/barometer-trend

Calculate the tendency, trend and weather predictions of barometric pressure

Primary LanguageJavaScriptApache License 2.0Apache-2.0

Node.js CI

barometer-trend

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

Features

  • 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

Note

  • 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

Note

  • 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)

Contribute

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

Disclaimer

  • 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