Engineer – not Pilot
Today’s chart shows low level winds as the usual NE trades, but at FL300 the wind is a westerly tailwind.
Flying around the islands at relatively low altitude, your acquaintance would be used to the prevailing NE thru E trade winds.
You could highlight the direction of the Jet stream and the effect of westerly winds aloft producing snow in the Sierra Nevada mountains, which invariably comes in from the west.
Good Luck…