Generated using reanalysis data from NCEP
Both also display mean surface pressure.
Important: 500hPa charts are only for the NA region and currently go back to 1948
Use the url below to go straight to this chart next time
Choose the following options from the drop down boxes.
Step forward and backwards one day at a time by using the arrow buttons.
As of 19th November 2020 additional charts are being regularly added.