User's Manual

Version 1.2 ©Copyright 2010, Ambient LLC. All Rights Reserved. Page 10
4.5.2 WeatherIcons
The six weather icons are Sunny, Partly Cloudy, Cloudy, Rainy, Stormy and Snowy, as shown in
Figure 3. If there is no significant change in pressure, the forecast icon will not change.
Sunny Partly Cloudy Cloudy Rainy Stormy Snowy
Figure 3
4.5.3 WindIcon
If the air pressure decreases less than -3 mmHg within 3 hours, the wind icon will be displayed, as
shown in Figure 4. This rapid decrease in barometric pressure indicates winds are expected.
Figure 4
4.5.4 Pressurethresholdsetting
The pressure threshold (the negative or positive rate of change of pressure signifying a change in the
weather) can be adjusted by the user from level 2 to level 4 (default level 2 mbar/hour).
The lower the level pressure threshold setting, the higher sensitivity for weather forecast changes.
Locations that experience frequent changes in air pressure require a higher setting compared to
locations where the air pressure is typically stagnant.
4.5.5 Stormalertthreshold
The storm threshold (the negative rate of pressure change signifying a storm is expected) can be
adjusted by the user from level 3 to level 5 (the default level 4 mbar/hour).
When negative rate of change of pressure is exceeded for 3 hours, the storm warning indicator will be
activated, and the clouds with rain icon and tendency arrows will flash for 3 hours indicating the storm
warning feature has been activated.
4.5.6 PressureRateofChangeIndication
The pressure rate of change icon is updated every 10 minutes and provides an indication in short term
pressure changes. The icon displays - Æ + if pressure is increasing, and + Æ - if pressure is decreasing.
The arrow is not present if there are no pressure changes in the last 10 minutes.