...PLEASE SEE WWW.SPC.NOAA.GOV/ FOR GRAPHIC PRODUCT...
NNNN
ZCZC SPCSWOMCD ALL
ACUS11 KWNS 311838
SPC MCD 311838
NEZ000-IAZ000-312200-

SPC MESOSCALE DISCUSSION 0081 FOR ERN NEB AND WRN IA
CONCERNING...HEAVY SNOW...

A MESOSCALE BAND OF HEAVY SNOW LOCATED AT 1830Z FROM 25 S
HSI TO 20
SW SUX WILL PROPAGATE EWD TOWARD EXTREME ERN NEB AND
WRN/CENTRAL IA
THROUGH 01/00Z. LOCALIZED SNOW RATES OF 1-2 IN/HR ARE
ANTICIPATED
WITH THIS FEATURE.

IR SATELLITE IMAGERY INDICATES A MID-LEVEL DEFORMATION ZONE
ACROSS
CENTRAL NEB IN ASSOCIATION WITH 500MB TROUGH LIFTING NEWD
ACROSS KS
AND DEVELOPING SURFACE CYCLONE ALONG THE SURFACE BAROCLINIC
ZONE IN
CENTRAL AR. VAD WINDS IN VICINITY OF NEB INDICATE THE
DEFORMATION
ZONE IS LOCATED BETWEEN 2-3 KM...AND IS ASSOCIATED WITH
PRONOUNCED
FRONTOGENESIS FORCING. THIS IS RESULTING IN AN INCREASE IN
BANDED
PRECIPITATION ORGANIZATION AND INTENSITY AND REPORTS OF
HEAVY SNOW
AT GRI AND HSI. AS THE UPPER TROUGH LIFTS NEWD...THE
DEFORMATION
ZONE AND ASSOCIATED FRONTOGENESIS FORCING IS EXPECTED TO
PROPAGATE
ENEWD AND EXTEND NE-SW ACROSS CENTRAL IA AND DSM VICINITY
AROUND
01/00Z. MESOSCALE BAND WIDTH WILL LIKELY REMAIN RATHER
NARROW...AND
IS CURRENTLY BETWEEN 20-30 NM WIDE...AND RESULT IN A SHORT
DURATION
OF HEAVY SNOW...EMBEDDED WITHIN LIGHT TO MODERATE SNOW
ACROSS ERN
NEB AND WRN IA THROUGH THE AFTERNOON AND EARLY EVENING
HOURS.

..BANACOS.. 01/31/02