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The James Webb Space Telescope (JWST) is expected to observe galaxies at$z>10$ that are presently inaccessible. Here, we use a self-consistentempirical model, the UniverseMachine, to generate mock galaxy catalogues andlightcones over the redshift range $z=0-15$. These data include realisticgalaxy properties (stellar masses, star formation rates, and UV luminosities),galaxy-halo relationships, and galaxy-galaxy clustering. Mock observables arealso provided for different model parameters spanning observationaluncertainties at $z<10$. We predict that Cycle 1 JWST surveys will very likelydetect galaxies with $M_*>10^7 M_\odot$ and/or $M_{1500}<-17$ out to at least$z\sim 13.5$. Number density uncertainties at $z>12$ expand dramatically, soefforts to detect $z>12$ galaxies will provide the most valuable constraints ongalaxy formation models. The faint-end slopes of the stellar mass/luminosityfunctions at a given mass/luminosity threshold steepen as redshift increases.This is because observable galaxies are hosted by haloes in the exponentiallyfalling regime of the halo mass function at high redshifts. Hence, thesefaint-end slopes are robustly predicted to become shallower below currentobservable limits ($M_\ast < 10^7M_\odot$ or $M_\mathrm{1500}>-17$). Forreionization models, extrapolating luminosity functions with a constantfaint-end slope from $M_{1500}=-17$ down to $M_{1500}=-12$ gives the mostreasonable upper limit for the total UV luminosity and cosmic star formationrate up to $z\sim 12$. We compare to three other empirical models and onesemi-analytic model, showing that the range of predicted observables from ourapproach encompasses predictions from other techniques. Public catalogues andlightcones for common fields are available online.

The Universe at z>10: Predictions for JWST from the UniverseMachine DR1