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FLOOD09998
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Last modified
1/26/2010 10:11:26 AM
Creation date
10/5/2006 4:48:12 AM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Annual Report-1998 Tributary Reservoir Regulation Activities
Date
12/1/1998
Prepared For
Missouri River Division
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />occurred along the Missouri River, from Brownville, Nebraska, downstream as the <br />additional runoff caused the river, already high from above average mainstem dam <br />releases, to overflow by September 27th. Releases for the three downstream <br />reservoirs were as follows on October 1 st: <br /> <br />Big Bend (Lake Sharpe) <br />Ft. Randall (Lake Francis Case) <br />Gavins Point (Lewis & Clark Lake) <br /> <br />52,000 cfs <br />64,000 cfs <br />68,000 cfs <br /> <br />Another storm moved through the District on October 11'" and 12th, <br />producing snow at higher elevations of the Black Hills and rains of 1.5 to 2.5 <br />inches across parts of central Nebraska, western Iowa and South Dakota. As <br />tributary streams emptied their runoff the Missouri River at Brownville pushed <br />above flood stage again. The Missouri River at Williston, North Dakota, finally fell <br />below flood stage by mid-October. <br /> <br />: <br /> <br />Winter weather roared into the southeastern part of the District with a <br />vengeance by October 25th. Blizzard conditions developed as warm moist air from <br />the Gulf of Mexico was fed into a deepening low-pressure system tracking <br />northeastward from Colorado towards Iowa. Precipitation began as moderate to <br />heavy rain, then changed to snow. Thunderstorms with heavy snow produced a <br />band of heavy snow from 1 to 2 feet deep from central Nebraska into western <br />Iowa, damaging or destroying many trees, which still had fall foliage. Lincoln, <br />Nebraska, had among the heaviest precipitation from the storm with 3.31 inches <br />reported on October 26th, which included 14 inches of snow. Temperatures behind <br />the blizzard plunged to below zero readings in the Nebraska panhandle and eastern <br />Wyoming to low teens in the eastern part of Nebraska, breaking many low <br />temperature records, Runoff from the rain ahead of the blizzard and snowmelt, <br />once again pushed the Missouri River at Brownville and Rulo 1 to 2 feet above <br />flood stage by October 28th. <br /> <br />Following the blizzard, mild and dry weather returned to the District until <br />November 12th, when another snowstorm moved out of the northern Rockies and <br />across the Dakotas dropping 2 to 6 inches of snow on the plains and larger <br />amounts in the mountains, More rain and snow moved in by November 28'". By <br />December 1st, the Missouri River again rose above flood stage from Nebraska City, <br />Nebraska, downstream and the lower Nishnabotna River experienced high within- <br />bank stages near Hamburg, Iowa. A normal late fall or early winter weather pattern <br />prevailed through mid-December, with many areas receiving light to moderate snow <br />with the passage of fronts and storm systems. Much of that snow melted by <br />Christmas as unusually warm and dry weather spread across the District. The mild <br />conditions were attributed to the EI Nino weather phenomenon in the Pacific Ocean. <br /> <br />~ <br /> <br />~ <br /> <br />10 <br />
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