Minnehaha Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Flood Warning
Issued: 11:06 AM CDT Sep. 21, 2018 – National Weather Service

The Flood Warning continues for
the skunk creek at Sioux Falls.
* Until Saturday afternoon.
* At 09am Friday the stage was 11.82 feet.
* Flood stage is 11.50 feet.
* Forecast... the river will continue to fall to below flood stage by
Friday September 21.
* At stages near 11.5 feet... minor flooding of rural agricultural
land begins, along with some flooding in the Parks in Sioux Falls.


Lat... Lon 4361 9693 4361 9684 4355 9678 4352 9678
          4354 9684 4356 9691




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Willow Creek near Crooks.
* Until further notice.
* At 10am Friday the stage was 10.36 feet.
* Flood stage is 9.00 feet.
* At stages near 11.0 feet... the higher banks overflow flooding
significant amounts of pasture land and some crop land.


Lat... Lon 4370 9685 4370 9683 4364 9681 4359 9681
          4361 9684 4369 9688




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Split Rock creek near Corson.
* Until Sunday afternoon.
* At 09am Friday the stage was 12.10 feet.
* Moderate flooding is occurring and moderate flooding is forecast.
* Flood stage is 8.50 feet.
* Forecast... the river will rise to 12.5 feet by Friday September 21.
* At stages near 14.0 feet... Highway 11 north of Corson begins to
flood.


Lat... Lon 4372 9654 4372 9648 4362 9654 4358 9654
          4358 9661 4365 9661




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Split Rock creek below Jasper.
* Until further notice.
* At 09am Friday the stage was 95.15 feet.
* Flood stage is 91.00 feet.
* At stages near 96.0 feet... the higher banks on this stretch of the
creek are overtopped.


Lat... Lon 4390 9639 4384 9637 4377 9642 4372 9648
          4372 9654 4381 9649




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Big Sioux River at Brandon.
* Until further notice.
* At 10am Friday the stage was 1207.03 feet.
* Flood stage is 1204.00 feet.
* At 1204 feet, significant flooding of crop and pasture land begins.
Access to the north end of the big Sioux Recreation Area on the west
side of Brandon is limited.


Lat... Lon 4359 9665 4362 9664 4360 9657 4345 9656
          4338 9646 4339 9658 4343 9662 4358 9662




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Big Sioux River at Sioux Falls north cliff.
* Until Sunday afternoon.
* At 09am Friday the stage was 16.02 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Flood stage is 16.00 feet.
* Recent activity... the river rose above flood stage on Friday
September 21.
* Forecast... the river will rise to 16.8 feet by Saturday September
22.
* At stages near 17.5 feet... 60th street north and timberline Road
begin to flood.


Lat... Lon 4356 9672 4358 9672 4358 9668 4359 9668
          4362 9664 4359 9665 4356 9667




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Big Sioux River at Sioux Falls western Avenue.
* Until further notice.
* At 10am Friday the stage was 11.51 feet.
* Flood stage is 8.00 feet.
* At stages near 10.0 feet... city Parks in southern Sioux Falls begin to
have significant flooding.


Lat... Lon 4352 9678 4353 9676 4350 9675 4352 9671
          4353 9670 4355 9673 4357 9672 4356 9672
          4355 9672 4353 9669 4352 9669 4349 9675
          4350 9676




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Big Sioux River below Dell Rapids.
* From this evening to Sunday morning.
* At 09am Friday the stage was 9.57 feet.
* Minor flooding is forecast.
* Flood stage is 12.00 feet.
* At stages near 12.0 feet... agricultural lands along the lower banks
of the river begin to flood.


Lat... Lon 4382 9674 4381 9672 4369 9671 4369 9676
          4373 9678 4379 9676




Public Information Statement
Issued: 2:37 PM CDT Sep. 21, 2018 – National Weather Service


... NWS damage survey for Superior Iowa tornado - update 1... .

.Tornado number 1 near Superior Iowa...

Rating: EF-1
estimated peak wind: 99 mph
path length: estimated at 1 mile
path width: 25 yards
fatalities: 0
injuries: 0

Start date: September 20 2018
start time: 5:22 PM CDT
start location: west of Superior, Iowa

End date: September 20 2018
end time: 5:24 PM CDT
end location: east of Superior, Iowa

survey summary: observational equipment near Superior ethanol
directly measured 99 mph as tornado moved through. Assistance was provided
by the Dickinson County emergency management office with photos and aerial photo
assistance.

Ef scale: the Enhanced Fujita scale classifies
tornadoes into the following categories.

EF0... weak... ... 65 to 85 mph
EF1... weak... ... 86 to 110 mph
EF2... strong... .111 to 135 mph
EF3... strong... .136 to 165 mph
EF4... violent... 166 to 200 mph
EF5... violent... >200 mph

Note:
the information in this statement is preliminary and subject to
change pending final review of the event and publication in
NWS storm data.


237 PM CDT Fri Sep 21 2018


... NWS damage survey for Superior Iowa tornado - update 1... .

.Tornado number 1 near Superior Iowa...

Rating: EF-1
estimated peak wind: 99 mph
path length: estimated at 1 mile
path width: 25 yards
fatalities: 0
injuries: 0

Start date: September 20 2018
start time: 5:22 PM CDT
start location: west of Superior, Iowa

End date: September 20 2018
end time: 5:24 PM CDT
end location: east of Superior, Iowa

survey summary: observational equipment near Superior ethanol
directly measured 99 mph as tornado moved through. Assistance was provided
by the Dickinson County emergency management office with photos and aerial photo
assistance.

Ef scale: the Enhanced Fujita scale classifies
tornadoes into the following categories.

EF0... weak... ... 65 to 85 mph
EF1... weak... ... 86 to 110 mph
EF2... strong... .111 to 135 mph
EF3... strong... .136 to 165 mph
EF4... violent... 166 to 200 mph
EF5... violent... >200 mph

Note:
the information in this statement is preliminary and subject to
change pending final review of the event and publication in
NWS storm data.