Alert archive / Nebraska / Flash Flood Warnings in 2017
Flash Flood Warning 6, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Aug 25, 2017, 12:07 PM CDT for Dakota County, Dixon County, Nebraska; Union County, South Dakota. It was in force for 113 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 25, 2017, 12:07 PM CDT (17:07 UTC)
- Expired
- Aug 25, 2017, 2:00 PM CDT
- In force
- 113 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Dakota County, NE, Dixon County, NE, Union County, SD
The radar
The Sioux Falls radar (KFSD), 109 km from the middle of the area, began a volume at 17:09 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
Aberdeen, SD (KABR), launched 12:00Z, 5.1 hours before the alert went out and 288 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 742 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
510 WGUS53 KFSD 251707 FFWFSD NEC043-051-SDC127-251900- /O.NEW.KFSD.FF.W.0006.170825T1707Z-170825T1900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Sioux Falls SD 1207 PM CDT FRI AUG 25 2017 The National Weather Service in Sioux Falls has issued a * Flash Flood Warning for... Northwestern Dakota County in northeastern Nebraska... Central Dixon County in northeastern Nebraska... Southwestern Union County in southeastern South Dakota... * Until 200 PM CDT * At 1206 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. One to two inches of rain have already fallen. Flash flooding is expected to begin shortly. Additional rainfall amounts of one to three 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 4270 9662 4247 9650 4249 9691 4270 9691 $$ Gillispie
1 follow-up statement
138 WGUS73 KFSD 251825 FFSFSD Flash Flood Statement National Weather Service Sioux Falls SD 125 PM CDT FRI AUG 25 2017 NEC043-051-SDC127-251834- /O.CAN.KFSD.FF.W.0006.000000T0000Z-170825T1900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dakota NE-Dixon NE-Union SD- 125 PM CDT FRI AUG 25 2017 ...THE FLASH FLOOD WARNING FOR NORTHWESTERN DAKOTA...CENTRAL DIXON AND SOUTHWESTERN UNION COUNTIES IS CANCELLED... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. LAT...LON 4270 9662 4247 9650 4249 9691 4270 9691 $$ Gillispie
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 11:08 AM CDT | Flash Flood Warning | FSD | Dakota, Dixon | 112 min |
| Aug 25, 5:32 PM CDT | Severe Thunderstorm Warning | FSD | Brule | 58 min |
| Aug 25, 5:42 PM CDT | Severe Thunderstorm Warning | FSD | Brule, Charles Mix, Gregory | 63 min |
| Aug 25, 6:36 PM CDT | Severe Thunderstorm Warning | FSD | Beadle, Kingsbury, Miner, Sanborn | 39 min |
| Aug 25, 6:48 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Davison, Jerauld, Sanborn | 57 min |
Nearby
Flash Flood Warnings in Nebraska, 2017Flash Flood Warnings in South Dakota, 2017Every flash flood warning in 2017
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.