SWOMCD
SPC MCD 300649
MNZ000-NDZ000-301045-
MESOSCALE DISCUSSION 2548
NWS STORM PREDICTION CENTER NORMAN OK
1249 AM CST TUE DEC 30 2008
AREAS AFFECTED...CNTRL AND SE ND/WEST CNTRL MN
CONCERNING...HEAVY SNOW
VALID 300649Z - 301045Z
SNOW RATES BETWEEN 1 AND 2 INCHES PER HOUR WILL BE POSSIBLE OVER
CENTRAL AND SOUTHEAST NORTH DAKOTA AND WEST CENTRAL MINNESOTA FOR
THE NEXT SEVERAL HOURS.
A STRONG SHORTWAVE TROUGH CENTERED OVER CENTRAL MT AT 06Z WILL
CONTINUE TO MOVE EASTWARD INTO NORTH DAKOTA OVER THE NEXT SEVERAL
HOURS...WITH AN ASSOCIATED REGION OF STRONG VORTICITY ADVECTION AND
IMPRESSIVE VERTICAL MOTION AHEAD OF IT. NOSE OF MID-LEVEL 120 KT
SPEED MAX WILL ROTATE AROUND THE BASE OF THE TROUGH INTO WESTERN
SOUTH DAKOTA BY 12Z...PLACING NORTH DAKOTA UNDERNEATH A FAVORABLE
LEFT-EXIT REGION OF THE JET AND ENHANCED VERTICAL MOTION...ENHANCING
IMPRESSIVE ISENTROPIC LIFT OF MOISTURE /.5 INCH PW VALUES NOTED ON
00Z RAP SOUNDING/ AHEAD OF THE SYSTEM. GREATEST SNOWFALL RATES WILL
BE LOCATED IN AN ELONGATED NARROW REGION OF STRONG MID-LEVEL
FRONTOGENESIS THAT MODELS ARE FORECASTING TO RAPIDLY MOVE
EAST-SOUTHEASTWARD FROM CNTRL ND AT 06Z INTO MN BY 09Z...SO
LOCALIZED HEAVY SNOWFALL RATES ABOVE AN INCH PER HOUR SHOULD NOT
LAST LONGER THAN 2 TO 3 HOURS.
..LEVIT.. 12/30/2008
...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...DLH...MPX...FGF...BIS...
LAT...LON 47880080 47920191 47840222 47280245 46750140 46379949
46159795 46029634 45909464 46339435 46649464 47239720
47479839 47739997 47880080
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