alias windVariableDirectionTrend3 = false;
if (substr(g,-2,2) is "KT") {
			constant windUnitsTrend3="knots" :dump;
      rename(g,windInKnotsTrend3) ;
			modify windInKnotsTrend3 : hidden;
			windSpeedTrend3=to_string(windInKnotsTrend3,3,2) : dump;
			if (substr(windInKnotsTrend3,0,3) is "VRB") {
					constant windDirectionTrend3= "Variable" : dump;
					alias windVariableDirectionTrend3 = true;
			} else {
					if (is_integer(windInKnotsTrend3,0,3)) {
							windDirectionTrend3=to_string(windInKnotsTrend3,0,3) : dump;
					}
			}
			if (substr(windInKnotsTrend3,5,1) is "G") {
				windGustTrend3=to_string(windInKnotsTrend3,6,2);
			}
      group g : dump; non_alpha na;
}
if (substr(g,-3,3) is "KMH") {
			constant windUnitsTrend3="km/h" : dump;
      rename(g,windInKilometresPerHourTrend3) ;
			modify windInKilometresPerHourTrend3 : hidden;
			windSpeedTrend3=to_string(windInKilometresPerHourTrend3,3,2) : dump;
			if (substr(windInKilometresPerHourTrend3,0,3) is "VRB") {
					constant windDirectionTrend3= "Variable" : dump;
					alias windVariableDirectionTrend3 = true;
			} else {
					if (is_integer(windInKilometresPerHourTrend3,0,3)) {
							windDirectionTrend3=to_string(windInKilometresPerHourTrend3,0,3) : dump;
					}
			}
			if (substr(windInKilometresPerHourTrend3,5,1) is "G") {
				windGustTrend3=to_string(windInKilometresPerHourTrend3,6,2);
			}
      group g : dump; non_alpha na;
}
if (substr(g,-3,3) is "MPS") {
			constant windUnitsTrend3="m/s" : dump;
      rename(g,windInMetresPerSecondTrend3) ;
			modify windInMetresPerSecondTrend3 : hidden;
			windSpeedTrend3=to_string(windInMetresPerSecondTrend3,3,2) : dump;
			if (substr(windInMetresPerSecondTrend3,0,3) is "VRB") {
					constant windDirectionTrend3= "Variable" : dump;
					alias windVariableDirectionTrend3 = true;
			} else {
					if (is_integer(windInMetresPerSecondTrend3,0,3)) {
							windDirectionTrend3=to_string(windInMetresPerSecondTrend3,0,3) : dump;
					}
			}
      group g : dump; non_alpha na;
			if (substr(windInMetresPerSecondTrend3,5,1) is "G") {
				windGustTrend3=to_string(windInMetresPerSecondTrend3,6,2);
			}
}