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ACUS11 KWNS 252330
SWOMCD
SPC MCD 252329
WIZ000-IAZ000-MNZ000-SDZ000-260130-
Mesoscale Discussion 0523
NWS Storm Prediction Center Norman OK
0629 PM CDT Fri May 25 2018
Areas affected...Iowa...far southwest Wisconsin...and extreme
northwest Illinois
Concerning...Severe potential...Watch unlikely
Valid 252329Z - 260130Z
Probability of Watch Issuance...5 percent
SUMMARY...Thunderstorms are developing/ongoing from central Iowa
northeast into southwest Wisconsin and will continue to move
south-southeast this evening. Additional thunderstorms may develop
to the southwest of these thunderstorms, across portions of central
into southwest Iowa. Although hail and gusty winds may be possible
at times with the strongest thunderstorms, the overall severe threat
will remain too limited for an additional watch.
DISCUSSION...Thunderstorms across northeast Iowa and southwest
Wisconsin have congealed into a small mesoscale cluster. Although
individual cells are moving generally east, general propagation of
the overall cluster will be more south-southeast, into the
instability axis that stretches from central Iowa northeast into
southern Wisconsin.
Southwest of this cluster, additional, more discrete, thunderstorms
are developing within a weak confluent zone extending from southwest
Iowa into northeast Iowa that is coincident with the previously
mentioned instability axis.
Within both regimes, thunderstorms may pose a brief hail and gusty
wind threat, but the pending loss of diurnal heating and lack of
large-scale ascent or deep-layer shear will result in an overall
weakening trend the next few hours. A new watch will not be required
south or east of existing WW 120.
..Marsh/Grams.. 05/25/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GRB...MKX...DVN...DLH...ARX...MPX...DMX...FSD...
ABR...
LAT...LON 44589717 45609388 46289221 45988891 43088946 42479088
42699520 43449837 44589717
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