HA-NerdFlows-Functions/weather/local_alerts.js

const severeWarningEvents = ["Severe Thunderstorm Warning","Destructive Severe Thunderstorm Warning","Considerable Destructive Severe Thunderstorm Warning"]
const tornadoWarningEvents = ["Tornado Warning","Radar Indicated Tornado Warning","Confirmed Tornado Warning","Tornado Emergency"]
const tornadoWatchEvents = ["Tornado Watch"]
const severeThunderstormWatchEvents = ["Severe Thunderstorm Watch"]
const area = msg.area
const mqttTopic = "weather/alerts/" + area
const allTopic = mqttTopic + "/alerts"
const tstormTopic = mqttTopic + "/severe_thunderstorm_warning"
const tornadoWarnTopic = mqttTopic + "/tornado_warning"
const tornadoWatchTopic = mqttTopic + "/tornado_watch"
const severeThunderstormWatchTopic = mqttTopic + "/severe_thunderstorm_watch"

let alerts = msg.payload.features
let tornado_possible = false
let considerable_destructive = false
let confirmed = false

// Filter for Severe Thunderstorm Warnings

let ts = alerts.filter(function(alert) {
    if (alert.properties &&
    severeWarningEvents.includes(alert.properties.event)) {
        return true
    }
})

// Filter for Severe Thunderstorm Warnings with tornado detection
// that have a tornado possible parameter

let tstp = alerts.filter(function(alert) {
    if (alert.properties &&
    severeWarningEvents.includes(alert.properties.event) &&
    alert.properties.parameters &&
    alert.properties.parameters.tornadoDetection &&
    alert.properties.parameters.tornadoDetection.length > 0) {
        let tornadoPossible = alert.properties.parameters.tornadoDetection[0]
        return tornadoPossible === "POSSIBLE"
    }
})

if (tstp.length > 0) {
    tornado_possible = true
}

// Filter for considerable destructive severe thunderstorm warnings

let cdst = alerts.filter(function(alert) {
    if (alert.properties &&
    alert.properties.event === "Considerable Destructive Severe Thunderstorm Warning") {
        return true
    }
})

if (cdst.length > 0) {
    considerable_destructive = true
}

// Filter for Tornado Warnings

let tornado = alerts.filter(function(alert) {
    if (alert.properties &&
    tornadoWarningEvents.includes(alert.properties.event)) {
        return true
    }
})

let confirmed_tornado = alerts.filter(function(alert) {
    if (alert.properties &&
    alert.properties.event === "Confirmed Tornado Warning") {
        return true
    }
})

if (confirmed_tornado.length > 0) {
    confirmed = true
}

// Filter for Tornado Watches

let tornado_watch = alerts.filter(function(alert) {
    if (alert.properties &&
    tornadoWatchEvents.includes(alert.properties.event)) {
        return true
    }
})

// Filter for Severe Thunderstorm Watches

let severe_thunderstorm_watch = alerts.filter(function(alert) {
    if (alert.properties &&
    severeThunderstormWatchEvents.includes(alert.properties.event)) {
        return true
    }
})

// If there are any alerts, return them

let allAlerts = {
    "payload": msg.payload.features,
    "topic": allTopic
}

let tstormMsg = {
    "payload": {
        "alerts": ts,
        "count": ts.length,
        "tornado_possible": tornado_possible,
        "considerable_destructive": considerable_destructive
    },
    "topic": tstormTopic
}

let tornadoWarnMsg = {
    "payload": {
        "alerts": tornado,
        "count": tornado.length,
        "confirmed": confirmed
    },
    "topic": tornadoWarnTopic
}

let tornadoWatchMsg = {
    "payload": {
        "alerts": tornado_watch,
        "count": tornado_watch.length
    },
    "topic": tornadoWatchTopic
}

let severeThunderstormWatchMsg = {
    "payload": {
        "alerts": severe_thunderstorm_watch,
        "count": severe_thunderstorm_watch.length
    },
    "topic": severeThunderstormWatchTopic
}

// Create status message for node

let statusMsg = {
    "status": {
        "fill": "green",
        "shape": "dot",
        "text": `${alerts.length} alerts processed at ${new Date().toLocaleString()}`
    }
}

// Send messages to output nodes

node.send([allAlerts,tstormMsg,tornadoWarnMsg,tornadoWatchMsg,severeThunderstormWatchMsg,statusMsg])