In 2010, the predominant Argentinean vintage on store shelves and wine lists now, a cool spring resulted in poor fruit set, and an early heat spike was followed by dry, cloudy growing conditions. Paradoxically, the combination proved advantageous. The cooler summer extended the growing season and allowed for even maturation. The resulting wines are ripe, yet elegant and balanced, marking a return to form for Argentina's winemakers. Wine Spectator's Nathan Wesley explains.