Schwerdtfeger 00Z pressure 1985 - 986.7 984.4 985.3 - 981.8 972.7 982.5 974.0 974.6 970.8 979.6 1986 987.6 992.7 991.0 980.6 993.5 990.6 980.4 982.5 978.5 973.1 976.1 982.1 1987 992.4 988.8 987.0 988.1 983.9 987.8 992.9 975.9 988.6 979.8 978.4 985.3 1988 988.4 984.1 986.8 983.5 990.2 996.4 975.9 976.4 983.6 989.7 981.6 982.6 1989 984.5 986.1 984.2 988.5 971.5 980.6 979.7 983.3 984.4 974.5 975.4 988.5 1990 988.6 982.2 985.6 992.0 997.1 988.4 997.8 - 972.6 981.7 983.0 983.9 1991 982.0 988.8 981.8 986.5 987.3 990.2 - 983.4 980.1 978.6 982.9 994.7 1992 987.8 996.0 988.0 985.0 990.7 994.6 982.1 - - - - - 1993 - 977.7 984.0 979.5 980.9 976.6 969.1 - - 958.7 962.5 966.2 1994 967.7 965.9 960.9 967.5 966.8 981.2 971.9 - - - - - 1995 - - - - - - - - - - - - 1996 - 990.3 984.6 977.2 983.9 981.5 980.9 987.3 987.1 970.5 985.6 983.1 1997 985.5 987.5 976.6 981.7 969.9 983.7 975.4 974.0 977.8 974.1 984.1 987.4 1998 982.1 977.3 978.1 970.9 979.0 972.6 976.1 975.0 984.3 976.1 970.1 978.2 1999 979.6 984.0 981.5 978.1 974.4 995.6 975.8 980.0 978.5 961.0 967.9 970.8 2000 975.1 979.8 980.1 980.0 979.7 981.8 977.4 980.0 985.2 971.8 977.7 992.6 2001 988.2 984.4 981.3 975.7 981.3 978.7 982.7 979.2 975.1 968.9 972.6 973.4 2002 980.1 974.5 986.7 977.6 988.4 990.9 984.4 974.6 982.4 985.4 980.0 975.2 2003 - - - - - - - - - - - - 2004 - - - - - - - 978.1 - - - - 2005 - 973.7 - 974.6 975.1 984.4 976.6 972.0 - 967.6 974.7 990.5 2006 981.6 - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -