A severe thunderstorm watch was issued for Jasper and Newton counties in Indiana and Ford and Iroquois counties in Illinois until 7 p.m.
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Scattered showers became more numerous during the late morning and were expected to continue into the early afternoon, as a cold front sweeps across the area, meteorologist Greg Dutra said.
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There is a chance some storms could become severe in northwest Indiana; the main threat would be high winds, but a brief tornado cannot be ruled out, Dutra said.
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If severe storms do occur, they will quickly exit the area.
Much cooler air is behind the front, with highs almost 20 degrees cooler than normal.