There was a flood in June 2013 in the No.12 glacier in Laohugou Valley,Qilian Mountain,the maximum of runoff is almost 20 m3·s-1 or more.The paper use available data and analyze the data of runoff,precipitation and temperature to show the change when the flood was coming.It turned out that the temperature from June 12 to June 1 9 was over 0℃.The maximum of runoff and precipitation happened at the same time with the low temperature.%祁连山老虎沟12号冰川在2013年6月出现了一场突然性的洪水,最大流量约20 m3·s-1.洪水导致河流改道,水文数据中断,下游道路冲毁.利用6月河水改道前的流量数据及对应的气象数据,分析了洪水发生前温度和降水的变化情况,并利用度日因子法计算出6月13—19日的冰川消融水当量.结果表明,从6月12日开始昼夜温度及日均温均大于0℃,最大降水和最大流量几乎同时发生,同时段的温度却较低.
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