Ferrell 00Z pressure 1981 - 988.0 990.2 - 985.2 978.1 987.2 995.5 988.5 981.0 977.1 978.6 1982 990.2 986.9 977.7 980.3 986.7 980.6 989.1 975.1 977.0 980.2 984.4 994.8 1983 992.4 995.1 985.4 979.5 986.2 989.4 981.4 - - - - - 1984 994.3 989.6 979.4 979.8 987.6 980.9 976.2 - 980.8 - - - 1985 - 988.8 987.2 988.2 - - 975.9 985.9 976.8 976.8 - - 1986 - 993.4 992.7 981.8 992.2 991.8 981.7 984.2 979.8 974.4 976.5 982.3 1987 - 989.0 988.0 989.8 984.7 988.5 993.5 976.8 989.3 980.6 - 985.9 1988 989.2 985.6 987.3 984.5 990.9 995.6 - 975.9 984.4 990.5 - 982.7 1989 985.0 986.1 985.0 - - - - - - 975.7 975.7 989.2 1990 988.9 983.1 987.3 993.8 998.6 989.7 999.7 982.6 974.8 983.1 984.9 984.8 1991 983.8 990.0 983.6 988.9 989.1 992.2 - - - - 984.4 995.7 1992 989.2 997.8 988.7 987.1 993.5 996.3 984.5 - - - - - 1993 - 978.5 985.7 981.7 982.8 977.1 971.9 978.6 976.6 976.3 979.1 982.6 1994 984.4 983.0 978.9 985.8 985.1 998.5 989.6 975.0 989.3 977.9 983.9 980.1 1995 980.0 981.3 991.1 983.7 981.4 988.2 1001.1 986.6 978.5 979.8 977.3 977.5 1996 985.9 990.4 985.6 978.9 985.7 982.9 982.6 987.3 989.5 972.5 987.1 985.2 1997 988.5 990.0 980.4 986.3 973.7 987.6 979.8 977.7 981.3 977.2 986.8 990.5 1998 985.6 980.6 982.3 976.6 982.9 977.5 980.7 - - - - - 1999 - 987.3 - - - - - - - - - - 2000 - - - - - - - - - - - - 2001 - 988.3 985.6 980.1 985.0 982.3 986.8 983.4 979.6 972.6 976.3 976.3 2002 983.4 978.0 990.4 981.6 991.9 995.0 989.3 979.3 986.5 989.7 983.8 978.8 2003 990.5 989.6 985.6 978.6 977.5 993.3 979.8 978.5 979.9 973.8 982.1 993.2 2004 984.9 995.3 985.5 979.3 982.7 979.9 979.3 983.0 983.1 980.2 976.1 990.2 2005 986.3 979.2 984.1 980.3 980.5 989.8 982.3 977.8 978.0 972.4 979.6 994.8 2006 986.1 985.1 986.1 988.3 977.7 981.5 978.3 990.6 983.0 976.3 978.7 983.3 2007 986.1 983.3 989.8 984.9 987.3 985.5 997.1 979.6 978.1 982.2 981.7 975.8 2008 980.1 979.9 984.8 985.9 984.0 976.8 980.4 982.7 972.5 973.9 978.3 980.2 2009 980.8 985.9 982.6 982.9 990.5 990.1 990.9 988.3 983.4 977.0 981.8 981.9 2010 995.3 990.1 984.6 980.7 982.8 977.2 969.4 974.0 980.7 975.1 973.6 988.0 2011 990.7 985.0 989.8 988.4 978.3 986.6 983.8 987.0 988.8 978.3 985.5 976.0 2012 977.4 984.1 983.1 981.5 979.0 991.4 979.7 983.1 979.5 977.7 987.8 - 2013 986.7 978.8 976.0 983.6 983.2 994.1 980.3 990.1 989.9 982.1 979.1 984.2 2014 - - 982.9 980.4 982.9 981.6 983.7 973.0 - - - - 2015 - 976.6 982.6 980.7 984.8 984.3 975.8 976.5 974.8 978.0 975.2 985.0 2016 978.2 980.4 978.8 984.4 983.6 977.5 987.5 989.1 971.5 978.8 990.9 987.2 2017 991.8 988.0 988.6 981.6 976.4 980.8 978.4 974.7 977.8 980.7 975.1 983.2 2018 982.9 982.1 983.2 987.2 984.1 986.2 983.6 990.1 973.7 971.8 975.5 980.2 2019 984.6 986.8 984.6 981.7 984.8 972.3 987.0 981.9 971.9 981.1 990.6 993.2 2020 990.0 982.1 978.5 982.2 979.0 977.2 982.8 984.7 983.5 971.9 975.9 975.7 2021 979.9 978.0 986.0 980.8 983.1 981.8 987.4 988.8 974.7 979.1 974.3 973.0 2022 982.1 979.6 981.2 981.7 978.0 990.8 975.5 977.7 974.0 979.3 975.5 976.3 2023 977.3 983.2 985.4 992.0 981.1 988.0 984.8 986.8 978.9 975.6 981.4 977.6 2024 980.7 984.1 982.2 974.6 976.2 975.3 989.5 992.0 985.1 - - -