[Feature Request]: Client Side Weather Station Conditions Values

[garthvh]

OS

iOS, iPadOS, macOS

Description

I want to extrapolate a few weather station glance values from locally available sensors if weather telemetry modules are available on a device.

To start with I want to have a conditions symbol, current temperature, and AQI with color dot if there is a connected Air Quality sensor. These values will replace the weather kit forecast on node details if sensor data is available for that node.

• Simple current conditions icon like the WeatherKit currentConditions with basic condition types we can calculate from a BME680 should be able to do clear, cloudy, hot, rain, frigid and snow with a reasonable amount of accuracy
• Indoor Air Quality for BME680
• Air Quality Index calculation for more advanced sensors
• Create a WeatherConditions Enum
• Heat index calculation

Display Helpers

• Weather Condition Symbol & Current Temperature
• AQI line display like is available in the weather details Maps.
• Small Circle AQI Display like like the quick glance in maps

Potential Conditions Calculations

.clear
.cloudy (humidity is > 70% and temp < 70)
.frigid (temp < freezing)
.hot (temp > 80F)
.rain (temp > freezing and humidity is > 98%)
.snow (temp < freezing and humidity is > 98%)

Apple Weather Conditon	Symbol Name	BME680
.clear	sun.max	*
.cloudy	cloud	*
.foggy	cloud.fog
.haze	sun.haze
.mostlyClear	sun.min
.partlyCloudy	cloud.sun
.smoky	smoke	*
.breezy	wind
.windy	wind
.drizzle	cloud.drizzle
.heavyRain	cloud.heavyrain
.isolatedThunderstorms	cloud.bolt
.rain	cloud.rain	*
.sunShower	cloud.sun.rain
.scatteredThunderstorms	cloud.sun.bolt
.strongStorms	cloud.bolt.rain
.thunderstorms	cloud.bolt.rain
.frigid	thermometer.snowflake	*
.hail	cloud.hail
.hot	thermometer.sun.fill	*
.flurries	cloud.snow
.sleet	cloud.hail
.snow	cloud.snow	*
.sunFlurries	cloud.sun.rain
.wintryMix	cloud.snow
.blizzard	cloud.snow.fill
.blowingSnow	wind.snow
.freezingDrizzle	cloud.hail
.freezingRain	cloud.hail
.heavySnow	cloud.snow
.hurricane	hurricane
.tropicalStorm	tropicalstorm

Links

Weather Kit Weather Conditions Values
https://www.airnow.gov/aqi/aqi-calculator-concentration/
https://github.com/blueskyanalytics/aqi-calculator
https://www.kaggle.com/code/rohanrao/calculating-aqi-air-quality-index-tutorial
https://github.com/BoschSensortec/BSEC-Arduino-library
https://www.circuitschools.com/interfacing-bme680-with-arduino-also-measure-indoor-air-quality-index/
https://developer.apple.com/documentation/foundation/unitpressure

Potential Advanced Calculations

Zambretti Weather Forcasting
Heat Index

[rcarteraz]

This looks awesome! Looking forward to seeing what you come up with.

[asjmcguire]

dew point = Tc - ((100 - RH)/5.)
Dew point = Temp in celcius - (( 100 - humidity) /5)

Dew point is a better calculation for snow, because the dew point needs to be close to freezing. The humidity does not need to be anywhere close to 98% for snow.

[garthvh]

dew point = Tc - ((100 - RH)/5.) Dew point = Temp in celcius - (( 100 - humidity) /5)

Dew point is a better calculation for snow, because the dew point needs to be close to freezing. The humidity does not need to be anywhere close to 98% for snow.

Wound up using the Magnus formula as it seems to get me a little closer to what I was seeing in weather kit, seems to be pretty good

/// Magnus Formula
func calculateDewPoint(temp: Float, relativeHumidity: Float) -> Double {
    let a: Float = 17.27
    let b: Float = 237.7
    let alpha = ((a * temp) / (b + temp)) + log(relativeHumidity / 100.0)
    let dewPoint = (b * alpha) / (a - alpha)
    let dewPointUnit = Measurement<UnitTemperature>(value: Double(dewPoint), unit: .celsius)
    let locale = NSLocale.current as NSLocale
    let localeUnit = locale.object(forKey: NSLocale.Key(rawValue: "kCFLocaleTemperatureUnitKey"))
    var format: UnitTemperature = .celsius

    if localeUnit! as? String == "Fahrenheit" {
	    format = .fahrenheit
    }
    return dewPointUnit.converted(to: format).value
}