I’ve been working on an updated (for me) snow probability based on a research paper (found by another individual that I’ve been working with on the Home Assistant forums) utilizing only temperature and humidity. This is written in JavaScript for now and I am currently using in Node-Red all inputs come from the Tempest.
I encourage others to test this to see how well it works. I will also include my current snow probability calculation that is largely based off the work of The Scottish Borders Weather site: https://www.bordersweather.co.uk/wxsnow.php
// Experimental Snow Probability
// https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2008GL033295
airTemperature = (msg.temperature - 32) * 5/9
relativeHumidity = msg.humidity
let pSnow = 1 / (1 + Math.exp(-10.04 + (1.41 * airTemperature) + (0.09 * relativeHumidity)));
pSnow = ((Math.round(pSnow * 1000))/1000*100)
msg.snow2= pSnow
return msg;
Current Snow Probability Calculation:
var temperature = msg.temperature
var dew_point = msg.dew_point
var snow_possible = msg.snow
var A = dew_point + temperature
var snow_prob
// Convert A from F to C
A = (A - 32) / 1.8
if (snow_possible == 'true') {
snow_prob = 80 - 10 * A
} else {
snow_prob = 0
}
msg.snow_probability = Math.round(snow_prob)
return msg
Any input is welcome.
