SWOMCD
SPC MCD 121230
OKZ000-KSZ000-121630-
MESOSCALE DISCUSSION 2213
NWS STORM PREDICTION CENTER NORMAN OK
0630 AM CST WED DEC 12 2007
AREAS AFFECTED...WRN AND NRN OK
CONCERNING...FREEZING RAIN
VALID 121230Z - 121630Z
A MIXTURE OF FREEZING RAIN AND SLEET WILL BE LIKELY WITH SHOWERS
MOVING NEWD ACROSS WRN AND NRN OK THIS MORNING. PRECIPITATION RATES
COULD REACH A TENTH OF AN INCH PER HOUR WITH THE HEAVIER SHOWERS.
THE LATEST WATER VAPOR IMAGERY SHOWS AN UPPER-LEVEL LOW OVER SE AZ
WITH SOUTHWEST FLOW IN PLACE ACROSS THE SRN PLAINS. A PLUME OF
MID-LEVEL MOISTURE EXTENDS NNEWD ACROSS WCNTRL TX INTO SRN OK
ASSOCIATED WITH A BAND OF STRONG FLOW IN THE 700 TO 500 MB LAYER.
THIS IS LIKELY WHERE WARM ADVECTION IS OCCURRING WHICH COMBINED WITH
STEEP MID-LEVEL LAPSE RATES SHOULD CONTINUE TO SUPPORT
CONVECTIVE-TYPE SHOWERS ACROSS WRN AND NRN OK THIS MORNING. FREEZING
RAIN AND SLEET WILL BE LIKELY WITH AREAS IN THE PATH OF THE HEAVIER
SHOWERS RECEIVING PRECIPITATION RATES UP TO A TENTH OF AN INCH PER
HOUR. THE FREEZING LINE SHOULD GRADUALLY MOVE NWWD THIS MORNING
ALLOWING FOR A CHANGEOVER TO RAIN IN THE SERN FRINGE OF THE MD AREA.
.BROYLES.. 12/12/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
..NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
ATTN...WFO...TSA...ICT...OUN...
35439764 35009846 34619956 34769999 35399994 36269843
36949753 37049699 36969664 36719645 36399650 36009683
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