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Using H I absorption spectra taken from the recent surveys of 21-cm line andcontinuum emission in the Galactic plane, the distribution of cool atomicclouds in the outer disk of the Milky Way is revealed. The warp of the midplaneis clearly seen in absorption, as it is in emission, and the cool, neutralmedium also shows flaring or increase in scale height with radius similar tothat of the warm atomic hydrogen. The mixture of phases, as measured by thefraction of H I in the cool clouds relative to the total atomic hydrogen, staysnearly constant from the solar circle out to about 25 kpc radius. Assuming coolphase temperature ~50 K this indicates a mixing ratio of 15% to 20% cool H I,with the rest warm.

Where Does the Disk Turn Into the Halo? Cool H I in the Outer Milky Way Disk