Associated Press
This NOAA satellite image taken Thursday, Aug. 23, 2012 at 1:45 a.m. EDT shows Tropical Storm Isaac spinning over the eastern Caribbean Sea. The system is now about 265 miles southeast of San Juan, Puerto Rico with maximum winds up to 45 mph. A Hurricane Warning is in effect for Haiti and the Dominican Republic and a Tropical Storm Warning is in effect for most of the Caribbean Islands. The forecast storm track takes Isaac over Hispaniola and Cuba through the weekend.  To the north, a frontal boundary lingers over the Southeast and Gulf of Mexico and produces more heavy rains and strong thunderstorms. In the Plains, a trough of low pressure pushes a front through the Upper Midwest and kicks up some widespread thunderstorm activity.  A few of these storms may turn severe with strong winds and large hail.  (AP PHOTO/WEATHER UNDERGROUND)

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