South Africa's rand falls as commodity surge crumbles

South Africa's rand weakened on Friday as key commodity prices succumbed to a fresh bout of dollar strength, putting the local currency's recent rally under pressure after it failed to break through key technical milestones. * At 0650 GMT, the rand had weakened 0.8 percent to 13.4700 per dollar compared with a close of 13.3650 overnight in New York. * Dollar rose from seven-week lows, boosted by optimism over the U.S. economic outlook and rising Treasury yields as President Donald Trump looked s