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 Vermillion river near Vermillion.
* From late Saturday night to Friday September 28.
* At 09am Friday the stage was 13.13 feet.
* Moderate flooding is forecast.
* Flood stage is 21.00 feet.
* Forecast... the river will rise to 26.7 feet by Monday September 24.
* At stages near 26.0 feet... the bridge on north Crawford Avenue
northeast of the gauge is overtopped


lat... Lon 4291 9701 4291 9690 4285 9686 4278 9689
          4273 9684 4274 9696




1106 am CDT Fri Sep 21 2018

The Flood Warning continues for
the Vermillion river near Wakonda.
* Until Thursday afternoon.
* At 08am Friday the stage was 13.42 feet.
* Major flooding is forecast.
* Flood stage is 14.00 feet.
* Forecast... the river will rise to 17.2 feet by Monday September 24.
* At stages near 17.0 feet... Highway 19 south of Centerville is
flooded. Water reaches the bottom of the bridge on 302nd street east
of Colfax Corner, and many of the levees will start to be overtopped
with approximately 25000 acres flooded between Davis and Vermillion.


Lat... Lon 4310 9703 4310 9694 4291 9690 4291 9701
          4295 9700 4300 9704




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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