SWOMCD
SPC MCD 180716
MNZ000-IAZ000-180815-
MESOSCALE DISCUSSION 1857
NWS STORM PREDICTION CENTER NORMAN OK
0216 AM CDT SAT SEP 18 2010
AREAS AFFECTED...WCNTRL-NERN IA...EXTREME SERN MN AND SWRN WI
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 180716Z - 180815Z
...HAIL THREAT INCREASING--MOSTLY IN WCNTRL-NCNTRL IA...
LEFT-MOVING MEMBER OF AN ELEVATED SUPERCELL SPLIT OVER EXTREME NERN
NEB HAS HAD A HISTORY OF HAIL TO THE SIZE OF GOLF BALLS. THIS
CELL...AND ADDITIONAL STORMS...WILL INCREASE ALONG/N OF A SECONDARY
FRONTAL SURGE ACROSS WCNTRL-NERN IA AND SWRN WI EARLY THIS MORNING.
THE MOST UNSTABLE PARCELS WILL CONTINUE TO EXIST OVER AREAS FROM
CNTRL/WRN IA SWWD INTO NEB...PLACING PARTS OF NWRN/NCNTRL IA ALONG
THE NRN GRADIENT OF SEVERE HAIL PROBABILITIES...JUST OUTSIDE OF
SEVERE THUNDERSTORM WATCH 671.
FARTHER TO THE NE...TOWARD NERN IA AND SWRN WI...STORMS MAY PRODUCE
SUB-SEVERE HAIL...BUT PARCEL TRAJECTORIES SUGGEST THAT MORE ROBUST
ACTIVITY SHOULD BE RELEGATED WEST OF THE REGION.
..RACY.. 09/18/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ARX...DMX...FSD...
LAT...LON 42359626 43669158 42769189 42229444 42359626
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