HAZARDOUS WEATHER OUTLOOK
Issue Date: 454 AM CST SUN DEC 20 2009
Expiration: 1200 PM CST SUN DEC 20 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...
A TROUGH WILL ACT PRIMARILY TO SHIFT THE WIND DIRECTION FROM
SOUTHWEST TO NORTHWEST...AS IT MOVES INTO OKLAHOMA TODAY. AIR WILL
REMAIN DRY AND STABLE ON BOTH SIDES OF THE TROUGH.
PROBABILITY TABLE...
VALID THROUGH 700 AM CST MONDAY DEC 21.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...ZERO PERCENT.
OTHER HAZARDOUS WEATHER...
NONE.
.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...
THUNDERSTORM OUTLOOK...
THUNDERSTORMS ARE POSSIBLE BY THE MIDDLE OF THE WEEK. ON TUESDAY...
LOW PRESSURE WILL FORM IN WESTERN NORTH TEXAS ALONG A STALLED AND
STRENGTHENING FRONTAL BOUNDARY. GULF MOISTURE WILL MOVE UP AHEAD OF
THE LOW...INTO SOUTHEAST OKLAHOMA. RAIN AND THUNDERSTORMS ARE
POSSIBLE BY LATE TUESDAY NIGHT...BUT ESPECIALLY ON WEDNESDAY...AS AN
UPPER LEVEL LOW APPROACHES. THE MAIN HAZARDS WILL BE CLOUD TO GROUND
LIGHTNING AND SMALL HAIL.
OTHER HAZARDOUS WEATHER...
ICE AND SNOW ARE FORECAST FROM WEDNESDAY INTO THURSDAY. STRONG LIFT
AHEAD OF THE UPPER LOW WILL CAUSE THE SURFACE LOW TO INTENSIFY...
RESULTING IN AN ORGANIZED WEATHER SYSTEM. GULF MOISTURE AND STRONG
LIFT WILL BE IN PLACE...WHILE COLD AIR WILL BE RUSHING IN FROM THE
NORTHWEST DURING THE STORM. PRECIPITATION MAY BEGIN AS SNOW IN
NORTHWEST OKLAHOMA...BUT ELSEWHERE THERE WILL BE A GRADUAL
TRANSITION FROM RAIN TO SNOW. IF THE COLD AIR ARRIVES FAST ENOUGH
AND DEEP ENOUGH...THIS COULD BECOME A WINTER STORM FOR PART OF
OKLAHOMA...ESPECIALLY NORTH AND WEST.
BEHIND THE STORM...ARCTIC AIR WILL OVERSPREAD THE SOUTHERN PLAINS.
TEMPERATURES MAY REMAIN NEAR OR BELOW FREEZING FOR AN EXTENDED TIME
BETWEEN THURSDAY AND SATURDAY. WIND CHILL TEMPERATURES COULD BECOME
DANGEROUSLY LOW...ESPECIALLY IN NORTHERN OKLAHOMA.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT NOON
TODAY.
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