A few NASA stations cover the hourly data: 3/1978–6/1993: Automated Weather System (AWS): 747945; 7/1993–12/2005: AWS: 747946; 5/2005–Present: Cooperative Station ID (COOPID): 088947.
NCDC Hourly Maps are now consolidated on a single website, with multiple layers. Hourly Data can be accessed by clicking on time-related maps and selecting Hourly/Sub-Hourly data:Hourly Data
http://gis.ncdc.noaa.gov/map/viewer/#app=cdo