  We report that neutral hydrogen (HI) gas clouds, resembling High Velocity
Clouds (HVCs) observed in the Milky Way (MW), appear in MW-sized disk galaxies
formed in high-resolution Lambda Cold Dark Matter (LCDM) cosmological
simulations which include gas-dynamics, radiative cooling, star formation,
supernova feedback, and metal enrichment. Two such disk galaxies are analyzed,
and HI column density and velocity distributions in all-sky Aitoff projections
are constructed. The simulations demonstrate that LCDM is able to create
galaxies with sufficient numbers of anomalous velocity gas clouds consistent
with the HVCs observed within the MW, and that they are found within a
galactocentric radius of 150 kpc. We also find that one of the galaxies has a
polar gas ring, with radius 30 kpc, which appears as a large structure of HVCs
in the Aitoff projection. Such large structures may share an origin similar to
extended HVCs observed in the MW, such as Complex C.
