A remarkable example of gravity wave propagation over the southeastern United States on Dec. 3, 1968, is described. The wave developed within the cold air north of a quasi-stationary front along the coast of the Gulf of Mexico in apparent response to convective activity associated with a weak cyclonic disturbance on the front. The wave maintained its identity for 14 hr while propagating east-southeastward at 13 m/s in a direction nearly opposite to the low-level flow. Gravity-wave-related pressure drops exceeded 7 mb over an average period of 1 hr. Strong and gusty winds blowing perpendicularly to the isobars toward lower pressure accompanied the wave-related pressure fall. Precipitation of several hours duration ceased abruptly with the wave passage, along with increases in the ceiling and horizontal visibility. Comparison is made with results from other papers dealing with wave propagation along frontal surfaces.