MPA 00Z 500hPa height 1987 - - - - - - - - - - - 5392.8 1988 5371.8 5555.2 5532.1 5410.4 5436.9 5347.4 5405.2 5295.6 5380.0 5338.8 5350.0 5349.3 1989 5433.1 5493.2 5509.1 5331.6 5373.1 5342.8 5467.0 5416.1 5386.7 5415.4 5422.0 5407.3 1990 - 5569.1 5459.5 5280.4 5404.5 5313.7 5398.4 5273.7 5365.3 5340.0 5308.3 5377.3 1991 5523.8 5473.3 5430.8 5410.0 5314.3 5316.8 5366.0 5390.9 5383.2 5355.0 5372.7 5372.4 1992 5521.6 5431.0 5460.0 5507.6 5301.7 5327.1 5392.9 5380.0 5364.2 5330.4 5437.0 5476.7 1993 5368.3 5521.6 5471.9 5406.5 5373.3 5397.8 5321.8 5363.7 5377.9 5443.9 5430.4 5360.7 1994 5477.6 5407.2 5485.2 5407.6 5300.6 5339.1 5335.2 5369.2 5336.3 5338.1 5427.8 5402.9 1995 5489.6 5487.8 - 5511.5 5377.4 5217.8 5194.5 5252.4 - 5432.4 5405.7 5450.0 1996 5421.2 5464.4 5461.1 5406.3 5390.7 5323.3 5405.7 5345.5 5410.8 5386.9 5377.8 5484.4 1997 5473.2 5423.6 5531.9 5384.4 5455.9 5371.7 5293.7 5338.0 - - - - 1998 5397.8 5544.3 5483.2 5552.2 5486.5 5437.9 5277.8 5291.4 5353.6 5351.3 5414.7 5390.4 1999 5462.4 5419.5 5488.8 5510.4 5366.1 5344.3 5353.0 5360.0 5328.9 5402.0 5490.4 5425.5 2000 5447.2 5513.5 5469.6 5432.6 5471.5 5383.7 5347.6 5305.3 5353.6 5355.6 5362.3 5291.9 2001 5421.9 5391.2 5431.0 5367.9 5410.7 5331.4 5282.8 5396.0 5420.3 5506.1 5414.8 5473.9 2002 5483.8 5524.4 5389.7 5407.8 5309.6 5299.2 5359.7 5417.9 5394.1 5304.3 5337.5 5456.8 2003 5385.2 5483.6 5467.0 5465.0 5429.0 5283.4 5344.8 5401.2 5387.8 5360.3 5322.1 5371.9 2004 5506.0 5614.3 5506.5 5375.6 5443.0 5347.7 5340.3 5387.5 5313.8 5397.9 5491.5 5432.0 2005 5403.5 5588.5 5459.3 5392.5 5324.0 5338.6 5376.5 5363.1 5465.0 5394.3 5377.3 5411.6 2006 5466.6 5534.6 5455.0 5417.7 5476.9 5363.3 5319.0 5338.7 5341.4 5413.5 5371.5 5400.7 2007 5462.9 5409.3 5437.7 5343.6 5431.8 - - - 5463.0 5360.0 5313.8 5440.7 2008 5484.0 5526.4 5521.5 5313.9 5405.9 5363.1 5360.0 5284.2 5495.4 5406.7 5350.0 5489.6 2009 5479.6 5442.3 5447.0 5350.4 5304.0 5350.4 5313.5 5316.4 5394.8 5340.0 5272.8 5416.0 2010 5395.6 5404.2 5477.8 5420.0 5414.1 5340.5 5361.5 5366.9 5376.0 5449.6 5463.5 5344.5 2011 5477.9 5573.0 5478.6 5357.7 5410.4 5334.1 5321.7 5349.6 5370.0 5423.7 5444.6 5536.7 2012 5511.7 5402.5 5476.1 5382.1 5368.6 5234.4 5252.7 5449.7 5389.2 5338.3 5404.3 5345.8 2013 5512.4 5467.7 5522.5 5535.0 5340.4 5284.5 5335.4 5286.4 5423.2 5411.9 5359.6 5345.0 2014 5369.7 5471.8 5407.6 5468.2 5396.7 5368.2 5386.9 5363.7 5373.2 5387.9 5376.8 5380.0 2015 5446.0 5476.3 5493.3 5438.1 5409.7 5268.5 5283.3 5341.2 5298.3 5437.2 5418.9 5390.0 2016 5454.2 5461.5 5537.2 5410.0 5533.3 5468.6 5391.4 5333.3 5500.8 5461.0 5392.1 5383.8 2017 5398.6 5545.8 5513.0 5436.4 5450.0 5269.6 5348.3 5354.7 5383.9 5327.0 5381.4 5390.4 2018 5461.7 5530.8 5437.0 5371.8 5402.6 5330.3 5393.2 5377.1 5370.4 5370.3 5411.3 5465.7 2019 5392.3 5421.1 5512.3 5402.8 5368.8 5362.4 5365.2 5340.3 5336.6 5409.6 5385.0 5402.5 2020 5417.0 5504.3 5544.5 5499.2 5432.5 5335.6 5332.0 5307.0 5347.1 5410.0 - 5427.0 2021 - 5546.2 5504.4 5530.0 5448.0 5446.0 - 5344.7 5440.7 5365.6 5432.0 5549.2 2022 5490.0 - - 5373.3 5418.9 5368.3 5292.9 5374.3 5448.2 5447.1 5515.4 5478.2 2023 5526.0 5510.8 5406.4 5398.0 5370.6 5342.8 5359.5 5298.2 5350.0 5318.9 5364.4 5429.4 2024 5498.8 5546.9 5406.5 5394.3 - - - - - - - -