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Posts Tagged ‘minot flooding’

Souris River Tops 1881 Historic Flood Level

Posted by feww on June 25, 2011

Minot Drowning as Souris River sinks 130-year flood record, more rain forecast for Missouri Basin

The river is still climbing and it forecast to crest at 1,564 feet above sea level by late Saturday.

Entire streets are under up to 8 feet of water, and the floodwaters continue to rise.

More then 12,000 of the city’s 41,000 residents are under evacuation orders.

“It’s dangerous and we need you to stay away and do as little travel as possible within the community,” Minot Mayor said.

At least 2,500 homes had been flooded by Friday afternoon, and the number could grow to 5,000 homes by late Friday, the mayor added.

“Even though we are still frantically fighting the flood and trying to keep the water away still as much as possible, we are very rapidly going to be into a period where we are dealing with the human impacts of this,” North Dakota Governor said, as shelters and temporary housing began running out of space.

About a third of the homes in the small town of Burlington (Pop: 1,075) are expected to be lost.

Hydrograph for Souris River at Minot-Broadway Bridge. Source: NWS/AHPS

Flood Categories and Historical Crests

More hydrographs: Souris and Des Lacs Flood Briefing Page

HPC 5-Day Precipitation Forecast Map.

Canadian reservoirs over capacity

“Heavy rains across the Souris River Basin left Canadian reservoirs over capacity. Water then rushing down from Canada has forced U.S. officials to make record-large releases from the Lake Darling Dam above Minot and other communities,” a report said.

The reservoirs won’t be able to cope with the additional rain forecast for the region and ecord releases would be needed causing widespread floodings in Nebraska, Iowa and Missouri through mid-August.

US Weather Threats Assessment Map

Map of potential hazards related to climate, weather and hydrological events in the U.S.  Source: NWS/CPC. Click image to enlarge.

US Weather Map 24-25 June

Click image to enlarge.

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2011 Disasters

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Minot Flood Warning

Posted by feww on June 24, 2011

Souris River Flooding

Water is moving twice as fast as past floods

At least 10,000 residents have already evacuated from at-risk parts of Minot, North Dakota, according to  reports.

Hydrograph for Souris River at Minot-Broadway Bridge
. Source: NWS/AHPS

Flood Categories and Historical Crests

Water is moving about twice as fast through the system as past flood  event. For example, in 1969 it took about 5 days for the water to route from Estevan to Sherwood but this year it is taking about 2.5 days.  Aerial reconnaissance indicates that from Estevan to Minot the valley is full of water from bluff to bluff enabling the flood wave to move more quickly as it bypasses the normal channel and the normal channel and off channel obstacles.  This flood is over twice as large in terms of peak flow than the previous records all along the Souris River, and this creates uncertainty with eventual peak values. (Source: NWS)

Missouri basin reservoirs from eastern Montana t0 the Dakotas are approaching their capacity. “Reservoir water release rates are expected to stay at high release levels (150,000 cfs) into August. These extremely high flows, combined with normal rainfall, will result in near-record flooding along portions of the Missouri River.” NWS said.

Map of the Missouri River. The Missouri River begins in southern Montana in the Rocky Mountains, first flowing north then generally southeast across the heart of the United States, ending at the Mississippi River, just to the north of St. Louis, Missouri. Some 4,023 km (2,500 miles) long, it is the longest river in the United States. Source: NWS CRH

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