Digital barometers have a function where when they detect a noticeable
decrease in pressure in a short time, and set off an alarm to warn of
impending high winds. It is an attempt to detect an oncoming low
pressure system. I had one, and the alarm went off fairly frequently,
but it is not a very reliable system. I never had it inform me of
something I didn’t already know. The RADAR alarm, even on an
inexpensive system, seems to work very well. I never saw a large
squall or a ship that the RADAR didn’t see first.