AREAS AFFECTED...NRN MO...CNTRL AND NRN IL INTO NWRN IND
CONCERNING...SEVERE THUNDERSTORM WATCH 235...236...
VALID 040716Z - 040915Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
235...236...CONTINUES.
SUMMARY...A HAIL...WIND...AND HEAVY RAIN THREAT WILL PERSIST ACROSS
NRN MO WITH A DECREASING OVERALL THREAT INTO IL. A FEW SEVERE STORMS
WILL BE POSSIBLE OVER NWRN IND.
DISCUSSION...A SMALL MCS CONTINUES TO MOVE EWD ACROSS N CNTRL
IL...AND WILL CROSS INTO INDIANA SOON. TRAILING SWWD FROM THIS
FORWARD PROPAGATING CLUSTER IS A PRONOUNCED OUTFLOW BOUNDARY WHICH
CONTINUES TO SURGE SWD ACROSS CNTRL IL. WHILE A WIND THREAT WILL
EXIST OVER NWRN IND...THE SEVERE THREAT SHOULD BE DIMINISHING TO THE
W. UNLESS ELEVATED HAIL CORES BECOME SEVERE...NRN AND ERN PORTIONS
OF THE WATCH COULD BE CANCELLED EARLY.
OVER WRN PARTS OF THE WATCH...NEW ACTIVITY WAS DEVELOPING ACROSS
SERN IA/FAR WRN IL...WHICH MAY POSE SOME THREAT MAINLY ALONG AND S
OF THE OUTFLOW FROM THE PREVIOUS CONVECTION.
TO THE W OVER NRN MO...STRONG SWLY WARM FLOW CONTINUE TO FEED A VERY
MOIST AND UNSTABLE AIR MASS INTO EXISTING CLUSTERS OF STORMS...WITH
CONTINUOUS CORES FORMING OVER WRN PORTIONS OF THE BOUNDARY. HAIL AND
GUSTY WINDS WILL BE LIKELY ALONG WITH HEAVY RAIN. WITH VEERING 850
MB FLOW AND MARGINAL FLOW ALOFT...THESE CELL CLUSTERS MAY GUST OUT
ONCE THEY REACH A CRITICAL SIZE AND OUTFLOW SURGES OUT FROM UNDER
THEM.
..JEWELL.. 05/04/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IWX...IND...LOT...ILX...LSX...DVN...DMX...EAX...
OAX...
LAT...LON 41578891 41448709 41238656 40838654 40428719 39958980
39459273 39509422 40129537 40629560 40779508 41309102
41578891
