Area forecast discussion, from the National Weather Service, Norman

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
307 PM CST SAT JAN 12 2013

.DISCUSSION…
PRECIPITATION IS INCREASING IN A FEW AREAS… SHOWERS AND STORMS
EAST… A WINTRY MIX SOUTH CENTRAL.. CENTRAL AND NORTH CENTRAL
OKLAHOMA… AND VIRGA/SNOW WEST. LOW LEVEL TEMPERATURES WILL COOL
AS PRECIPITATION MOISTENS LOWER LAYERS AND TEMPERATURES APPROACH
WET BULB. THIS WILL BRING THE TEMPERATURE DOWN TO NEAR OR BELOW
FREEZING IN MANY AREAS. MEANWHILE… MID LEVELS ARE DRYING AS
SHORTWAVE MOVES THROUGH THE AREA AS SEEN ON WATER VAPOR LOOP. IN
TIME… THIS WILL REMOVE HIGH RH FROM THE DENDRITIC GROWTH ZONE
TEMPERATURE RANGE USHERING IN A TREND MORE TOWARD FREEZING RAIN
AND FREEZING DRIZZLE. SO ALTHOUGH PRECIPITATION AMOUNTS WILL
GENERALLY BE LIGHT… THE FORECAST OF FREEZING RAIN/FREEZING
DRIZZLE MAY STILL CAUSE ISSUES INTO THE EVENING HOURS ACROSS
CENTRAL AND NORTH CENTRAL OKLAHOMA… SO WILL LEAVE THE WINTER
WEATHER ADVISORY UP. DID NOT GET TOO TRICKY WITH THE PRECIPITATION
TYPES IN THE PACKAGE… KEEPING IT SNOW NORTHWEST… RAIN
SOUTHEAST WHERE TEMPERATURES WILL REMAIN ABOVE FREEZING FOR A
WHILE… AND FREEZING RAIN/SNOW/SLEET IN BETWEEN THESE AREAS.

NAM ALSO SHOWS LOW-LEVEL LIFT REDEVELOPING IN THE 06Z-14Z TIME
FRAME… ESPECIALLY IN THE SOUTHWEST. IF THIS VERIFIES… FREEZING
DRIZZLE WILL BE A POSSIBILITY AFTER MIDNIGHT THROUGH A LITTLE
AFTER SUNRISE. WILL KEEP A SLIGHT CHANCE OF FREEZING DRIZZLE AFTER
MIDNIGHT AND WILL HAVE THE NEXT SHIFTS CONTINUE TO MONITOR THE
TRENDS.

WITH WINTER WEATHER IN THE FIRST PERIOD BEING THE MAJOR WEATHER
IMPACT FOR THIS FORECAST CYCLE… ONLY MADE MINOR ADJUSTMENTS TO
THE FORECAST IN THE LATER PERIODS.

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