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Wednesday, June 12, 2013

NOAA's National Weather Service SPC Tornado/Severe Thunderstorm Watches Update

06/12/2013 05:03 AM EDT

Public Severe Weather Outlook
  PUBLIC SEVERE WEATHER OUTLOOK 
 
NWS STORM PREDICTION CENTER NORMAN OK 
0402 AM CDT WED JUN 12 2013 
 
...SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF THE 
UPPER MIDWEST  INTO THE OHIO VALLEY THIS AFTERNOON 
AND TONIGHT... 
 
THE NWS STORM PREDICTION CENTER IN NORMAN OK IS 
FORECASTING THE  DEVELOPMENT OF WIDESPREAD DAMAGING 
WINDS...LARGE HAIL AND A FEW  TORNADOES OVER PARTS OF 
THE UPPER MIDWEST INTO THE OHIO VALLEY THIS  AFTERNOON 
AND TONIGHT. 
 
THE AREAS MOST LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE 
  • EASTERN IOWA 
  • NORTHERN AND CENTRAL ILLINOIS 
  • MUCH OF INDIANA 
  • WESTERN OHIO
    
    
 
ELSEWHERE... 
SEVERE STORMS ARE ALSO POSSIBLE IN SURROUNDING  AREAS...
INCLUDING PARTS OF THE MIDDLE MISSISSIPPI VALLEY...
SOUTHERN  GREAT LAKES...CENTRAL APPALACHIANS AND MID 
ATLANTIC COAST  STATES...AS WELL AS ACROSS PARTS OF THE 
NORTHERN ROCKIES INTO  ADJACENT HIGH PLAINS. 
 
THE ENVIRONMENT IS BECOMING VERY MOIST AND UNSTABLE ALONG 
A STALLED  FRONTAL ZONE EXTENDING FROM THE MID ATLANTIC 
COAST WEST  NORTHWESTWARD THROUGH THE OHIO VALLEY...
TO A DEVELOPING AREA OF LOW  PRESSURE ACROSS THE MIDDLE 
MISSOURI VALLEY.  THIS LOW IS EXPECTED TO  BECOME THE 
FOCUS FOR INTENSE THUNDERSTORM DEVELOPMENT AS IT TRACKS 
EASTWARD ACROSS EASTERN IOWA INTO NORTHERN ILLINOIS THIS 
AFTERNOON...
 
WHERE CONDITIONS LIKELY WILL BECOME CONDUCIVE TO THE 
EVOLUTION OF A LARGE AND ORGANIZED CLUSTER OF STORMS. 
THIS ACTIVITY  IS THEN EXPECTED TO SPREAD RAPIDLY EAST 
SOUTHEASTWARD ACROSS  SOUTHERN PORTIONS OF THE GREAT LAKES 
REGION...AND SOUTHWARD TOWARD  THE LOWER OHIO VALLEY....
LATE THIS AFTERNOON AND EVENING. 
 
WIDESPREAD STRONG...POTENTIALLY DAMAGING...WIND GUSTS ARE  
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