SUBSCRIBE NOW AND SAVE 3 months just 99¢/month

ADVERTISEMENT

ADVERTISEMENT

WeatherTalk: Air pressure is fundamental to forecasting

Air pressure patterns across a region indicate areas of sinking or rising air, which is directly related to weather.

Cartoon of John Wheeler with a speech bubble depicting weather events

Barometric pressure is a routinely measured aspect of the atmosphere with a critical role in weather forecasting. Essentially, air pressure is proportional to the weight of the air above a point. Although the air pressure reading at any single point has little bearing on the weather, air pressure patterns (higher and lower) across a region indicate areas of sinking or rising air, which is directly related to weather. Downward-moving air generates clear weather, whereas rising air makes clouds and precipitation.

To be able to forecast how these patterns of pressure will change over time is critical to weather forecasting. This is why a falling pressure or a rising pressure is a telling sign. Differences in pressure across distances force air to move to attempt to equalize these pressures, so differences in air pressure are the primary reason the wind blows.

Related Topics: WEATHER
What to read next
Strong eruptions in the tropics have been known to cause cooling due to large amounts of sulphur dioxide being placed into the upper atmosphere.
A modest shift could easily leave our region with more air from the southwest and with much milder and drier weather.
StormTRACKER Meteorologist John Wheeler discusses the changing weather
Nature's beauty from a northern perspective