/**
 * Display thresholds and constants for weather data formatting
 *
 * These values determine when certain weather metrics are shown or highlighted
 */
export declare const DisplayThresholds: {
    /**
     * Temperature thresholds (in Fahrenheit)
     */
    readonly temperature: {
        /** Show heat index when temperature is above this value */
        readonly showHeatIndex: 80;
        /** Show wind chill when temperature is below this value */
        readonly showWindChill: 50;
        /**
         * Minimum apparent-vs-actual temperature gap before "Feels Like" is shown.
         *
         * Keyed by unit because Open-Meteo returns values already in the caller's
         * unit — a single Fahrenheit gap would silently become a ~1.8x stricter
         * rule in Celsius.
         */
        readonly feelsLikeGap: {
            readonly F: 3;
            readonly C: 2;
        };
    };
    /**
     * Wind thresholds
     */
    readonly wind: {
        /** Show gusts if they are this ratio higher than sustained wind speed (1.2 = 20% higher) */
        readonly gustSignificanceRatio: 1.2;
    };
    /**
     * Visibility thresholds (in miles)
     */
    readonly visibility: {
        /** Dense fog */
        readonly denseFog: 0.25;
        /** Fog */
        readonly fog: 1;
        /** Haze or mist */
        readonly hazeMist: 3;
        /** Clear visibility */
        readonly clear: 10;
    };
    /**
     * Current-conditions staleness and station-retry thresholds.
     */
    readonly currentConditions: {
        /**
         * Observation age (minutes) at which a reading is flagged stale.
         * NOAA stations report at least hourly, so 2 h means at least 2 missed
         * reporting cycles.
         */
        readonly staleWarningMinutes: 120;
        /**
         * Observation age (minutes) at which a reading is rejected outright.
         * This is METAR's outer acceptance bound, reused here as the trigger
         * for retrying against a fresher station.
         */
        readonly staleAcceptanceMinutes: 360;
        /**
         * Total stations whose observations are fetched for a single request,
         * including the first attempt.
         */
        readonly maxStationAttempts: 3;
    };
    /**
     * Precipitation thresholds
     */
    readonly precipitation: {
        /** Light precipitation (inches per hour) */
        readonly light: 0.1;
        /** Moderate precipitation (inches per hour) */
        readonly moderate: 0.3;
        /** Heavy precipitation (inches per hour) */
        readonly heavy: 0.5;
        /**
         * Minimum precipitation before the "Recent Precipitation" section (and
         * its breakout lines) is shown — half of the smallest displayed
         * increment. Without this, trace drizzle renders an all-zero section
         * (e.g. "**Current:** 0.00 in") because the gate used to be `> 0` while
         * display rounds to 2 decimals (imperial) / 1 decimal (metric).
         *
         * Keyed by unit because Open-Meteo returns values already in the
         * caller's unit — same rationale as `temperature.feelsLikeGap`.
         */
        readonly traceFloor: {
            readonly inch: 0.005;
            readonly mm: 0.05;
        };
    };
    /**
     * Thermal stress thresholds
     */
    readonly thermalStress: {
        /**
         * Display gates only. The band boundaries themselves live in
         * `src/utils/thermalStress.ts` (where Fosberg's live), and those functions
         * return null below their own lowest band — so *raising* a gate here
         * suppresses lines as expected, while *lowering* one past the pure
         * module's floor has no effect until that floor moves too.
         */
        /** Render the frostbite line when effective wind chill (°F) is at or below this */
        readonly showFrostbiteAtWindChillF: -18;
        /** Compute/render WBGT only when air temp (°F) is at or above showHeatIndex and rounded WBGT (°F) is at or above this */
        readonly showWbgtF: 80;
    };
    /**
     * Life-threatening alert banner gate
     */
    readonly criticalAlert: {
        /**
         * Display gates only. The predicate that reads them lives in
         * `src/utils/criticalAlert.ts`, which owns the *shape* of the rule — the
         * three-axis leg is an `and`, the response leg stands alone, and the two
         * are `or`ed. Widening a list here loosens the gate; it cannot change that
         * shape.
         *
         * These are membership lists rather than a rank because CAP's severity,
         * urgency and certainty are unordered enums as far as this repo is
         * concerned: `CAP_SEVERITY_ORDER` in `alertsHandler.ts` is a sort rank for
         * display, and reusing it here would tie a safety gate to a presentation
         * decision.
         *
         * Calibrated against the live national feed — see the Verification section
         * of the design plan for the histogram the current values were read from.
         * Tuning is a config change here, deliberately, so re-calibration never
         * needs a code review of the predicate.
         */
        /** CAP `severity` values that can reach the gate's three-axis leg */
        readonly severities: readonly string[];
        /** CAP `urgency` values that can reach the gate's three-axis leg */
        readonly urgencies: readonly string[];
        /** CAP `certainty` values that can reach the gate's three-axis leg */
        readonly certainties: readonly string[];
        /** CAP `response` values that fire the gate on their own, whatever the severity */
        readonly responses: readonly string[];
    };
};
/**
 * API-related constants
 */
export declare const ApiConstants: {
    /**
     * Historical data threshold (in days)
     * Data older than this uses archival API instead of recent observations
     */
    readonly historicalDataThresholdDays: 7;
    /**
     * Maximum date range for hourly historical data (in days)
     */
    readonly maxHourlyHistoricalDays: 31;
};
/**
 * Formatting constants
 */
export declare const FormatConstants: {
    /**
     * Default forecast periods to show
     */
    readonly defaultForecastDays: 7;
    /**
     * Maximum forecast days (Open-Meteo supports up to 16 days)
     */
    readonly maxForecastDays: 16;
    /**
     * Default observation limit for historical data
     */
    readonly defaultHistoricalLimit: 168;
    /**
     * Maximum observations to return.
     * 744 = 31 days x 24 h — the largest hourly window
     * ApiConstants.maxHourlyHistoricalDays allows, so a full 31-day hourly
     * range can display without silent tail loss.
     */
    readonly maxHistoricalLimit: 744;
};
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