NWS said North winds are expecting to increase to 35 mph on Monday and then shift to the northwest Monday night and waves are expected to build to 12 feet.
The NWS said the worst times for conditions are expected Monday morning through Tuesday afternoon.
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Flooding and beach erosion are possible along the Lake Michigan shoreline in northwest Indiana, NWS said.
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Freezing spray will also be possible Monday night.
Residents on or near the shore should take action to protect property and listen for later statements or warnings.