[MCD] SWOMCD

Thu Aug 24 23:05:11 UTC 2006

ACUS11 KWNS 242303
SWOMCD
SPC MCD 242303 
WIZ000-IAZ000-MNZ000-SDZ000-NDZ000-250030-

MESOSCALE DISCUSSION 1875
NWS STORM PREDICTION CENTER NORMAN OK
0603 PM CDT THU AUG 24 2006

AREAS AFFECTED...SERN ND/NERN SD/SRN HALF OF MN/WRN WI/NERN IA

CONCERNING...TORNADO WATCH 743...744...

VALID 242303Z - 250030Z

THREAT FOR LARGE HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES
CONTINUES ACROSS WW 743 AND 744.

SURFACE LOW IS NOW INDICATED ACROSS N CENTRAL SD...WITH A WARM FRONT
EXTENDING ESEWD ACROSS SRN MN INTO SWRN WI...AND A COLD FRONT MOVING
SEWD ACROSS S CENTRAL SD AND NWRN NEB. AIRMASS INVOF THIS BOUNDARY
REMAINS VERY UNSTABLE...WITH 3000 TO 5000 J/KG MEAN-LAYER CAPE
INDICATED.  WITH STRONG DEEP-LAYER SHEAR AIDED BY 50 KT WSWLY FLOW
AT MID-LEVELS...EXPECT THREAT FOR SEVERE/SUPERCELL STORMS TO
CONTINUE.  LARGE HAIL HAS BEEN REPORTED WITH SEVERAL SUPERCELL
STORMS...EVEN WELL N OF THE WARM FRONT WHERE FAVORABLE DEEP-LAYER
SHEAR AND SUFFICIENT ELEVATED INSTABILITY EXISTS.  

MEANWHILE...GREATEST TORNADO THREAT EXISTS JUST E OF SURFACE
LOW...AND JUST TO THE COOL SIDE OF THE WARM FRONT -- FROM ERN SD
ESEWD INTO SRN WI.  WITH MODERATE ELY LOW-LEVEL FLOW JUST N OF THIS
FRONT...PRONOUNCED LOWER TROPOSPHERIC VEERING IS YIELDING WIND
PROFILES FAVORABLE FOR LOW-LEVEL ROTATION.  THIS COMBINED WITH VERY
MOIST LOW-LEVEL AIRMASS /SURFACE DEWPOINTS NEAR 70/ SUGGESTS THAT
THREAT FOR TORNADOES WILL CONTINUE -- AT LEAST FOR THE NEXT FEW
HOURS.

..GOSS.. 08/24/2006

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

ATTN...WFO...DLH...ARX...MPX...DMX...FGF...FSD...ABR...BIS...

47249805 46799608 44909115 42849110 44329605 44719916
46309932 

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