SWOMCD
SPC MCD 061140 COR
MOZ000-KSZ000-IAZ000-NEZ000-SDZ000-061445-
MESOSCALE DISCUSSION 2184
NWS STORM PREDICTION CENTER NORMAN OK
0540 AM CST THU DEC 06 2007
AREAS AFFECTED...ERN NEB/FAR SWRN IA/NERN-EAST CENTRAL KS AND
ADJACENT PART OF MO
CONCERNING...WINTER MIXED PRECIPITATION
VALID 061140Z - 061445Z
CORRECTED TO CLARIFY NWD EXTENT OF FREEZING RAIN THREAT
SNOWFALL RATES UP TO 1 IN/HR ARE EXPECTED TO DEVELOP ACROSS ERN NEB
FROM HOLT TO YORK/FILLMORE COUNTIES BETWEEN 12-15Z AND INTO FAR ERN
NEB/FAR SWRN IA INCLUDING THE OMAHA METRO AREA BETWEEN 15-18Z.
FARTHER S...THERMODYNAMIC PROFILES PER FORECAST SOUNDINGS INDICATE A
WARM LAYER IN THE LOW LEVELS WILL SUPPORT A MIXTURE OF SLEET/
FREEZING RAIN ACROSS MAINLY EAST CENTRAL KS AND ADJACENT PARTS OF
WEST CENTRAL MO...GENERALLY S OF THE I-70 CORRIDOR...BY 18Z.
AT 10Z...REGIONAL RADARS INDICATED AN AREA OF PRECIPITATION MAINLY
IN THE FORM OF LIGHT SNOW ACROSS CENTRAL NEB AND A MIXTURE OF PTYPES
INTO NORTH CENTRAL NEB. WINTRY PRECIPITATION IS EXPECTED TO EXPAND
IN AREAL COVERAGE AND INCREASE IN INTENSITY ACROSS ERN NEB/NERN KS
THIS MORNING. THIS WILL OCCUR AS ASCENT WITHIN LEFT EXIT REGION OF
WLY MID/UPPER LEVEL JETS ACCOMPANYING CENTRAL ROCKIES SHORT WAVE
TROUGH DEVELOPS EWD INTO THE CENTRAL PLAINS. THIS ASCENT WILL BE
ENHANCED BY INCREASING WAA REGIME ALONG AXIS OF STRONG SSWLY LLJ
EXTENDING INTO ERN NEB BY LATE MORNING. ALTHOUGH ONGOING
PRECIPITATION BEGAN AS A MIXTURE OF WINTER PTYPES...THE EXPECTED
INCREASE OF UVVS WILL SUPPORT SUFFICIENT COOLING IN THE COLUMN FOR
THE PTYPE TO BE MAINLY SNOW ACROSS ERN NEB TO NWRN MO WHERE SNOWFALL
RATES SHOULD APPROACH 1 IN/HR BY MID-LATE MORNING. GIVEN THE
POTENTIAL FOR STRONG UVVS TO EXTEND SWD...FREEZING RAIN RATES S OF
I-70 CORRIDOR MAY REACH FROM 0.05 TO 0.1 IN/HR FOR A FEW HOURS ONCE
PRECIPITATION BEGINS AROUND 15-18Z.
.PETERS.. 12/06/2007
..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...EAX...FSD...OAX...TOP...ICT...GID...LBF...
41519553 40759525 40109524 39789494 39309461 38359450
38139500 38219598 38699728 39569786 40539782 41409809
42189852 42719872 42919833 42769696 42359641 41779612
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