diff --git a/Nasal/startup.nas b/Nasal/startup.nas
new file mode 100644
index 000000000..f998d6e85
--- /dev/null
+++ b/Nasal/startup.nas
@@ -0,0 +1,33 @@
+var metar_runway = func {
+	# select runway according to wind direction reported by METAR
+
+	if (!getprop("/environment/metar/real-metar"))
+		return printlog("info", "metar-rwy: no live weather");
+	if (getprop("/environment/metar/base-wind-speed-kt") < 1)
+		return;		# windspeed pointless for runway choice
+	if (!getprop("/sim/startup/options/airport"))
+		return printlog("info", "metar-rwy: no airport requested");
+	if (getprop("/sim/startup/options/runway"))
+		return printlog("info", "metar-rwy: won't override explicit runway");
+	if (getprop("/sim/startup/options/heading-deg") < 9990.0)
+		return printlog("info", "metar-rwy: won't override explicit heading");
+	if (!getprop("/sim/presets/onground"))
+		return printlog("info", "metar-rwy: we aren't on ground");
+
+	var from = getprop("/environment/metar/base-wind-range-from");
+	var to = getprop("/environment/metar/base-wind-range-to");
+	var wind_from = (from + to) * 0.5;
+
+	printlog("info", "metar-rwy: setting new target heading ", wind_from);
+	setprop("/sim/presets/heading-deg", wind_from);
+	setprop("/sim/presets/longitude-deg", -9999);
+	setprop("/sim/presets/latitude-deg", -9999);
+	fgcommand("presets-commit");
+	printlog("info", "metar-rwy: selected runway: ", getprop("/sim/atc/runway"));
+}
+
+
+_setlistener("/sim/signals/nasal-dir-initialized", func {
+	metar_runway();
+	delete(globals, "startup");
+});