Colorado wildfire spreads as winds strengthen

(Reuters) - A stubborn Colorado wildfire grew by around a fifth on Saturday, consuming sparsely populated land as low humidity and high winds left firefighters bracing for it to spread, officials said."Weather will be a concern this weekend as critical fire weather conditions are expected," fire officials said in a Saturday email update on the so-called 416 Fire."Southwest to west winds will be strengthening across southwest Colorado this weekend."The Haines Index, used by firefighters to assess