ZCZC SPCSWOMCD ALL
ACUS11 KWNS 252329 
SPC MCD 252329 
WIZ000-ILZ000-IAZ000-MNZ000-260100-

Mesoscale Discussion 1159
NWS Storm Prediction Center Norman OK
0629 PM CDT Wed Jul 25 2018

Areas affected...Northern Iowa...Southeast Minnesota...and most of
Wisconsin.

Concerning...Severe Thunderstorm Watch 308...

Valid 252329Z - 260100Z

The severe weather threat for Severe Thunderstorm Watch 308
continues.

SUMMARY...The threat of large hail and damaging winds persists in
watch 308. The best chance for severe weather is in south central
Minnesota and north central Iowa.

DISCUSSION...Numerous storms have developed within watch 308. Most
of these storms have struggled to maintain strength, likely due to
limited buoyancy attributed to cloud cover across much of the
eastern portion of the watch. Storm intensity has been greater in
western portions of the watch where instability is greater. One
particular storm produced hail up to 2.75 inches in southern
Minnesota. This supercell has since weakened due to storm mergers in
northern Iowa. However, given a similar environment ahead of this
line of storms, the hail threat continues. In addition, these storms
may congeal and pose an increasing wind threat through the evening.

Further east, a loss of daytime heating, and cloud cover will limit
any further destabilization. Current MLCAPE around 1000 J/kg and
effective shear around 40 knots may support some strong to severe
storms for the next few hours, but the severe threat will likely not
be as great as further west.

..Bentley.. 07/25/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...GRB...MKX...DVN...DLH...ARX...MPX...DMX...FSD...

LAT...LON   43639523 44099486 44269463 44869310 45229217 45429080
            45688991 45528897 45108853 44538833 43888832 43478850
            43068936 42599032 42339112 42249222 42159309 42179392
            42249479 43639523 

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