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Weather. things are heating up in the northern and central. to the east people are bracing for a big storm. the system moving through could bring showers and thunderstorms along with the threat of flash flooding. meteorologist, janet dean is live with more. whats happening? >> summertime thunderstorms. we have got the heat across the central u.s. and the southeast. then this dip in the jetstream which is allowing these storms to ride along it and bring the potential for heavy downpours as well a...