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Predicting signals in experiments to directly detect dark matter (DM)requires a form for the local DM velocity distribution. Hitherto, the standardhalo model (SHM), in which velocities are isotropic and follow a truncatedGaussian law, has performed this job. New data, however, suggest that asubstantial fraction of our stellar halo lies in a strongly radiallyanisotropic population, the 'Gaia Sausage'. Inspired by this recent discovery,we introduce an updated DM halo model, the SHM$^{++}$, which includes a`Sausage' component, thus better describing the known features of our galaxy.The SHM$^{++}$ is a simple analytic model with five parameters: the circularspeed, local escape speed and local DM density, which we update to beconsistent with the latest data, and two new parameters: the anisotropy and thedensity of DM in the Sausage. The impact of the SHM$^{++}$ on signal models forWIMPs and axions is rather modest since the multiple changes and updates havecompeting effects. The largest change occurs for directional detectors whichhave sensitivity to the full three-dimensional velocity distribution.

SHM$^{++}$: A Refinement of the Standard Halo Model for Dark Matter Searches in Light of the Gaia Sausage