TY - CPAPER AU - M.E. McIntyre BT - Seminar on the Nature and Prediction of Extra Tropical Weather Systems. 7-11 September 1987 CY - Shinfield Park, Reading DA - 1987 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 1987 SP - 237 EP - 260 T2 - Seminar on the Nature and Prediction of Extra Tropical Weather Systems. 7-11 September 1987 TI - The dynamical significance of isentropic distributions of potential vorticity and low-level distributions of potential temperature VL - I ER -