The snowpack in Colorado’s mountains has reached 93% of normal, federal survey data showed Tuesday — lagging slightly at the moment when cities and food growers decide whether water supplies will be sufficient for crops, cattle and a growing population. While recent heavy snow bodes well, measured in relation to the norm between 1981 and 2010, federal forecasters on Tuesday also warned they’re expecting “below normal” water flows in streams and rivers once snow melts due to decades of mostly increasing aridity.