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The first official day of summer has arrived, and for many cities, it has felt like it for weeks.
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Tuesday marks another day of dangerous heat and humidity for the Plains and Midwest, spreading into the Southeast.
Many record-high temperatures will be broken on Tuesday and Wednesday.
Strong-to-severe thunderstorms will be possible over the Midwest and the interior Northeast, down into the mid-Atlantic on Wednesday.
Heavy rain could cause flash flooding in isolated areas.
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As the monsoon season begins in the Southwest, wet weather is forecast, but too much of a good thing will also bring the risk of flooding.