[MCD] SWOMCD

[MCD at goshenarc.org]

ACUS11 KWNS 181733
SWOMCD
SPC MCD 181733 
WIZ000-MNZ000-IAZ000-SDZ000-182130-

MESOSCALE DISCUSSION 0308
NWS STORM PREDICTION CENTER NORMAN OK
1133 AM CST FRI MAR 18 2005

AREAS AFFECTED...FAR ERN SD...SRN MN...AND WRN/CENTRAL WI

CONCERNING...HEAVY SNOW 

VALID 181733Z - 182130Z

HEAVY SNOW BAND EXTENDING FROM FAR ERN SD TO WRN WI WILL CONTINUE
THROUGH 00Z WITH SNOWFALL RATES OF 1-2"/HR EXPECTED. BAND WILL
SLOWLY SHIFT NWD/NEWD DURING THE NEXT 3-6 HOURS. 

CLOSED 700MB LOW CENTER OVER SERN SD WILL MOVE ONLY VERY SLOW EWD
ACROSS NWRN IA THROUGH 00Z...A PARTIAL RESULT OF THE HIGH LATITUDE
BLOCK ACROSS ERN CANADA. LOW-LEVEL BAROCLINIC ZONE IN ASSOCIATED
WITH THIS SYSTEM IS STRONG...WITH MARKED WARM FRONT EXTENDING FROM
SURFACE LOW NEAR SUX EWD ACROSS CENTRAL IA INTO N-CENTRAL IL. 

ON THE MESOSCALE...INTENSE PRECIPITATION BAND CONTINUES ON NRN EDGE
OF STRONG 850-700MB WARM ADVECTION ZONE. MODERATE TO HEAVY SNOW IS
OCCURRING AT A NUMBER OF ASOS STATIONS ACROSS SRN MN IN ASSOCIATION
WITH THIS BAND. WITH BAND WELL-ALIGNED WITH RUC 750MB FRONTOGENESIS
MAXIMUM...TREND SHOULD BE FOR BAND TO LIFT SLOWLY NEWD THROUGH
00Z...BRINGING SNOW RATES OF 1-2"/HR CLOSER TO THE SRN AND ERN
PORTIONS OF MSP METRO AREA. TRENDS SHOULD ALSO INCREASE ALONG I-94
CORRIDOR IN WRN WI. THE 12Z NAM INDICATES WELL-DEFINED
TROWAL/THETA-E RIDGE WRAPPING WWD JUST NORTH OF 700MB LOW CENTER
THROUGH 00Z AS LOW SLOWLY SHIFTS EWD ACROSS NRN IA. THIS FEATURE AND
ASSOCIATED ASCENT SHOULD MAINTAIN AXIS OF OCCASIONAL HEAVY SNOW
ACROSS FAR SRN/SWRN MN TO THE SD/MN BORDER COUNTIES THROUGH MOST OF
THE AFTERNOON.

..BANACOS.. 03/18/2005

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

ATTN...WFO...GRB...MKX...ARX...MPX...FSD...

44999311 44939158 44749031 44438956 43848969 43639032
43729289 43609449 43469555 43349639 43569708 44159725
44379650 44919458 

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