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We study fluctuations in a vertically oscillated layer of grains below thecritical acceleration for the onset of ordered standing waves. As onset isapproached, transient disordered waves with a characteristic length scaleemerge and increase in power and coherence. The scaling behavior and the shiftin the onset of order agrees with the Swift-Hohenberg theory for convection influids. However, the noise in the granular system is four orders of magnitudelarger than the thermal noise in a convecting fluid, making the effect ofgranular noise observable even 20% below the onset of long range order.Comment: 4 pages, 4 figures, submitted to PR

Noise, Coherent Fluctuations, and the Onset of Order in an Oscillated Granular Fluid