Whitlock 12Z pressure 1982 - 957.0 946.3 948.4 954.6 947.8 956.7 943.0 943.7 948.2 952.5 964.3 1983 963.2 963.9 953.3 948.9 953.2 955.7 947.9 945.7 950.0 936.7 942.5 955.3 1984 965.3 957.9 948.5 949.0 955.7 947.7 942.9 952.0 948.4 940.5 948.3 963.4 1985 961.8 955.5 953.8 952.9 - 950.7 939.7 951.3 941.1 942.7 940.7 950.1 1986 958.3 963.8 959.6 949.7 958.0 958.6 948.5 951.0 945.6 941.8 944.3 952.0 1987 964.5 957.9 955.1 957.2 951.5 954.8 960.5 942.1 956.1 947.2 947.7 956.6 1988 960.0 954.4 953.8 952.8 958.5 962.3 945.2 943.9 952.8 958.3 950.2 952.9 1989 955.5 953.9 953.0 955.3 940.6 948.9 947.5 952.3 951.2 944.0 944.2 959.4 1990 959.5 951.3 954.5 960.8 965.9 955.6 964.5 949.0 940.6 949.7 952.7 954.5 1991 953.1 958.7 950.3 955.4 955.7 958.5 959.9 950.6 948.8 945.9 952.2 963.8 1992 - - - - - - - - - - - - 1993 969.3 952.0 958.9 955.7 - - - - - 949.8 - - 1994 - - - - - - - - - - - - 1995 954.1 954.8 963.8 956.1 953.4 962.1 973.5 959.5 950.8 953.1 952.2 952.2 1996 960.0 963.8 957.5 952.0 959.3 955.1 956.1 - - 945.9 961.0 959.6 1997 962.5 961.5 953.1 958.5 947.2 960.0 - - - - 960.1 964.4 1998 959.5 954.5 955.8 - - - - - - - - - 1999 - - - - - - - - - - - - 2000 - - - - - - - - - - - - 2001 - - 956.8 951.0 957.1 953.5 959.0 953.8 951.1 944.5 948.7 949.9 2002 956.1 950.7 961.9 952.6 963.2 964.9 960.1 949.7 957.8 961.2 955.2 951.4 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -