So the pressure/height maps…
Permalink
So the pressure/height maps above are showing anomalies, meaning a departure from the long term average. The reds are where it is higher than *average* and the blues are where it is lower than *average.* The typical pressure patterns can be found here: https://www.cpc.ncep.noaa.gov/products/precip/CWlink/climatology/Height-500-NH.shtml