MESO: Mesoscale Discussion 2483

ACUS11 KWNS 190038
SWOMCD
SPC MCD 190037
IAZ000-MNZ000-NEZ000-SDZ000-190530-

MESOSCALE DISCUSSION 2483
NWS STORM PREDICTION CENTER NORMAN OK
0637 PM CST THU DEC 18 2008

AREAS AFFECTED...NERN QUARTER OF NEB/SERN SD/SWRN MN/NWRN QUARTER OF
IA

CONCERNING...HEAVY SNOW

VALID 190037Z - 190530Z

SNOW IS FORECAST TO INCREASE OVER THE NEXT FEW HOURS AND SPREAD NEWD
ACROSS THE DISCUSSION AREA WITH TIME. SNOWFALL RATES OF 1"/HR ARE
EXPECTED...WITH RATES POSSIBLY REACHING 2"/HR LATER IN THE PERIOD
OVER PORTIONS OF THE ERN HALF OF THE DISCUSSION AREA.

A MID-LEVEL SHORT-WAVE TROUGH/VORT MAX -- NOW ENTERING THE CENTRAL
HIGH PLAINS -- IS FORECAST TO TRAVERSE THE CENTRAL PLAINS REGION
OVER THE NEXT 6-9 HOURS. STRONG ASCENT IS INDICATED AHEAD OF THIS
FEATURE -- PARTICULARLY OVER WRN AND CENTRAL NEB ATTM...N OF A WARM
FRONT CURRENTLY EXTENDING FROM A SURFACE LOW OVER E CENTRAL CO
ROUGHLY E-W ACROSS SRN KS.

FREEZING RAIN IS CURRENTLY INDICATED ACROSS MOST OF NRN KS AND NWRN
MO...WITH A MIXED PRECIPITATION/SNOW LINE INDICATED ACROSS SRN NEB.
WHILE WARM ADVECTION MAY RESULT IN SOME NWD SHIFT OF THIS LINE...IT
APPEARS ATTM THAT PRECIPITATION SHOULD REMAIN PRIMARILY IN THE FORM
OF SNOW N OF ROUGHLY I-80.

ALONG WITH WIDESPREAD SNOWFALL RATES OF 1"/HR EXPECTED...RATES MAY
LOCALLY/OCCASIONALLY EXCEED 2"/HR...WITH EVENING RAOBS SUGGESTING --
AND CURRENT OBSERVATIONS CONFIRMING -- EMBEDDED LIGHTNING WITHIN AN
INCREASINGLY-EXPANSIVE PRECIPITATION SHIELD.

..GOSS.. 12/19/2008

...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...MPX...DMX...FSD...OAX...GID...LBF...UNR...

LAT...LON 44099469 42819386 41749461 41509651 41029898 42059994
43389938 44239803 44489624 44099469

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