MESOSCALE DISCUSSION 0879
   NWS STORM PREDICTION CENTER NORMAN OK
   0201 AM CDT SUN MAY 11 2008
   
   AREAS AFFECTED...CENTRAL/SOUTHERN IL INTO INDIANA
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 110701Z - 110830Z
   
   CORRECTED FOR AREAS AFFECTED HEADER
   
   AT LEAST AN ISOLATED SEVERE HAIL/DAMAGING WIND THREAT WILL EXIST
   OVERNIGHT ACROSS PORTIONS OF CENTRAL/SOUTHERN IL INTO INDIANA. A
   WATCH COULD BE NEEDED IF INCREASING CONVECTIVE TRENDS OCCUR.
   
   UPPER LOW CONTINUES TO GRADUALLY CLOSE OFF/MATURE ACROSS MO/IL INTO
   WESTERN IL PER WATER VAPOR IMAGERY...WITH DEEPENING 991 MB SURFACE
   LOW CENTERED NEAR THE MO/IL/IL BORDER AREA AS OF 06Z...AND OCCLUDING
   SURFACE BOUNDARY TO THE SOUTH. IN SPITE OF MODEST INSTABILITY /500 J
   PER KG OF MUCAPE/ WITH NORTH EXTENT ACROSS CENTRAL/SOUTHERN IL AHEAD
   OF THE CYCLONE...CONCERN EXISTS FOR A SEMI-ORGANIZED SEVERE THREAT
   OWING TO THE DEEPENING OF THE UPPER LOW...STRONG KINEMATICS/WIND
   FIELDS...AND STEEP MID LEVEL LAPSE RATES. A FORCED LINE OF STRONG
   CONVECTION CONTINUES TO ADVANCE EASTWARD ACROSS CENTRAL IL BETWEEN
   THE PEORIA/SPRINGFIELD AREAS AS OF 0645Z. WITH POTENTIAL FOR SEVERE
   HAIL/DAMAGING WINDS THROUGH THE OVERNIGHT...WILL CLOSELY MONITOR
   CONVECTIVE TRENDS FOR THE POSSIBILITY OF A WATCH.
   
   ..GUYER.. 05/11/2008
   
   
   ATTN...WFO...LMK...IWX...IND...PAH...LOT...ILX...LSX...
   
   40739004 41008944 41158827 40638682 39498652 37958705
   37888830 38098928 38908958