863
ACUS11 KWNS 162129
SWOMCD
SPC MCD 162128
MIZ000-INZ000-162230-
MESOSCALE DISCUSSION 1690
NWS STORM PREDICTION CENTER NORMAN OK
0428 PM CDT WED JUL 16 2025
AREAS AFFECTED...NORTHERN INDIANA...FAR SOUTHERN MICHIGAN
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 162128Z - 162230Z
PROBABILITY OF WATCH ISSUANCE...60 PERCENT
SUMMARY...A LINE OF THUNDERSTORMS WITH A HISTORY OF PRODUCING SEVERE
WINDS WILL MOVE DOWNSTREAM OF WW518. A NEW WATCH MAY BE NEEDED TO
COVER THIS THREAT.
DISCUSSION...A FAST MOVING LINE OF THUNDERSTORMS CONTINUES EASTWARD
MOVING OUT OF EASTERN ILLINOIS NEAR SOUTHERN LAKE MICHIGAN INTO
NORTHERN INDIANA. THIS LINE HAS A HISTORY OF PRODUCING GUSTS 50-65
MPH. THE ENVIRONMENT DOWNSTREAM REMAINS FAVORABLY UNSTABLE AND WARM,
THOUGH DEEP LAYER SHEAR PROFILES ARE MEAGER. A NEW WATCH DOWNSTREAM
OF WW518 MAY BE WARRANTED TO COVER THE RISK DOWNSTREAM.
..THORNTON.. 07/16/2025
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...IWX...GRR...IND...LOT...
LAT...LON 41268734 42108712 42428671 42618622 42638581 42478546
42248517 41738492 41398492 40848495 40458506 40348557
40258605 40298656 40338706 40458744 41268734
MOST PROBABLE PEAK WIND GUST...55-70 MPH
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