THEY pop up on our TV screens every single day but more often than not we have no idea what we’re actually looking at.

In the example below the date tells you the likely weather conditions of a high pressure system. Synoptic chart for 14 November 2020 Synoptic charts often have weather circles shown on them.

These charts are prepared twice a day at 0000Z and 1200Z for several mandatory pressure levels (925 mb, 850 mb, 700 mb, etc.) from the temperature, humidity, and wind data provided by the ...

Answer: Constant pressure charts like the 500 mb chart shown below may seem obvious to interpret. It has many features similar to what you might see on the surface analysis chart.

Surface chart for 0000Z on December 15, ... For those interested in details of barometric pressure records (high and low) for about 80 U.S. cities click this link to see a Word document with such.

HIGH PRESSURE SYSTEM: ... On a weather map (synoptic chart), a low is denoted by an ‘L’ with the central pressure underneath. East Coast Lows bring a lot more rain than this.

THEY pop up on our TV screens every single day but more often than not we have no idea what we’re actually looking at.