4
GB
Important:
1. The accuracy of weather forecasting when using
pressure trend alone is about 70 to 75 percent and,
therefore, we cannot be held responsible for any
inconveniences caused by an inaccurate weather
forecast.
2. The weather forecast symbols may not reflect the
current weather condition. The symbols are
forecasting the future.
3. A ‘ Sunny ‘ forecast covering the night-time
reflects fine clear weather.
HOW TO READ THE BAR GRAPH
PRESSURE TREND
Stored memory of the barometric pressure changes are
displayed on the chart, in 5 steps indicating the pressure
1,3,6,12 and 24 hours ago. This chart is plotted by com-
paring the past barometric pressure to the present pres-
sure. The scale on the right shows the comparison result.
Indicator
displays on
the unit
Forecast
Sunny
Slightly Cloudy Cloudy
Rainy
The ‘ 0 ‘ in the middle of the scale means equal to present
pressure, ‘ +2‘ means the past pressure was higher than the
present pressure by 2 mb.
This gives you the pressure trend over the last 24 hours.
The weather will be getting better ( worse ) if this chart
shows the bar marks moving up ( down ) towards the
present time ‘ 0H ‘.
BAR GRAPH PRESSURE TREND
Important:
It is only possible to measure the barometric pressure trend
properly if your barometer remains at the same altitude.
When moving around at different altitudes within a short
time period, the air pressure changes, the barometric pressure
change is not
correct until
the barometer has remained at a
constant altitude for 24 hours.
