MESO: Mesoscale Discussion 2133

ACUS11 KWNS 081525
SWOMCD
SPC MCD 081524
NDZ000-MTZ000-081930-

MESOSCALE DISCUSSION 2133
NWS STORM PREDICTION CENTER NORMAN OK
0924 AM CST SAT DEC 08 2012

AREAS AFFECTED...ERN MT AND WRN ND

CONCERNING...HEAVY SNOW

VALID 081524Z - 081930Z

SUMMARY...A TRANSIENT THREAT OF HEAVY SNOW IS EXPECTED THIS MORNING
AND AFTERNOON AS A SNOW BAND PIVOTS ESEWD THROUGH ERN MT AND WRN ND.
INCH AN HOUR RATES WILL BE POSSIBLE...THOUGH THE DURATION OF HEAVY
SNOW MAY BE LIMITED DUE TO MIGRATORY NATURE OF THE ONGOING BAND.

DISCUSSION...THE APPROACH OF A COMPACT SHORT WAVE TROUGH /NOTED ON
WV IMAGERY OVER CNTRL MT AS OF 15Z/ IS INFLUENCING 850-700 MB
FRONTOGENESIS. AS SUCH...INCREASING UPWARD MOTION OWING TO FAVORABLE
JUXTAPOSITION OF LOW-LEVEL CONVERGENCE AND UPPER-LEVEL DIVERGENCE
WILL LIKELY MAINTAIN AN ONGOING SNOW BAND ACROSS NERN MT. LOW-LEVEL
SATURATION EVIDENCED ON THE 12Z GGW SOUNDING WILL SUPPORT INCH AN
HOUR RATES FOR AREAS BENEATH THE BAND. AS THE UPPER TROUGH
PROGRESSES SEWD WITH A SUBSEQUENT LOW-LEVEL MASS RESPONSE /DEEPENING
SURFACE PRESSURE/...THE BAND IS EXPECTED TO PIVOT SSEWD THROUGH THE
AFTERNOON...BECOMING FOCUSED EAST OF THE MCD AREA THEREAFTER. AS
THIS OCCURS...COLDER/DRIER AIR ADVECTING INTO THE REGION WILL LEAD
TO A CESSATION OF HEAVIER RATES FOR THE MCD AREA LATE THIS AFTERNOON
INTO THE EVENING.

..DISPIGNA.. 12/08/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...BIS...BYZ...GGW...

LAT...LON 47470758 48120589 48200321 47710193 47450164 46850202
46430239 45950427 45610556 45560692 45730760 46590769
47470758

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