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NORRISTOWN, Pa. (CBS)–Based on a review of forecasts from the National Weather Service, the Montgomery County Commissioners have declared a Cold Blue Cold Weather Emergency for Montgomery County.

The Code Blue Declaration begins at 8:00 p.m. Tuesday night and lasts until 12:00 p.m. on Wednesday.

Cold Blue Cold Weather Declarations are made when weather poses a threat of serious harm to those without shelter.  It is declared when the combination of air temperature and wind chill is expected to be 20 degrees or less.

For more info, visit the Montgomery County Health Department website: http://www.montcopa.org/index.aspx?nid=572.

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