Looking for a handy, one-stop online shop for temperature and precipitation readings across Maryland or northern Virginia? Try the National Weather Service's Cooperative Observer Page at www.erh.noaa.gov/er/lwx/coop/ It provides the latest 24-hour readings for high and low temperatures, rain and snow accumulations. They're taken by trained volunteers - 11,000 of them nationwide -- and filed with the weather service to post online. Looks like they could use more help in metro Baltimore.