In Muskegon, Michigan, the Weather Bureau predicted only that the day would be “fair and colder.” In Chicago, the iconic weather map at the Board of Trade went blank. The codes—which were technically voluntary but diligently policed—limited newspapers to publishing official Weather Bureau forecasts and then only for areas within 150 miles of its base. “You can’t censor weather,” one Weather Bureau staffer scoffed to a syndicated-news reporter. Across the country, doctors who had depended on accurate atmospheric pressure readings from the Weather Bureau to run certain tests were advised to acquire their own barometers. Still, confidence in Weather Bureau forecasts tumbled.