581  
ACUS01 KWNS 181601  
SWODY1  
SPC AC 181600  
 
DAY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
1100 AM CDT TUE SEP 18 2018  
 
VALID 181630Z - 191200Z  
 
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER PARTS OF  
THE UPPER MIDWEST...  
   
..SUMMARY
 
 
ISOLATED HAIL AND DAMAGING WIND GUSTS ARE POSSIBLE TODAY OVER PARTS  
OF THE UPPER MIDWEST.  
   
..NE/IA/IL
 
 
A PERSISTENT CLUSTER OF THUNDERSTORMS IS AFFECTING MUCH OF NORTHERN  
IA AND ADJACENT REGIONS THIS MORNING, WITH THE LEADING-EDGE OUTFLOW  
SURGING SOUTHWARD ACROSS EASTERN IA. MUCH OF THIS REGION HAS BEEN  
STABILIZED BY THE CONVECTION, LEAVING A CORRIDOR FROM EASTERN NE  
INTO NORTHWEST IL WHERE SUFFICIENT HEATING IS POSSIBLE LATER TODAY.  
THIS AXIS MAY SEE STORM INTENSIFICATION BY MID/LATE AFTERNOON, WITH  
THE STRONGEST CELLS CAPABLE OF HAIL OR LOCALLY DAMAGING WIND GUSTS.  
PRESENT INDICATIONS ARE THAT THE SEVERE RISK WILL REMAIN ISOLATED  
AND MARGINAL IN NATURE.  
 
..HART/DARROW.. 09/18/2018  
 

 
 
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