Using the NH _ { 3 } ( 6,6 ) transition , which samples dense ( \sim 10 ^ { 5 } ) molecular gas with an energy above ground of 412 K , we find hot gas at high velocities ( –142 to –210 km s ^ { -1 } ) associated with the central 2 pc of the Galactic center . This material may be either infalling gas due to shocks or tidal stripping , or possibly gas swept from the nuclear region . We identify two high-velocity features , which we call the Southern Runner and the Cap , and correlate these features with others detected in various molecular observations of the Galactic center . The characteristic linewidths of the Southern Runner and Cap , 10 – 15 km s ^ { -1 } , are similar to those of other hot Galactic center clouds . The estimated H _ { 2 } masses of these clouds are 4 \times 10 ^ { 3 } M _ { \odot } and 2 \times 10 ^ { 3 } M _ { \odot } , consistent with the masses of the western streamer and northern ridge , NH _ { 3 } ( 6,6 ) emission features detected within the central 10 pc at lower velocities . Three possible explanations for this emission are discussed assuming that they lie at the Galactic center , including sweeping by the supernova remnant Sgr A East , infall and/or shock from the circumnuclear disk ( CND ) , and stripping from the central rotating low-velocity NH _ { 3 } ( 6,6 ) cloud .