLINTON. INCREASINGLY BLUSTERY WINDS WILL RESULT IN BLOWING SNOW
AND REDUCED VISIBILITY.
HAZARDOUS WINTER WEATHER WILL PERSIST EVEN AFTER THE PRECIPITATION
ENDS. A LARGE MASS OF ARCTIC AIR...THE COLDEST YET THIS
SEASON...WILL OVERSPREAD ALL OF OKLAHOMA AND WESTERN NORTH TEXAS.
WIND CHILL TEMPERATURES MAY BECOME DANGEROUSLY LOW...ESPECIALLY
THURSDAY NIGHT AND FRIDAY. AIR TEMPERATURES ACROSS NORTHERN OKLAHOMA
COULD REMAIN NEAR OR BELOW FREEZING FOR AS LONG AS THREE OR FOUR
DAYS.
HAZARDOUS WEATHER OUTLOOK
Issue Date: 550 PM CST TUE DEC 22 2009
Expiration: 500 AM CST WED DEC 23 2009
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...THROUGH TONIGHT...
THUNDERSTORM OUTLOOK...
THUNDERSTORMS ARE POSSIBLE MAINLY LATE TONIGHT IN CENTRAL AND
SOUTHERN OKLAHOMA... AND PARTS OF WESTERN NORTH TEXAS. SEVERE
THUNDERSTORMS ARE NOT EXPECTED.
DISCUSSION...
SURFACE LOW PRESSURE WILL INTENSIFY IN WEST TEXAS AND SOUTH WINDS
WILL CONTINUE TO PULL GULF MOISTURE NORTHWARD INTO OKLAHOMA AND
WESTERN NORTH TEXAS THROUGH TONIGHT. A STRENGTHENING LOW LEVEL JET
MAY AID IN THE DEVELOPMENT OF A FEW THUNDERSTORMS IN CENTRAL AND
SOUTHERN OKLAHOMA... AND PARTS OF WESTERN NORTH TEXAS. HOWEVER...
THE INSTABILITY WILL REMAIN LIMITED AND SEVERE THUNDERSTORMS ARE NOT
EXPECTED.
PROBABILITY TABLE...
VALID THROUGH 700 AM CST WEDNESDAY DEC 23.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...50 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...10 PERCENT.
OTHER HAZARDOUS WEATHER...
NONE.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...
THUNDERSTORM OUTLOOK...
STRONG THUNDERSTORMS WILL BE POSSIBLE OVER PARTS OF CENTRAL AND
SOUTHEAST OKLAHOMA WEDNESDAY. MOISTURE AND INSTABILITY WILL CONTINUE
TO INCREASE AS SOUTHERLY WINDS PREVAIL TO THE EAST OF A COLD FRONT
ACROSS NORTHWEST OKLAHOMA. WIND SHEAR WILL ALSO INCREASE AS THE
UPPER LEVEL STORM SYSTEM NEARS THE AREA. THE INCREASING INSTABILITY
AND SHEAR WILL BE FAVORABLE FOR A FEW SEVERE THUNDERSTORMS OVER
PARTS OF SOUTHEAST OKLAHOMA. THE MAIN THREAT WILL BE LARGE HAIL.
OTHER HAZARDOUS WEATHER...
A WINTER STORM WILL AFFECT THE SOUTHERN PLAINS FROM LATE TUESDAY
THROUGH AT LEAST THURSDAY. RAIN COULD CHANGE TO SNOW WEDNESDAY NIGHT
INTO THURSDAY. SOME SNOW ACCUMULATIONS WILL BE POSSIBLE... MAINLY
OVER NORTHERN OKLAHOMA. HOWEVER...ALL AREAS WILL BE IMPACTED BY THE
COMBINATION OF COLD TEMPERATURES AND STRONG NORTHERLY WINDS... WHICH
WILL RESULT IN LOW WIND CHILL VALUES. IN AREAS THAT DO SEE SNOW
ACCUMULATIONS... THE STRONG WINDS WILL LIKELY RESULT IN AREAS OF
BLOWING SNOW AND LOWER VISIBILITY.
AS THE STORM EXITS... A LARGE MASS OF ARCTIC AIR WILL OVERSPREAD THE
SOUTHERN PLAINS. THE COLD AIRMASS COMBINED WITH STRONG WINDS WILL
RESULT IN DANGEROUSLY LOW WIND CHILL TEMPERATURES BOTH THURSDAY AND
FRIDAY.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM
WEDNESDAY.
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