User manual

Figure 14

1. Touch the tendency once, as shown in Figure 14. The tendency will begin flashing and the

+ button and – button will be flashing (in the tendency section of the display).

2. Change Tendency. Select the + button or – button to alternate the display unit between

SUNNY, PARTLY CLOUDY and CLOUDY, and RAINY (press the tendency again if you

wish to skip this setting).

3. Pressure Threshold. Touch the TENDENCY section again, and the + button and – button

will be flashing. Touch the + button or – button to adjust the pressure threshold from 2.0 to

4.0 hPa/hr (the default is 2 hPa/hr).

4. Storm Threshold. Touch the TENDENCY section again, and the + button and – button

will be flashing. Touch the + button or – button to adjust the storm threshold from 3.0 to

9.0 hPa/hr (the default is 4 hPa/hr).

5.8 Barometric Pressure

Note: The weather station console displays two different pressures: absolute (measured) and

relative (corrected to sea-level).

To compare pressure conditions from one location to another, meteorologists correct pressure to

sea-level conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected

pressure (the pressure your location would be at if located at sea-level) is generally higher than your

measured pressure.

Thus, your absolute pressure may read 28.62 inHg (969 mb) at an altitude of 1000 feet (305 m), but

the relative pressure is 30.00 inHg (1016 mb).

The standard sea-level pressure is 29.92 in Hg (1013 mb). This is the average sea-level pressure

around the world. Relative pressure measurements greater than 29.92 inHg (1013 mb) are

considered high pressure and relative pressure measurements less than 29.92 inHg are considered low

pressure.

To determine the relative pressure for your location, locate an official reporting station near you (the

internet is best source for real time barometer conditions, such as Weather.com or Wunderground.com),

and set your weather station to match the official reporting station.