The @NWSIndianapolis has already received reports of visibilities of less than 1/8th of a mile from the White River valley, including the South Street Bridge in Lafayette over the Wabash River. A Dense Fog Advisory is in place for all of central Indiana until 10am Thursday.
The Weather Service notes that in addition to the usual tendencies for #fog to be at its most dense in river valleys, etc., valleys with river ice present will contribute to even worse visibility near rivers/on bridges, etc. as the air is efficiently cooled to its dewpoint…
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