Charting can be extremely useful for observing trends in meteorological conditions. Whether the swell is building, or the temperature or pressure is dropping, we included charts to help you take a look at what’s been happening over the last few hours or days. Tapping the time selection buttons below the chart will update the chart to show data plotted for an amount of time of your choosing.
A slowly rising – over days – atmospheric pressure typically indicates settled weather that will last a long time. A sudden drop in atmospheric pressure over a few hours often forecasts an approaching storm, which will not last long, with heavy rain and strong winds. (Source)