During February and March 1988, a limited field experiment was conducted over the Gulf of Mexico to gather data on two phenomena: air mass modification over the Loop Current, and return flow characteristics of modified polar air returning to the southern shores of the United States. Six-hourly radiosondes, special Cross- Chain LORAN (Long-Range Aid to Navigation) Atmospheric Sounding System (CLASS) soundings, and three P-3 flights including dropwindsondes and Airborne Expendable Bathythermograph (AXBT) measurements were taken. The experiment objectives and the data are described.

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* NOAA/National Severe Storms Laboratory, Norman, OK 73069

NOAA/National Environmental Satellite and Data Information Service, Madison, WI 53706

Cooperative Institute for Meteorological Satellite Studies, Madison, WI 53706

§ Cooperative Institute for Mesoscale Meteorological Studies, Norman, OK 73019