In 1941 the North American Regional Broadcasting Agreement shifted WNYC's frequency a second time, to 830 kHz. WCCO was moved to 830 as well, and was given clear-channel authority. WNYC would remain a 1,000-watt outlet for the next 48 years. Later that year, on December 7, WNYC was the first radio station in the United States to announce the Japanese attack on Pearl Harbor. Beginning during World War II, the FCC allowed WNYC to stay on the air 6AM to 10PM (in addition to its normal daylight hours) due to the public service it was providing.