Ferrell 12Z pressure 1981 - 987.7 989.7 991.6 985.0 979.2 987.0 995.5 988.9 980.8 977.1 978.5 1982 989.7 986.5 978.1 980.2 986.8 979.7 989.4 975.6 976.2 980.1 984.5 994.5 1983 991.8 994.7 984.9 979.4 985.4 989.1 981.2 - - - - - 1984 993.8 988.9 979.4 980.3 987.9 980.9 975.8 985.6 980.9 - - - 1985 - 988.8 987.1 987.3 - - 975.7 986.3 975.5 977.1 - - 1986 - 993.6 991.6 981.3 992.5 992.3 981.2 984.5 979.5 974.2 975.9 981.4 1987 - 988.6 987.8 989.9 984.0 988.8 993.9 976.1 989.6 980.2 979.3 986.0 1988 988.7 985.5 986.3 984.7 990.9 995.7 978.1 976.3 985.3 990.8 981.9 982.4 1989 984.8 985.6 984.8 989.1 - - - - - 975.7 976.0 988.9 1990 988.3 983.1 987.1 993.7 1000.1 989.4 999.1 982.7 974.1 983.1 984.8 984.9 1991 983.7 989.9 983.7 988.2 989.4 992.5 - - - - 984.9 995.3 1992 988.9 997.8 988.4 987.3 992.7 997.3 984.8 - - - - - 1993 - 977.7 985.6 981.3 983.2 976.1 972.1 978.2 977.0 976.1 979.1 982.3 1994 983.8 982.5 978.4 985.4 985.2 998.8 989.1 975.1 989.6 977.4 983.9 980.2 1995 980.2 980.8 990.7 983.4 981.0 988.5 1001.7 986.3 977.6 979.9 977.5 977.2 1996 985.4 990.3 985.1 978.6 985.9 982.2 982.4 987.8 989.5 971.8 986.7 984.9 1997 988.4 989.0 980.1 985.9 973.3 987.7 980.2 978.0 980.9 976.7 986.8 990.1 1998 985.3 980.7 982.2 976.1 982.7 977.5 980.9 - - - - - 1999 - 987.4 - - - - - - - - - - 2000 985.1 - - - - - - - - - - - 2001 - 988.2 985.7 979.3 985.6 982.3 987.6 984.1 979.1 972.4 976.0 976.5 2002 983.2 977.9 990.4 981.2 992.3 995.3 989.6 979.2 986.9 989.9 983.4 978.7 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - 978.7 982.9 2007 986.3 983.0 989.9 984.7 986.6 986.4 996.9 979.2 978.3 982.4 981.8 975.7 2008 979.9 979.9 984.8 985.6 983.7 977.3 980.4 982.9 972.0 974.1 - - 2009 - - - - - - - - - - - -