Suunto Traverse Alpha User Guide - 2.1
Weather indicators
In addition to the barometer graph (seeUsing barometer profile), Suunto Traverse Alpha has two weather indicators: weather trend and storm alarm.
The weather trend indicator is displayed as a view in the time display, providing you a quick way to check weather changes.
The weather trend indicator is comprised of two lines forming an arrow. Each line represents a 3-hour period. A change in barometric pressure greater than 2 hPa (0.59 inHg) over three hours triggers a change the direction of the arrow. For example:
 | pressure dropping heavily over the last six hours |
 | pressure was steady, but rising heavily over the last three hours |
 | pressure was rising heavily, but dropping heavily over the last three hours |
Storm alarm
A significant drop in barometric pressure typically means a storm is coming and you should take cover. When the storm alarm is active, Suunto Traverse Alpha sounds an alarm and flashes a storm symbol when the pressure drops 4 hPa (0.12 inHg) or more during a 3-hour period.
The storm alarm is off by default. You can turn it on in the options menu under GENERAL » Alerts » Storm alarm.
The storm alarm does not work if you have altimeter profile activated.
When a storm alarm sounds, pressing any button ends the alarm. If no button is pressed, the alarm repeats once after five minutes. The storm symbol remains on the display until the weather conditions stabilize (pressure drop slows down).
A special lap (called 'storm alarm') is generated when a storm alarm occurs while recording an activity.