TY - GEN AU - H. PĆ¼mpel BT - ECMWF Technical Memoranda CY - Shinfield Park, Reading DA - 08/1981 DO - 10.21957/2qx6262k9 LA - eng M1 - 36 PB - ECMWF PP - Shinfield Park, Reading PY - 1981 EP - 8 T2 - ECMWF Technical Memoranda TI - Maximum vorticity and maximum tendency charts: Two tools to identify areas of cyclonic activity in a medium range forecast UR - https://www.ecmwf.int/node/11766 ER -