Midwest Chasing

URGENT - IMMEDIATE BROADCAST REQUESTED  
SEVERE THUNDERSTORM WATCH NUMBER 536  
NWS STORM PREDICTION CENTER NORMAN OK  
730 PM CDT WED JUL 18 2007  

THE NWS STORM PREDICTION CENTER HAS ISSUED A  
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF   

       NORTHERN ILLINOIS  
       NORTHERN INDIANA  
       SOUTHERN LOWER MICHIGAN  
       LAKE MICHIGAN  

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 730 PM  
UNTIL 300 AM CDT.  

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70  
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.  

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60  
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST  
SOUTHWEST OF MEIGS FIELD ILLINOIS TO 20 MILES EAST NORTHEAST OF  
FORT WAYNE INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE  
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).  

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE  
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH  
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR  
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS  
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY  
DO PRODUCE TORNADOES.  

OTHER WATCH INFORMATION...CONTINUE...WW 529...WW 531...WW  
532...WW 533...WW 534...WW 535...  

DISCUSSION...TSTMS/POSSIBLE EMBEDDED SUPERCELLS EXPECTED TO  
CONTINUING DEVELOPING E/SE ALONG WARM ADVECTION WING ASSOCIATED WITH  
ERN IA MCS.  SUFFICIENT SHEAR AND LOW LEVEL MOISTURE ARE PRESENT FOR  
A BRIEF TORNADO OR TWO...BUT EXPECTED QUASI-LINEAR STORM MODE AND  
EVENTUAL ARRIVAL OF FORWARD-PROPAGATING/BOWING PART OF IA SYSTEM  
EXPECTED TO KEEP WIND/HAIL THE PRIMARY SVR THREATS.