Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 202223
SWOMCD
SPC MCD 202223
WIZ000-IAZ000-MNZ000-202330-

MESOSCALE DISCUSSION 1745
NWS STORM PREDICTION CENTER NORMAN OK
0523 PM CDT SAT SEP 20 2014

AREAS AFFECTED...SOUTHERN MN...SWRN WI

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 202223Z - 202330Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...SEVERE TSTM WATCH WILL LIKELY BE ISSUED SOON TO ACCOUNT
FOR FAST-MOVING CONVECTION THAT WILL SPREAD ACROSS SRN MN INTO SWRN
WI.

DISCUSSION...STRONGLY FORCED BAND OF CONVECTION HAS GRADUALLY
ORGANIZED ACROSS MN...IMMEDIATELY AHEAD OF DIGGING MID-LEVEL
VORT...ALONG A SURGING COLD FRONT. NUMEROUS MEASURED WIND GUSTS AOA
40KT ARE OBSERVED ALONG THIS LINE WITH 49KT RECENTLY MEASURED AT
KRWF.  THIS ACTIVITY IS SPREADING SEWD AT ROUGHLY 40-45KT AND WILL
SOON EXIT WATCH.  ADDITIONALLY...A FEW PRE-FRONTAL SUPERCELLS HAVE
EVOLVED OVER BLUE EARTH AND LE SUEUR COUNTIES IN SRN MN.  THESE MORE
DISCRETE STRUCTURES SHOULD BE OVERTAKEN BY FRONTAL CONVECTION SOON.
DAMAGING WINDS ARE THE PRIMARY THREAT...THOUGH LARGE HAIL IS
EXPECTED WITH AFOREMENTIONED SUPERCELLS.

..DARROW/CORFIDI.. 09/20/2014

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

ATTN...WFO...ARX...MPX...DMX...

LAT...LON   43989484 45079352 44349056 43099068 43029192 43989484




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