Alert archive / Nebraska / Flash Flood Warnings in 2018
Flash Flood Warning 37, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Sep 18, 2018, 10:48 AM CDT for Dakota County, Dixon County, Nebraska; Woodbury County, Iowa. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2018, 10:48 AM CDT (15:48 UTC)
- Expired
- Sep 18, 2018, 12:58 PM CDT
- In force
- 2 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Woodbury County, IA, Dakota County, NE, Dixon County, NE
The radar
The Omaha radar (KOAX), 107 km from the middle of the area, began a volume at 15:51 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 3.8 hours before the alert went out and 107 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1380 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 1445 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- -25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
853
WGUS53 KFSD 181548
FFWFSD
IAC193-NEC043-051-181845-
/O.NEW.KFSD.FF.W.0037.180918T1548Z-180918T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
1048 AM CDT TUE SEP 18 2018
The National Weather Service in Sioux Falls has issued a
* Flash Flood Warning for...
Southwestern Woodbury County in west central Iowa...
Southern Dakota County in northeastern Nebraska...
South central Dixon County in northeastern Nebraska...
* Until 145 PM CDT.
* At 1046 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to three inches of rain have
already fallen. Flash flooding is expected to begin shortly.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 4223 9633 4225 9633 4228 9635 4228 9672
4227 9673 4227 9687 4236 9687 4245 9620
4221 9621 4222 9634
$$
Gillispie1 follow-up statement
430
WGUS73 KFSD 181758
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
1258 PM CDT TUE SEP 18 2018
IAC193-NEC043-051-181806-
/O.CAN.KFSD.FF.W.0037.000000T0000Z-180918T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Woodbury IA-Dakota NE-Dixon NE-
1258 PM CDT TUE SEP 18 2018
...THE FLASH FLOOD WARNING FOR SOUTHWESTERN WOODBURY...SOUTHERN
DAKOTA AND SOUTH CENTRAL DIXON COUNTIES IS CANCELLED...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 4223 9633 4225 9633 4228 9635 4228 9672
4227 9673 4227 9687 4236 9687 4245 9620
4221 9621 4222 9634
$$
GillispieNearby
Flash Flood Warnings in Nebraska, 2018Flash Flood Warnings in Iowa, 2018Every flash flood warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.