SWOMCD
SPC MCD 130027
OHZ000-KYZ000-INZ000-130200-
MESOSCALE DISCUSSION 1774
NWS STORM PREDICTION CENTER NORMAN OK
0727 PM CDT SAT JUL 12 2008
AREAS AFFECTED...ERN IL...IN...FAR WRN OH AND N CNTRL KY
CONCERNING...SEVERE THUNDERSTORM WATCH 689...
VALID 130027Z - 130200Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 689
CONTINUES.
THE THREAT FOR MAINLY ISOLATED SEVERE WIND GUSTS PERSISTS ACROSS THE
REMAINDER OF WATCH 689...INCLUDING MUCH OF CNTRL AND SRN
IN...PERHAPS EXTENDING TO JUST E OF THE WATCH INTO WRN OH AND NRN
KY.
SURFACE ANALYSIS SHOWS A WEAK TROUGH FROM NWRN OH SWWD ACROSS CNTRL
IN...JUST AHEAD OF AN OUTFLOW REINFORCED FRONTAL ZONE. MUCH OF SRN
IL...FAR SRN IN AND WRN KY HAS STABILIZED WITH PREFRONTAL
CONVECTION...THUS THE THREAT FOR SEVERE WIND GUSTS HAS LARGELY
DIMINISHED OVER THESE AREAS.
FARTHER NE INTO IN...A VERY UNSTABLE AIR MASS REMAINS. A MODEST
PRESSURE RISE/FALL COUPLET EXISTS WITH THE LINE OF STORMS MOVING E
OUT OF IL INTO IN...AND STRONG TO POSSIBLY SEVERE WINDS MAY
ACCOMPANY THESE STORMS. A SWLY LOW LEVEL JET AROUND 25 KT WILL
PERSIST THROUGH THE EVENING...HELPING TO MAINTAIN NEW DEVELOPMENT
ALONG THE LEADING LINE. HOWEVER...OVERALL INTENSITY IS EXPECTED TO
DECREASE WITH TIME AS THE BOUNDARY LAYER COOLS AND INSTABILITY
DECREASES.
..JEWELL.. 07/13/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ILN...LMK...IWX...IND...PAH...
37988579 37948697 38068707 38408712 38858715 39398654
40298554 40408390 39438414 38658455
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