Alert archive / Iowa / Flash Flood Warnings in 2017
Flash Flood Warning 1, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jun 29, 2017, 4:47 PM CDT for Plymouth County, Woodbury County, Iowa; Union County, South Dakota; Dakota County, Nebraska. It was in force for 3 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
- Jun 29, 2017, 4:47 PM CDT (21:47 UTC)
- Expired
- Jun 29, 2017, 7:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Plymouth County, IA, Woodbury County, IA, Dakota County, NE, Union County, SD
The radar
The Sioux Falls radar (KFSD), 128 km from the middle of the area, began a volume at 21:47 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, 9.8 hours before the alert went out and 129 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
- 712 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1324 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -19 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted.
957 WGUS53 KFSD 292147 FFWFSD IAC149-193-NEC043-SDC127-300045- /O.NEW.KFSD.FF.W.0001.170629T2147Z-170630T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Sioux Falls SD 447 PM CDT THU JUN 29 2017 The National Weather Service in Sioux Falls has issued a * Flash Flood Warning for... Northwestern Woodbury County in west central Iowa... South central Plymouth County in northwestern Iowa... Northeastern Dakota County in northeastern Nebraska... Southeastern Union County in southeastern South Dakota... * Until 745 PM CDT * At 447 PM CDT, Doppler radar indicated heavy rain across the warned area. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Sioux City, South Sioux City, Sergeant Bluff, North Sioux City, Dakota City, Lawton and Bronson. PRECAUTIONARY/PREPAREDNESS ACTIONS... Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other drainage areas and low lying spots. && LAT...LON 4260 9617 4234 9609 4234 9644 4253 9653 $$ Schumacher
1 follow-up statement
949 WGUS73 KFSD 300039 FFSFSD Flash Flood Statement National Weather Service Sioux Falls SD 739 PM CDT THU JUN 29 2017 IAC149-193-NEC043-SDC127-300049- /O.EXP.KFSD.FF.W.0001.000000T0000Z-170630T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Woodbury IA-Plymouth IA-Dakota NE-Union SD- 739 PM CDT THU JUN 29 2017 ...THE FLASH FLOOD WARNING FOR NORTHWESTERN WOODBURY...SOUTH CENTRAL PLYMOUTH...NORTHEASTERN DAKOTA AND SOUTHEASTERN UNION COUNTIES WILL EXPIRE AT 745 PM CDT... Flood waters have receded. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. LAT...LON 4260 9617 4234 9609 4234 9644 4253 9653 $$ Weisser
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 3:48 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 42 min |
| Jun 29, 4:08 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 52 min |
| Jun 29, 4:23 PM CDT | Tornado Warning | FSD | Woodbury | 37 min |
| Jun 29, 4:26 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 49 min |
| Jun 29, 4:46 PM CDT | Tornado Warning | FSD | Woodbury | 29 min |
| Jun 29, 4:54 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 51 min |
| Jun 29, 5:10 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 35 min |
| Jun 29, 5:29 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 33 min |
| Jun 29, 5:30 PM CDT | Tornado Warning | FSD | Woodbury | 30 min |
| Jun 29, 5:43 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 18 min |
| Jun 29, 5:59 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 22 min |
| Jun 29, 6:27 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 33 min |
| Jun 29, 3:22 PM CDT | Severe Thunderstorm Warning | FSD | Union | 53 min |
| Jun 29, 3:41 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Douglas | 34 min |
| Jun 29, 3:47 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Douglas | 28 min |
| Jun 29, 3:57 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Douglas | 33 min |
| Jun 29, 4:06 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Douglas | 24 min |
| Jun 29, 4:15 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix, Douglas, Hutchinson | 30 min |
| Jun 29, 4:16 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix | 29 min |
| Jun 29, 4:40 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix, Douglas, Hutchinson | 35 min |
| Jun 29, 5:01 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Hutchinson, Yankton | 29 min |
| Jun 29, 5:23 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Hutchinson, Turner, Yankton | 37 min |
| Jun 29, 5:39 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Turner, Yankton | 36 min |
| Jun 29, 6:03 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Union, Yankton | 27 min |
| Jun 29, 6:12 PM CDT | Tornado Warning | FSD | Union | 18 min |
Nearby
Flash Flood Warnings in Iowa, 2017Flash Flood Warnings in South Dakota, 2017Flash Flood Warnings in Nebraska, 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.