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    2.2.6 • Public • Published

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    Calculate the tendency and trend of a barometer for a one to three hour period including barometric weather predictions.


    • Tendency and trend of the barometer for the last hour or three hours (FALLING|SLOWLY)
    • Prediction of weather and systems:
      • By pressure trend only (Expect gale force weather')
      • By pressure trend, thresholds and wind direction (Increasing rain, clearing within 12 hours.)
      • By seasonal pressure thresholds for winter and summer (Cloudy and humid, thunderstorms)
      • Front system tendency for the last three hours (Falling before a lesser rise | Cold front passage | Strong and gusty, then veers)
      • Force wind expectation in Beaufort scale based on the pressure tendency (F8-9)
    • Detects current pressure system Low, Normal, High


    • Picks the period with the highest severity (one hour or three hours)
    • All calculations corrected (internally) to sea level pressure by optional altitude and temperature
    • Up to 48 hour history

    Install & Use

    npm i barometer-trend
    const barometer = require('barometer-trend');
    barometer.addPressure(datetime1, 101500);
    barometer.addPressure(datetime2, 101505);
    barometer.addPressure(datetime3, 101512, 100, 20, 225); //100 = altitude, 20 = C degrees, 225 = wind direction 
    //barometer.addPressure(...) is more precise when pressure is corrected by altitude and temperature.
    let forecast = barometer.getPredictions(); //returns JSON


    • Pressure must be input in Pascals, 1015 mBar/hPa = 101500 Pascal.
    • getPredictions() investigate the trend for the latest one hour and three hours
    • If run less than one hour or three hours, the latest timing up until now is picked.
    • The most recent trend with the highest severity is chosen (One hour or Three hour reading)


    Feel free to contribute; create an Issue, and Pull Request including test code.


    • All calculations is done by online research; the author of this library does not have a background in metereology. All sources listed below.
    • A barometer is only one source of weather information and may give a general trend and indication, but not "see" the overall picture. (There's a reason satelittes exists and being a metereologist is a paid job.)
    • All calculations presumes being located at sea with no disturbances.
    • Near land, winds may be one-two Beaufort scale numbers lower and the wind might be coming from "the wrong direction".
    • In subtropic and tropical regions some of the calculations may not be valid at all; i.e. the trade winds (easterlies) is different from northern hemishpere west->east (westerlies) low pressure systems.
    • In trade wind zones observe the daily variations; any change to this pattern could possibly indicate gale weather.

    Sources / References


    npm i barometer-trend

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