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www.answers.com/Q/What_barometer_indicates_that_foul_weather_is_approaching

A falling pressure on the barometer indicates bad weather approaching, especially if falling rapidly.

www.answers.com/Q/What_indicates_that_foul_weather_is_approaching_when_your'e_in_a_boat

Usually on boats they have a barometer, and when the barometer begins to fall it indicates that bad weather is approaching.

www.boat-ed.com/pennsylvania/studyGuide/Severe-Weather-and-How-to-Determine-the-Distance-of-an-Approaching-Thunderstorm/101039_101039206

A falling barometer indicates foul weather is approaching. Watch for wind direction shifts, which usually indicate a weather change. Watch for lightning and  ...

science.howstuffworks.com/nature/climate-weather/atmospheric/barometer.htm

A barometer is an instrument that is used to predict the weather. ... indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.

www.reference.com/science/indications-foul-weather-e8c024cede5a116f

Indications of foul weather include a change in wind direction and speed due to low- or ... These are the traditional methods for detecting an approaching storm. ... are clumpy layers of clouds closer to the surface that indicate a storm is on the horizon. ... Before the invention of modern weather instruments, such as weather  ...

www.artofmanliness.com/2015/07/07/fair-or-foul-how-to-use-a-barometer

Jul 7, 2015 ... In just a couple decades, the instrument became available to well-to-do .... meaning high pressure — and is stable, indicates good weather.

www.srh.noaa.gov/jetstream/atmos/pressure.html

... is converted to a value that would be observed if that instrument were located at sea level. The two ... Weather maps showing the pressure at the surface are drawn using millibars. ... If it stands at "FAIR" and falls to "CHANGEABLE", expect foul weather. Its motion upwards, indicates the approach of fine weather; its motion ...

en.wikisource.org/wiki/Weather_Facts_and_Predictions_-_3rd_edition

Jan 2, 2014 ... Indications of approaching change of weather are shown by the ... A rapid and considerable fall indicates heavy rains with general foul weather. ... view of an observer, by which his instruments may be affected considerably, ...

archive.hokulea.com/ike/hookele/weather_forecasting.html

The art of non-instrument weather forecasting can be used to confirm ... Shifts in wind direction may indicate changes in weather. ... [As the clouds approach, if the ocean surface beneath the clouds] is black, you know it is a real strong wind. ... storm is passing to the south of you and no bad weather will occur at your location.

www.wilderness-survival-skills.com/how-to-predict-weather.html

Decreasing air pressure indicates the approach of a low pressure area, ... A barometer measures air pressure and is a well-known instrument to predict weather. ... descending, the air pressure decreases and bad weather will be expected.