MPA 00Z 850hPa height 1987 - - - - - - - - - - - 1337.8 1988 1311.3 1415.5 1380.2 1352.8 1373.2 1330.5 1374.3 1324.4 1362.8 1333.5 1294.3 1288.2 1989 1330.6 1360.1 1392.0 1292.2 1353.0 1313.4 1408.6 1399.2 1394.4 1358.3 1333.9 1313.3 1990 - 1413.8 1360.7 1279.1 1365.2 1300.5 1357.4 1280.6 1360.6 1306.5 1273.3 1315.5 1991 1381.0 1362.1 1321.6 1343.1 1284.4 1341.8 1341.6 1384.2 1358.4 1336.9 1321.2 1306.4 1992 1382.7 1336.7 1349.3 1383.0 1301.1 1349.3 1386.4 1375.6 1342.7 1293.3 1376.9 1373.4 1993 1320.6 1393.4 1359.7 1347.1 1322.1 1360.0 1337.4 1340.6 1359.7 1390.4 1353.3 1294.8 1994 1358.6 1330.9 1383.6 1345.5 1287.2 1329.6 1338.3 1340.9 1341.8 1327.8 1359.5 1321.8 1995 1368.4 1382.4 - 1398.7 1335.9 1260.3 1261.0 1308.4 - 1370.7 1350.5 1345.2 1996 1334.9 1352.4 1345.9 1322.4 1318.3 1330.6 1380.0 1326.9 1371.3 1355.8 1315.3 1395.6 1997 1350.6 1343.8 1388.9 1316.6 1401.4 1353.8 1304.3 1354.4 - - - - 1998 1315.0 1424.0 1372.5 1439.8 1424.3 1409.0 1266.6 1295.5 1374.6 1315.0 1352.4 1324.4 1999 1344.6 1329.2 1385.0 1396.2 1337.5 1352.6 1348.4 1342.5 1331.0 1356.5 1388.8 1336.2 2000 1336.2 1384.2 1354.7 1356.9 1413.6 1366.6 1355.7 1324.4 1390.8 1336.7 1322.6 1253.8 2001 1324.2 1304.1 1349.5 1317.8 1371.9 1332.9 1321.0 1364.5 1400.8 1426.3 1334.1 1358.7 2002 1366.4 1396.6 1333.3 1327.9 1317.7 1316.2 1349.7 1396.1 1393.9 1299.2 1313.9 1354.8 2003 1311.8 1351.4 1368.1 1384.7 1367.7 1288.6 1315.4 1375.5 1362.4 1322.0 1295.4 1309.2 2004 1372.8 1438.6 1376.8 1320.3 1414.7 1319.5 1331.2 1361.4 1311.2 1357.6 1427.8 1338.9 2005 1317.1 1425.6 1361.9 1331.3 1291.1 1347.8 1371.5 1361.7 1423.6 1382.0 1326.6 1354.5 2006 1339.0 1402.8 1341.0 1340.3 1388.6 1356.4 1320.0 1344.9 1354.6 1353.6 1330.0 1311.1 2007 1344.7 1326.3 1350.6 1330.6 1423.2 - - - 1417.8 1320.8 1308.3 1339.1 2008 1368.3 1385.4 1390.3 1297.1 1379.2 1354.2 1366.6 1311.0 1448.9 1359.4 1318.7 1371.4 2009 1371.3 1334.5 1347.6 1305.5 1290.5 1324.1 1317.4 1330.3 1376.6 1313.6 1274.3 1342.8 2010 1298.1 1320.7 1369.0 1344.4 1353.5 1317.4 1360.7 1355.5 1370.7 1390.0 1396.9 1288.4 2011 1353.1 1412.1 1362.1 1312.6 1350.1 1322.2 1332.5 1377.9 1362.2 1399.2 1354.8 1399.0 2012 1371.7 1334.2 1370.7 1341.7 1337.6 1261.6 1289.0 1395.6 1367.9 1320.5 1337.1 1289.4 2013 1386.6 1360.8 1408.9 1398.8 1314.1 1257.0 1323.9 1318.2 1410.4 1368.4 1317.6 1302.8 2014 1297.2 1360.8 1324.6 1389.0 1355.4 1325.5 1371.3 1345.5 1344.6 1350.0 1322.2 1310.9 2015 1350.3 1367.9 1375.5 1365.7 1341.9 1272.8 1292.4 1344.4 1319.5 1405.2 1352.1 1337.9 2016 1356.7 1346.8 1396.4 1353.3 1468.2 1407.0 1400.0 1339.2 1452.0 1400.0 1325.3 1313.5 2017 1310.1 1399.1 1403.5 1356.4 1372.4 1295.0 1332.1 1355.6 1361.6 1297.1 1344.1 1316.1 2018 1340.1 1383.6 1333.2 1311.1 1368.0 1325.4 1390.6 1354.1 1356.1 1352.7 1349.2 1352.3 2019 1311.9 1334.8 1395.5 1343.0 1336.2 1336.0 1364.2 1356.9 1341.6 1373.3 1327.8 1329.4 2020 1311.6 1370.4 1393.4 1384.6 1373.7 1340.7 1381.0 1315.6 1330.5 1336.7 - 1318.2 2021 - 1381.8 1388.9 1411.3 1398.3 1394.2 - 1333.7 1388.6 1323.3 1370.9 1403.2 2022 1373.4 - - 1306.7 1369.1 1351.8 1308.8 1364.8 1404.9 1374.9 1400.7 1364.9 2023 1382.7 1392.2 1323.9 1333.1 1314.4 1323.2 1378.3 1307.6 1353.8 1293.1 1298.2 1341.8 2024 1358.7 1379.6 1325.5 1315.1 - - - - - - - -