Functions for general alerts and Defiance-specific alerts

weather/alerts_filter.js

@@ -0,0 +1,46 @@
+let alerts = msg.payload
+
+// Filter for Severe Thunderstorm Warnings
+
+let ts = alerts.filter(function(alert) {
+    if (alert.raw.properties &&
+    alert.raw.properties.event === "Severe Thunderstorm Warning") {
+        return true
+    }
+})
+
+// Filter for Severe Thunderstorm Warnings with tornado detection
+// that have a tornado possible parameter
+
+let tstp = alerts.filter(function(alert) {
+    if (alert.raw.properties &&
+    alert.raw.properties.event === "Severe Thunderstorm Warning" &&
+    alert.raw.properties.parameters &&
+    alert.raw.properties.parameters.tornadoDetection &&
+    alert.raw.properties.parameters.tornadoDetection.length > 0) {
+        let tornadoPossible = alert.raw.properties.parameters.tornadoDetection[0]
+        return tornadoPossible === "POSSIBLE"
+    }
+})
+
+// Filter for Tornado Warnings
+
+let tornado = alerts.filter(function(alert) {
+    if (alert.raw.properties &&
+    alert.raw.properties.event === "Tornado Warning") {
+        return true
+    }
+})
+
+// If there are any alerts, return them
+
+msg.ts = ts
+msg.ts_count = ts.length
+
+msg.tstp = tstp
+msg.tstp_count = tstp.length
+
+msg.tornado = tornado
+msg.tornado_count = tornado.length
+
+return msg

weather/defiance.js

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+let alerts = msg.payload.features
+
+// Filter for Severe Thunderstorm Warnings
+
+let ts = alerts.filter(function(alert) {
+    if (alert.properties &&
+    alert.properties.event === "Severe Thunderstorm Warning") {
+        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 &&
+    alert.properties.event === "Severe Thunderstorm Warning" &&
+    alert.properties.parameters &&
+    alert.properties.parameters.tornadoDetection &&
+    alert.properties.parameters.tornadoDetection.length > 0) {
+        let tornadoPossible = alert.properties.parameters.tornadoDetection[0]
+        return tornadoPossible === "POSSIBLE"
+    }
+})
+
+// Filter for Tornado Warnings
+
+let tornado = alerts.filter(function(alert) {
+    if (alert.properties &&
+    alert.properties.event === "Tornado Warning") {
+        return true
+    }
+})
+
+// If there are any alerts, return them
+
+msg.ts = ts
+msg.ts_count = ts.length
+
+msg.tstp = tstp
+msg.tstp_count = tstp.length
+
+msg.tornado = tornado
+msg.tornado_count = tornado.length
+
+return msg