Whitlock 00Z pressure 1982 - 956.9 945.8 948.5 954.7 948.1 957.3 943.0 943.7 948.3 952.5 964.1 1983 963.5 963.9 953.6 948.8 953.3 955.1 948.6 945.8 950.8 936.9 942.7 955.8 1984 965.5 958.3 948.6 948.7 955.8 947.4 943.5 952.4 948.8 940.3 947.9 963.4 1985 962.0 955.3 953.8 953.8 - 950.5 940.1 951.1 941.8 942.3 940.3 950.4 1986 958.8 963.3 960.2 950.1 958.3 957.9 949.0 951.2 945.9 941.9 944.6 952.3 1987 964.4 958.2 955.0 957.6 952.0 954.8 960.0 942.1 955.8 947.3 947.4 956.4 1988 960.2 954.6 954.8 952.7 958.8 962.0 945.7 943.4 951.9 957.9 950.6 953.2 1989 955.7 954.1 952.7 956.1 940.6 949.1 947.5 951.3 952.0 943.8 944.4 959.2 1990 959.2 950.7 954.1 961.3 965.4 956.6 965.4 948.9 941.1 949.7 953.0 954.3 1991 953.3 958.7 950.0 956.1 955.3 958.3 958.5 951.8 948.2 946.3 951.3 963.8 1992 - - - - - - - - - - - - 1993 - - - - - 977.5 - - - - - - 1994 - - - - - - - - - - - - 1995 953.8 954.9 963.9 956.6 953.5 961.9 973.0 960.1 951.5 953.1 951.9 952.6 1996 960.3 964.0 957.5 953.1 959.3 955.5 956.4 - 962.9 945.9 961.2 959.6 1997 962.3 962.7 952.6 959.3 947.3 960.0 - - - - 960.2 964.5 1998 959.5 954.3 955.8 - - - - - - - - - 1999 - - - - - - - - - - - - 2000 - - - - - - - - - - - - 2001 - - 956.9 951.2 956.4 953.3 958.6 953.7 951.5 944.8 949.1 949.6 2002 956.3 950.7 962.0 953.1 962.7 965.0 960.1 950.1 958.0 961.4 955.8 951.4 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -