Past IEM Features tagged: flood

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Cedar Rapids Flooding

27 Sep 2016 05:15 AM
The big story in the state is the ongoing flooding of the Cedar River in Cedar Rapids. This flooding water is from rainfall last week over northeastern Iowa. The featured chart displays sequential river stage forecasts for the CIDI4 (Cedar River at Cedar Rapids) site. Forecasts are made out a number of days and updated a few times per day during active flow situations. The plot presents each of these forecasts and the observed data for the site. Thankfully the forecasted crests have slowly crept lower with time as the event has gotten closer to town.

Good: 9
Bad: 0
Abstain: 1

Tags:   flood  

More Northeast Iowa Flooding

23 Sep 2016 05:34 AM
The featured map displays MRMS precipitation estimates from noon Tuesday thru noon Thursday for NE Iowa, SW Wisconsin, and SE Minnesota. Amazingly, three different areas are estimated to have received over 10 inches during this period. The heaviest rainfall in Iowa fell near Greene with an actual report of over 10 inches to match the estimates. Sadly, more rain fell in the area overnight and more chances of rainfall are in the forecast for this weekend.

Good: 22
Bad: 0

Tags:   flood  

Turkey River Flooding

26 Aug 2016 05:34 AM
The large rainfall shown in yesterday's IEM Daily Feature resulted in significant flooding. The featured chart today looks at the stage reports from river gauges along the Turkey River in far NE Iowa. The right hand panel shows that the significant rainfall was isolated to the upper portions of the basin with locations to the SE receiving less than an inch. So the surge of water from the rainfall event can be tracked as it flows downstream. The six gauges shown are spatially plotted on the right hand panel with the Spillville location representing the 'start' of the river rise for this analysis. The time when the rise begins (defined in this context to be a 10% jump in stage) is then computed and compared back to the Spillville time. A speed is also calculated based on the distance traveled over that time. So at a rate of about 3 mph, the river rise flowed its way SE impacting places like Elkader and Garber some 12-18 hours later.

Good: 23
Bad: 2

Tags:   flood   turkey   river  

Duluth Flood Event

23 Jun 2012 09:21 AM
A significant flood event impacted areas in and around Duluth, Minnesota this past week due to heavy rainfall over a multi-day period. The feature chart presents the one-minute interval precipitation observations from the Duluth ASOS sensor. Total precipitation for this event was nearly seven inches at this site. This rainfall caused record river heights in the area and significant damage.

Good: 71
Bad: 14

Tags:   flood  

Prolonged Flood Event

01 Sep 2011 05:52 AM
One of the big stories this year has been the flooding along the Missouri River. The featured chart presents the river stage observation from one of the automated sites near Sioux City. The river was in moderate flood stage for over 2 months! Among other things, this did a tremendous amount of damage to some the highways and interstates in the area which will require complete reconstruction.

Good: 20
Bad: 3

Tags:   2011   flood  

Not quite 1993 for the Squaw

12 Aug 2010 07:01 AM
Squaw Creek in Ames approached record levels seen back in 1993 yesterday, but came up a few inches short (18.13" versus 18.5"). The Squaw is the western river in Ames and affects the Iowa State University Campus. Many of you probably saw the water in Hilton Coliseum, that was from the Squaw. The featured image presents a comparison between 1993 and 2010 for the river gauge near Lincoln Way in Ames. With heavy rainfall expected on Friday night, it will be interesting to see how the secondary bump in river flow compares with 1993.

Good: 35
Bad: 2

Tags:   flood   squaw  

Surpassing 1993

11 Aug 2010 07:13 AM
The featured graph is from the National Weather Service website showing the forecasted crest for the Squaw Creek in Ames to exceed levels seen in 1993!

Good: 32
Bad: 12

Tags:   flood  

About three times average

16 Jun 2010 06:05 AM
Southern Iowa has certainly seen the worst of the heavy rainfall so far this summer. The featured chart is for the Lamoni ASOS since the first of May showing a total of over 18 inches of rain while the average accumulation for the period is only 6 some inches. Could a completely dry day finally be in store today? Regardless, more chances of thunderstorms, some of them severe, are back in the forecast for Thursday and Friday.

Good: 29
Bad: 6

Tags:   flood  

The featured image and calculation is courtesy of ISU grad student, Logan Karsten.

Plenty of supply

26 Feb 2010 06:17 AM
The featured map displays NOAA modeled snow water equivalent (the depth of liquid water present in the snow pack) for the Des Moines River Basin (red outline) upstream of Saylorville Lake. A crude GIS calculation indicates that there is enough frozen water in the basin to fill Saylorville Lake 2.5 times! Of course, not all of this water will make it downstream into the reservoir, but we will have to be fairly lucky to melt all of this snow without significant flooding. The worst case scenario would be for a heavy rainfall event on top of this extensive snow pack. There is about 550 billion gallons of frozen supply upstream of a reservoir that holds 221 billion gallons.

Good: 66
Bad: 23

Tags:   flood   swe  

Hydrograph for AESI4

Ames Flooding

02 Jun 2008 07:33 AM
The featured hydrograph was taken from the NWS website showing the South Skunk river coming within a foot of setting a record stage. The current river stage is back below flooding levels, but more heavy rainfall is expected this week. Soils are currently saturated and rainfall will quickly runoff causing flooding once again.

Good: 23
Bad: 5

Tags:   flood