On all nightKLWW radio in Cedar Rapids has begun operating 24 hours a day, with the exception of a three-hour period on Sunday nights.It becomes the second station in the city to go to all-night programming.However, KLWW has the distinction of being the first in Cedar Rapids and one of the few stations in the Midwest to operate its newsroom continuously around-the-clock. KLWW offers local and regional as well as national news-each hour throughout the night. Most 24 hour stations rely strictly on teletype reports of national news for the newscasts during the midnight to 5 a.m. period.Because some of its staff is presently on vacation, KLWW is following a temporary schedule. It will release derails of the times when its various announcers are featured at a later date.KLWW programs con tern porary music and is owned by the Blackhawk Broadcasting Co., of Waterloo. Donald Wier is local manager.