Clay Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Areal Flood Warning
Issued: 11:14 AM CDT Sep. 21, 2018 – National Weather Service

... A Flood Warning remains in effect until 1230 am CDT Saturday for
southwestern Lyon... Sioux... Clay... O'Brien... northern Clay...
Lincoln... Yankton... Turner... northern Union and Hutchinson
counties...

At 1113 am CDT, local law enforcement reported flooding across the
warned area. Many rural and County roads as well as a few state
highways remain under water.

Some locations that will experience flooding include...
Yankton, Spencer in Clay County, Sioux Center, Orange City, Sheldon,
Canton, Hawarden, Beresford, Parker, Harrisburg, Tea, Rock Valley,
Hull, Lennox, Hartley, Sanborn, Freeman, Alton, Paullina and
Primghar.

Precautionary/preparedness actions...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

Stay away or be swept away. River banks and culverts can become
unstable and unsafe.


Lat... Lon 4292 9495 4291 9764 4317 9764 4317 9787
      4350 9787 4347 9680 4325 9585 4322 9494
      4312 9492


Weisser


1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Little Sioux river at Spencer.
* Until further notice.
* At 09am Friday the stage was 16.57 feet.
* Major flooding is occurring and major flooding is forecast.
* Flood stage is 10.00 feet.
* Recent activity... the river rose above flood stage on Thursday
September 20.
* Forecast... the river will continue to fall to a stage of 14.6 feet
by 7 am Saturday.
* At stages near 16.5 feet... Highway 71 and Highway 18 begin to
flood, and West Park street, 1st street, and 2nd street in Spencer
are flooded. Some homes and businesses in the southern portions of
Spencer are also flooded.


Lat... Lon 4321 9528 4321 9517 4314 9503 4299 9503
          4302 9510 4310 9511 4314 9523




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Little Sioux river near Milford.
* Until further notice.
* At 09am Friday the stage was 15.71 feet.
* Moderate flooding is occurring and moderate flooding is forecast.
* Flood stage is 12.00 feet.
* Recent activity... the river rose above flood stage on Thursday
September 20.
* Forecast... the river will remain near 15.8 feet today, then begin
a slow fall.
* At stages near 16.0 feet... 170th Avenue south of Highway 9 is
flooded.


Lat... Lon 4341 9527 4341 9521 4334 9520 4331 9515
          4321 9517 4321 9528 4330 9525




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Ocheyedan river near Everly.
* Until further notice.
* At 10am Friday the stage was 1364.93 feet.
* Flood stage is 1364.00 feet.
* At stages near 1364 feet... ditches fill, the lowest banks overflow,
and minor flooding of agricultural land begins.


Lat... Lon 4324 9542 4324 9537 4318 9534 4317 9527
          4313 9529 4316 9539




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Ocheyedan river near Spencer.
* Until late Monday night.
* At 10am Friday the stage was 12.27 feet.
* Major flooding is occurring and major flooding is forecast.
* Flood stage is 8.00 feet.
* Forecast... the river will continue to fall to below flood stage by
Monday September 24.
* At stages near 12.5 feet... water reaches the bottom of the bridge
north of the Ocheyedan wma.


Lat... Lon 4313 9529 4317 9527 4314 9521 4314 9515
          4313 9515 4311 9520




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Little Sioux river at Linn Grove.
* Until further notice.
* At 10am Friday the stage was 22.71 feet.
* Major flooding is occurring and record flooding is forecast.
* Flood stage is 18.00 feet.
* Forecast... the river will continue rising to near 23.3 feet by
Saturday September 22.
* At stages near 20.0 feet... significant flooding of agricultual land begins
along the entire stretch of the river.


Lat... Lon 4302 9510 4299 9503 4287 9512 4288 9536
          4296 9543 4293 9520




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Willow Creek near Willow Creek near Cornell.
* Until further notice.
* At 09am Friday the stage was 91.69 feet.
* Flood stage is 90.00 feet.


Lat... Lon 4300 9521 4297 9512 4296 9512 4297 9520
          4298 9521




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.



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