ACUS11 KWNS 140322
SWOMCD
MESOSCALE DISCUSSION 1404
NWS STORM PREDICTION CENTER NORMAN OK
1022 PM CDT MON JUL 13 2015
AREAS AFFECTED...E-CNTRL AND NERN IL...MUCH OF CNTRL/NRN INDIANA
CONCERNING...TORNADO WATCH 413...417...
VALID 140322Z - 140415Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 413...417...CONTINUES.
SUMMARY...SVR POTENTIAL REMAINS RELATIVELY HIGHEST OVER CNTRL
INDIANA...WHILE BECOMING INCREASINGLY ISOLATED ACROSS NRN IL...WITH
DMGG WINDS THE PRIMARY THREAT. THE SVR THREAT ASSOCIATED WITH AN
ONGOING LINE OF TSTMS APPROACHING THE CHICAGO METRO AREA MAY
CONTINUE PAST TORNADO WATCH 417 EXPIRATION TIME OF 04Z...AND A LOCAL
EXTENSION IN TIME MAY BE CONSIDERED.
DISCUSSION...CLUSTERS OF STRONG TO POTENTIALLY SVR STORMS ARE
ONGOING ACROSS CNTRL INDIANA ALONG THE ERN PERIPHERY OF PLUME OF
RICHEST LOW-LEVEL MOISTURE /LOWER-MID 70S DEWPOINTS/. STORMS HAVE
FAILED TO CONGEAL INTO AN ORGANIZED LINE THUS FAR...BUT NEW TSTM
DEVELOPMENT AIDED BY A MODEST INCREASE IN A WLY LLJ COULD SUPPORT
EVENTUAL UPSCALE GROWTH ACROSS PARTS OF TORNADO WATCH 417. IN THE
MEANTIME...DMGG WIND THREAT SHOULD REMAIN DOMINANT BUT RELATIVELY
ISOLATED...WITH LOWER/MORE SPORADIC POTENTIAL FOR HAIL AND POSSIBLY
A BRIEF TORNADO.
ACROSS TORNADO WATCH 417 IN NRN/CNTRL IL...MOST CONVECTION HAS
WEAKENED OR MOVED E OF THE AREA. ONE EXCEPTION IS A PERSISTING LINE
OF STORMS AFFECTING THE CHICAGO METRO AREA EXTENDING WWD INTO DEKALB
COUNTY...EXHIBITING THE POTENTIAL FOR STRONG WINDS AND HAIL. THE SVR
THREAT ASSOCIATED WITH THESE STORMS COULD PERSIST PAST WATCH
EXPIRATION TIME OF 04Z ACROSS NERN IL...AND A LOCAL EXTENSION IN
TIME COULD BE CONSIDERED FOR PARTS OF WATCH 417.
..ROGERS.. 07/14/2015
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IWX...IND...LOT...ILX...
LAT...LON 41058493 39688534 39018579 38888659 38738736 40498859
41918906 42348907 42468854 42428798 41898683 41668497
41058493
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