This NOAA satellite image taken Saturday, Aug. 04, 2012 at 01:45 AM EDT shows a low pressure system over the Upper Midwest and central Canada with its cold front extending southwestward across the Central Plains and into the Four Corners. Showers and thunderstorms are developing along the frontal boundary. Some heavy showers and strong thunderstorms are noted over portions of the Upper Midwest. (AP Photo/Weather Underground)

Associated Press
This NOAA satellite image taken Saturday, Aug. 04, 2012 at 01:45 AM EDT shows a low pressure system over the Upper Midwest and central Canada with its cold front extending southwestward across the Central Plains and into the Four Corners. Showers and thunderstorms are developing along the frontal boundary. Some heavy showers and strong thunderstorms are noted over portions of the Upper Midwest.  (AP Photo/Weather Underground)
This NOAA satellite image taken Saturday, Aug. 04, 2012 at 01:45 AM EDT shows a low pressure system over the Upper Midwest and central Canada with its cold front extending southwestward across the Central Plains and into the Four Corners. Showers and thunderstorms are developing along the frontal boundary. Some heavy showers and strong thunderstorms are noted over portions of the Upper Midwest. (AP Photo/Weather Underground)
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