HAZARDOUS WEATHER OUTLOOK
Issue Date: 448 AM CST MON DEC 21 2009
Expiration: 1200 PM CST MON DEC 21 2009
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...TODAY AND TONIGHT...
THUNDERSTORM OUTLOOK...
THUNDERSTORMS ARE NOT EXPECTED THROUGH TONIGHT.
DISCUSSION...
BY LATE TONIGHT...SOUTHERLY WINDS WILL JUST BEGIN TO DRAW UP
INCREASING GULF MOISTURE INTO SOUTHERN AND CENTRAL OKLAHOMA. THE
MOISTURE RETURN WILL BE CAPPED BY WARM AND STABLE AIR...AND
THUNDERSTORMS ARE NOT EXPECTED.
PROBABILITY TABLE...
VALID THROUGH 700 AM CST TUESDAY DEC 22.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...LESS THAN 5 PERCENT.
OTHER HAZARDOUS WEATHER...
AREAS OF FOG MAY ACCOMPANY THE RETURNING MOISTURE LATE TONIGHT IN
SOUTHERN AND CENTRAL OKLAHOMA.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...
THUNDERSTORM OUTLOOK...
STRONG THUNDERSTORMS ARE POSSIBLE IN SOUTHEAST OKLAHOMA ON
WEDNESDAY. SURFACE LOW PRESSURE WILL INTENSIFY IN WESTERN NORTH
TEXAS...AND SOUTH WINDS WILL PULL GULF MOISTURE INTO SOUTHERN AND
EASTERN OKLAHOMA. THE APPROACH OF AN UPPER LEVEL STORM WILL GENERATE
STRONG LIFT AND WEAK TO MODERATE INSTABILITY OVER SOUTHEAST
OKLAHOMA. ISOLATED SEVERE WEATHER WILL BE POSSIBLE...MAINLY IN THE
FORM OF LARGE HAIL.
OTHER HAZARDOUS WEATHER...
A WINTER STORM MAY AFFECT NORTHERN AND WESTERN OKLAHOMA WEDNESDAY
NIGHT AND THURSDAY. BITTER COLD WILL THEN AFFECT ALL OF OKLAHOMA AND
WESTERN NORTH TEXAS IN THE DAYS FOLLOWING THE STORM.
FORECASTS HAVE NARROWED TOWARD A MORE CONFIDENT SOLUTION REGARDING
THE TRACK OF AN IMPENDING STORM SYSTEM. FROM WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING...LOW PRESSURE WILL STRENGTHEN AS IT TRACKS
FROM WESTERN NORTH TEXAS UP THROUGH SOUTHERN AND EASTERN OKLAHOMA.
RAIN WILL TURN TO SNOW AS COLD AIR RUSHES IN FROM THE NORTH AND
WEST. THIS STORM IS LIKELY TO RESULT IN ACCUMULATING SNOWFALL OVER
PARTS OF NORTHERN AND WESTERN OKLAHOMA WEDNESDAY NIGHT AND THURSDAY.
THERE IS ALSO A CHANCE OF SOME SNOW ACCUMULATION IN CENTRAL OKLAHOMA
DURING THE DAY THURSDAY. DURING THE STORM...TEMPERATURES WILL FALL
SIGNIFICANTLY...AND WINDS WILL BECOME INCREASINGLY BLUSTERY.
THE AMOUNT OF SNOW AND BLOWING SNOW WILL BE STRONGLY AFFECTED BY HOW
QUICKLY COLD AIR ARRIVES...AND THE FORWARD SPEED OF THE STORM.
FORECASTS WILL BE UPDATED...AND A WINTER STORM WATCH MAY BE
ISSUED...AS THESE DETAILS COME INTO FOCUS.
WHEN THE STORM EXITS...A LARGE MASS OF ARCTIC AIR...THE COLDEST YET
THIS SEASON...WILL OVERSPREAD THE ENTIRE REGION. WIND CHILL
TEMPERATURES MAY BECOME DANGEROUSLY LOW...AND AIR TEMPERATURES WILL
REMAIN NEAR OR BELOW FREEZING FOR SEVERAL DAYS BEGINNING THURSDAY.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT NOON
TODAY.
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