barometer-trend/predictions/beaufort.js

Calculate the tendency, trend and weather predictions of barometric pressure

const MAX_RATIO = 9999;
const MIN_RATIO = -9999;

const BEAUFORT_RATIOS = [
    { low: 2.67, high: 3.33, force: "F6-7", min: 6, max: 7, description: "Strong breeze to near gale" },
    { low: 3.33, high: 5.5, force: "F8-9", min: 8, max: 9, description: "Gale to strong gale" },
    { low: 5.5, high: MAX_RATIO, force: "F10+", min: 10, max: 12, description: "Storm or more" },
    { low: -3.33, high: -1.67, force: "F6-7", min: 6, max: 7, description: "Strong breeze to near gale" },
    { low: MIN_RATIO, high: -3.33, force: "F8-12", min: 8, max: 12, description: "Gale or violent storm conditions" },
];

/**
 * Get Beaufort scale details by pressure variation ratio
 * @param {number} ratio - The pressure variation ratio
 * @returns {Object} Beaufort scale details
 */
function getByPressureVariationRatio(ratio) {
    try {
        let beaufort = BEAUFORT_RATIOS.find((b) => ratio <= b.high && ratio >= b.low);
        return beaufort !== undefined ?
            { force: beaufort.force, min: beaufort.min, max: beaufort.max, description: beaufort.description } :
            { force: "Less than F6", min: 0, max: 6, description: "Less than a strong breeze" };
    } catch (error) {
        console.error("Error in getByPressureVariationRatio: ", error);
        return { force: "Unknown", min: 0, max: 0, description: "Unknown conditions" };
    }
}

module.exports = {
    getByPressureVariationRatio
};