MESOSCALE DISCUSSION 1310
   NWS STORM PREDICTION CENTER NORMAN OK
   0140 AM CDT MON JUN 20 2011
   
   AREAS AFFECTED...MUCH OF CENTRAL INTO SOUTH CENTRAL IA
   
   CONCERNING...TORNADO WATCH 516...
   
   VALID 200640Z - 200715Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 516 CONTINUES.
   
   AT 0625Z...REGIONAL RADAR IMAGERY SHOWED A CLUSTER OF STORMS
   EXTENDING FROM MONROE THROUGH APPANOOSE TO WAYNE COUNTIES IA...WITH
   THIS ACTIVITY EXPECTED TO EXIT WW 516 INTO WW 519 BY 07Z. 
   ADDITIONAL STORMS WILL BE POSSIBLE WITHIN THE REMAINDER OF WW 516
   BEYOND THE SCHEDULED EXPIRATION OF 07Z...HOWEVER...TRENDS SUGGEST
   THAT THE CENTRAL PART OF IA SHOULD REMAIN WITHIN A RELATIVELY LOWER
   PROBABILITY FOR SEVERE STORMS IN THE SHORT TERM GIVEN THIS AIR MASS
   HAS BEEN OVERTURNED CONVECTIVELY.
   
   MEANWHILE...INCREASING LOW LEVEL WAA PER OBJECTIVE ANALYSES ACROSS
   SRN NEB/NRN KS ALONG THE NOSE OF A STRENGTHENING SLY LLJ EXTENDING
   INTO THIS REGION SHOULD SUPPORT A FURTHER INCREASE IN AREAL COVERAGE
   ACROSS NEB.  THIS ACTIVITY IS FORECAST TO SPREAD INTO IA LATER
   TONIGHT AS THE LLJ VEERS TO SWLY TOWARD 12Z...WHICH COULD RESULT IN
   A NEW WATCH IF THIS SCENARIO UNFOLDS PER SHORT TERM MODELS.
   
   ..PETERS.. 06/20/2011
   
   
   ATTN...WFO...DVN...DMX...EAX...FSD...OAX...
   
   LAT...LON   42219563 42299227 41289246 40609268 40559532 41189508
               41899515 41879561 42219563