The First International Satellite Land Surface Climatology Project (ISLSCP) Field Experiment (FIFE) was initiated partly to improve our ability to model spatial distributions of surface-atmospheric fluxes over hilly prairie. Monin-Obukhov similarity was used to calculate sensible heat fluxes (Hc) at an array of ten FIFE flux measurement sites for comparison with measured sensible heat fluxes (Hm). Data were collected within the dynamic sublayer on a clear morning when there was strong solar heating of the surface, winds in excess of 5 m s-1, and uniformly wet soil conditions. The sensitivity of correlations between Hc and Hm to spatial variability of air (Ta) and aircraft-based (thermal infrared multispectral scanner (TIMS)) remotely sensed surface (Tr) temperatures, wind speed (u), and an atmospheric stability parameterization (&psgr;h) was examined. Hc was found to depend on the spatial variability of Tr and u but not on Ta and &psgr;h. Furthermore, approximately half the discrepancy between Hc and Hm may be attributed to uncertainty in Hm. ¿ American Geophysical Union 1996