摘要: |
Warm temperatures in the mountainous region of the upper Missouri River Basin has led to a quick melt of the mountain snowpack, the Corps of Engineers reports. The rapid melting combined with precipitation in the western half of the basin resulted in above-average inflow into the reser-voir system. May runoff for the basin above Sioux City, Iowa, was 4.9 million acre-feet (maf.), 144 percent of average. "The warm temperatures in the northern Rockies has melted the snow earlier than is typical," said John Remus, chief of the Corps' Missouri River Basin Water Management Division in Omaha, Neb. "With much of the mountain snowpack already melted, the basin will need additional rainfall to continue the trend of above-average runoff." The annual runoff forecast above Sioux City is 26.8 maf., 104 percent of average, and about the same as last month's forecast. While portions of the basin received above-normal rainfall, precipitation was below normal over most of the basin during May. |